Submitted by jarvedttudd t3_zvvjh2 in space
Comments
[deleted] t1_j1rwlqx wrote
[removed]
Tired8281 t1_j1rz73u wrote
He seems cool, but tell me more about the missing satellite.
mtechgroup t1_j1rzxml wrote
Now find the one that was mysteriously lost after SpaceX deployed it a couple of years ago.
LogicalExtension t1_j1s0eup wrote
Looks like there hasn't been much progress - https://en.wikipedia.org/wiki/IMAGE_(spacecraft)#Recovery_efforts
Current_Individual47 t1_j1s23c4 wrote
Which one is that?
mtechgroup t1_j1s2gip wrote
Zuma, but ICON is another one I think.
Tired8281 t1_j1s2oas wrote
Thanks! Seems wild to me that they could just lose a satellite. Aren't they like a million dollars?
Thieman15 t1_j1s34wh wrote
Depends on what it is. Some are well into 9 figures and beyond
sbhansf t1_j1s36pq wrote
The video says that is what he was originally looking for.
bubblesculptor t1_j1s46i9 wrote
His twitter is interesting, posts lots of signal visualizations, images etc that he observes from his home satellite dishes etc. Lots of the older satellites have unencrypted transmissions that can be picked up & interpreted.
CreepyValuable t1_j1s48e1 wrote
Is this the one that was lost because the U. S. was using freedom units and everyone else was using metric?
LogicalExtension t1_j1s4aqd wrote
Lost as in "lost contact", not like they dropped it down the back of the couch and couldn't find it.
Equipment fails, so it's fairly normal.
e: Also, as for the price -- well more than a million, try about $132 million. "Costs for IMAGE are estimated at US$132 million, including the spacecraft, instruments, launch vehicle, and ground operations."
[deleted] t1_j1s4fwf wrote
[deleted]
WorldsBestArtist t1_j1s6832 wrote
Isn't that the one that people say wasn't really lost, but rather the US military wants other nations to believe it's lost? I seem to recall SpaceX disputing that it was ever lost, and then the story just mysteriously disappeared from major news outlets.
jorbleshi_kadeshi t1_j1s6ffx wrote
I'm just picturing some astronomer out on the NASA front lawn wildly swinging around a little telescope and mumbling "I just know we put it up here somewhere!"
[deleted] t1_j1s7zs0 wrote
namek0 t1_j1s8fxs wrote
https://www.simscale.com/blog/nasa-mars-climate-orbiter-metric/
the acceleration readings measured in English units of pound-seconds^2 for a metric measure of force called newton-seconds^2
So not miles instead of kilometers bad but still pretty bad lol
Just__Let__Go t1_j1s8ujd wrote
Lost a satellite, NASA has? How embarrassing!
[deleted] t1_j1s8xmm wrote
[removed]
putsonall t1_j1saj6q wrote
Basically spacex said their piece went perfectly, but Zuma didn't properly do its part after separation and it fell back through the atmosphere. According to reports.
WilliedeFoe t1_j1sbd0m wrote
He found the needle in the haystack! Out of the hundreds, if not thousands, of satellites in orbit! Very Sci-fi 👏. I'm glad he did...I wonder if he knows how many fall down a year.
Clawsickle t1_j1sbodg wrote
You wonder how Musk got rich, he got billions for this mystery craft.
92894952620273749383 t1_j1sc0mj wrote
What is the significance of an eclipse?
2wheels30 t1_j1sd4ij wrote
Most of his wealth came from ownership in Tesla and the massive rise in share price, not from a lost SpaceX satellite. Now he did utilize a ton of government grant money and government backed loans (ultimately forgiven) to get Tesla off the ground, and you could say that his manipulation of the market around Tesla (and other things) was wrong, but this satellite is small potatoes.
darkwalrus25 t1_j1sdbdd wrote
Northrop Grumman designed and built the satellite and purchased and tested the payload adapter (that was the likely point of failure) and charged the billions of dollars. All SpaceX did was launch it, and they claim the rocket performed how it should have.
Laserdollarz t1_j1sdf7v wrote
The temporary drop in voltage from the solar panels might be enough to turn the satellite off and on again.
Ferniclestix t1_j1sdkfw wrote
have you checked behind hubble, your always leaving stuff there?.
[deleted] t1_j1sdxti wrote
spunkyenigma t1_j1se0o3 wrote
The ultimate watchdog timer
[deleted] t1_j1segnp wrote
Laserdollarz t1_j1seqe1 wrote
I feel like NASA called up a retired engineer while he was in the middle of golf or something and he just said "Idfk, have you tried turning it off and back on again?" before hanging up.
mustang__1 t1_j1sfyr3 wrote
Andre.... You lost abote satellite.....
hugo-s t1_j1sg4yx wrote
The US actually uses metric. All of the imperial units are defined off of metric.
LogicalExtension t1_j1sgqoa wrote
"Honey, have you seen the IMAGE Satellite?"
"No, Dear, where did you leave it last?"
LogicalExtension t1_j1sh3fo wrote
Solar Eclipse = no sun.
Solar Flare = more sun.
[deleted] t1_j1sictz wrote
LogicalExtension t1_j1sided wrote
The "I'm not a satellite engineer, I don't even play one on TV" explanation is:
Most satellites get their power from solar panels. Depending on their orbit, they might be in earth's shadow for part of their orbit. During that time, they'll need to run off batteries. Batteries have a limited capacity, and their capacity degrades over time. You design the satellite to only have the amount of capacity you think you'll need, and a little extra margin.
Satellites have management computers, with various levels of self-monitoring/recovery. Normally if something goes wrong, the self-monitoring will be able to detect this, and either "reboot" automatically, or go into a recovery mode where the ground-team can send up commands to diagnose and reprogram it.
However something went really wrong with this satellite and that system wasn't working.
The significance of the eclipse is that this would be a longer time the satellite was in shadow, and so the batteries might run down to the point where the satellite switches off entirely. Then, when the satellite is back out of the earth's shadow, the satellite will switch back on when it gets power back.
This would, hopefully, make the onboard computers go into a recovery mode, allowing that diagnostics/reprogramming.
It's sort of an extreme version of "Have you tried turning it off and back on again?".
Commies4Lyfe t1_j1sif4f wrote
Genuine question. Do NASA just give really poor life expectancies to their stuff? I feel like I always see that they say something eill only last for so long, bit then it just carries on.
skucera t1_j1sjzx0 wrote
It’s a worst-case scenario estimate. If the worst-case scenario still justifies the cost, then the project is worth moving forward with trying to get prioritized into the budget. Of course, they buy the absolute best (highest-reliability) gear, and have some of the most sophisticated failure analysis and prevention tools in the world, which contributes to extended longevity.
Basically, it’s better to under-promise and over-deliver, especially when you’re the part of the government that has to really struggle for funding.
SquarePegRoundWorld t1_j1sk1yq wrote
I think it is more about how much money are they gonna ask congress for. Probably harder to secure more money for longer missions and easier to ask for extensions on "shorter" missions that are working well.
coriolis7 t1_j1skhk9 wrote
They design everything to have an extremely high chance of surviving the mission life at full operational capability. If they design each system to have a 50% chance of surviving 2 years, and there are 5 systems, then there’s only a 3% chance the mission will actually make it to 2 years.
Even then, if NASA wants 2 full years, then they’ll shoot for a high likelihood of meeting it, like 95+%. That means there’s a decent chance it’ll make it well past 2 years.
Shabbona1 t1_j1sl445 wrote
So 1) space is super hostile. Not an ideal environment to operate anything in.
- everything eventually needs maintenance and it's basically impossible to perform maintenance on satellites so think how long a complex device would function on earth without anybody touching it ever again.
Both of the above lead to 3) they engineer the living shit out of those things, and damn near everything has a "safety factor." Which, in short, means they take whatever they think the operating threshold is for a component and divide it by 2 at the very least when doing their math on what they think the component can withstand for any given attribute. This is a common thing in almost every product developed. Ever see a ladder that says rated for 250 lbs? Odds are it won't fail until you put 500-750lbs on it. But nobody says that number because you can't guarantee it won't fail just before 500 and you don't want a user to find out, so you say 250lbs.
What this means is NASA guarantees the satellite will run for 2 years, but it will likely run for longer than that. Plus, every good engineer operates under the rule of "under promise, over deliver." Tell your superiors it will definitely last for 2yrs, engineer it with safety factors to guarantee 2 years, and then over deliver when it ends up lasting for 2.5, or 3, or in this case, 5.
11thDimensionalRandy t1_j1sl5n5 wrote
They generally give lower end estimates.
If you followed along the JWST launch, it was often said that it went so well that it extended the length of the mission, but ehat happened is that the Ariane rocket performed perfectly within instead of its expected capabilities and no fuel had to be wasted on correcting mistakes, leaving more fuel for the satellite to make the adjustments required to remain fully operational at L2.
NASA suffers from a lot of restrictions, and failures are valued a lot more than successes, so rather than claiming the JWST can operate for 20 years, having something happen to cut that number down to 15 years and dooming the agency after a huge project underdelivered, they work with lower expectations.
SuddenlyLucid t1_j1slgc6 wrote
But we're not used to it, because almost everyone else does the opposite, NASA is pretty unique in that regard.
ClamatoDiver t1_j1smgt8 wrote
They pull a Scotty.
Cap'n I canna give ye the engines for 4 hours!
Twenty minutes later the engines are working.
dultas t1_j1smoby wrote
Not imperial, US customary units, that's why thing like pint, oz, and tablespoon differ in the US vs UK.
[deleted] t1_j1sn0si wrote
[removed]
[deleted] t1_j1socjo wrote
Talonczar t1_j1sordz wrote
Some factors that cause normal wear and tear can be mapped out and predicted and are well established in the world of engineering. Things like thermal stresses, temperature cycling, battery charge cycles, etc.
One of the big challenges with space is that there is a bunch of stuff whizzing around that really can't be predicted for, and could cause major damage, or significant damage to localized areas. This would be things like space debris that's below the scale that nasa tracks, or that doesn't return radar signatures. Cosmic rays are like atom sized rail gun slugs that can cause serious damage to electrical systems and circuitry. For stuff like this, you have to work off what you know, and the outliers can be way off a normal distribution curve that you would expect for projected lifespan.
noncongruent t1_j1spryo wrote
> government backed loans (ultimately forgiven)
Minor correction, those loans weren't forgiven, they were paid back a decade early, with a prepayment penalty:
https://www.teslarati.com/tesla-doe-loan-early-repayment-penalty-elon-musk/
Tesla wasn't the only company to get loans from the DOE program created by Bush intended to help kick start certain technologies in this country.
2wheels30 t1_j1sqawx wrote
My bad, I thought some of the title 17 loans were forgiven. I'm happy for any group that is eligible to use them. Rather that money go towards clean(er) tech than our inflated defense budget.
OtisTetraxReigns t1_j1sr1oh wrote
Under promise, over-engineer.
TheDorkNite1 t1_j1sr2pg wrote
>Do NASA just give really poor life expectancies to their stuff?
It's fascinating to see how long some of their projects go past their dates. Opportunity rover lasted more than 14 years when it was planned for only 3 months.
Right now on Mars the little Ingenuity chopper is still kicking more than a year past its goals of 5 flights.
[deleted] t1_j1suw7q wrote
[removed]
[deleted] t1_j1sw6j8 wrote
[deleted] t1_j1sxaz1 wrote
[removed]
kc2syk t1_j1sxli5 wrote
If anyone is interested in listening to satellites and transmitting to amateur satellites, check out /r/amateursatellites and /r/amateurradio.
[deleted] t1_j1sya83 wrote
[removed]
MrTagnan t1_j1synop wrote
That one is long gone. Burnt up in the Martian atmosphere. NASA also used Metric, but the supplier for some of the components used imperial for their onboard computers
EdwardOfGreene t1_j1sz44e wrote
How much is a pint in the UK?
Do I get more or less beer in a pint? I need to know!
suicidaleggroll t1_j1sz4pv wrote
There’s a big difference between “we believe this system will last about 2 years”, and “this system has been designed so that it WILL last at least 2 years”
doobie042 t1_j1sz9b5 wrote
I just wish my appliances were like that.... They don't last more than a year or two these days without hefty repair bills.
sigmund14 t1_j1t0dbk wrote
I wish everyone would do the same as NASA. It wouldn't really be profitable, but the brand loyalty would be through the roof.
Instead, we have planned obsolescence - deliberate failure of some component that is impossible to replace / repair. Creating trash just for profits.
dultas t1_j1t0q3a wrote
Imperial pint is about 20% more than a US pint I believe.
EdwardOfGreene t1_j1t1knz wrote
Fuck! Now I have to move. I was happy here, but knowing this I will never again be content with 16 oz pints.
Looking into where I can find half assed affordable housing. Maybe Wales.
[deleted] t1_j1t1xyp wrote
[removed]
boredcircuits t1_j1t2mx2 wrote
It's not a "life expectancy." A better term is "minimum requirement." Basically, they tell the contractors that everything needs to last at least X years, and everything is designed around that. Fuel tanks, redundancies, etc.
Compare this to a consumer device, where the specifications might have an average life requirement. For example, a phone manufacturer might specify a battery that degrades 20% after 400 charge cycles. What they care about is the average: some will live longer than that, and some will be less. That's ok because they'll just warrantee the bad batteries.
But you usually can't just say "oops, sorry" and replace a faulty battery in something that goes to space. (Hubble's mirror being the notable exception.) So NASA requires everything to satisfy the minimum mission requirements. We shouldn't be surprised when something outlives the minimum, really.
Also, NASA has a knack for extending missions as hardware fails. Finding unplanned uses for mostly-operational hardware. Look up Kepler for a great example.
Fernelz t1_j1t2ngg wrote
They're built to last and with high quality.
The 2 years of mission time just means a 99% chance to be fully functional for the full 2 years. After that it's just a matter of individual parts failing until full contact loss. So after 2 years it can still do everything it could at launch but at year 4 it's still doing some stuff just maybe not everything.
The whole 2 year but really 5 year thing is also very helpful for funding. It looks good if they can say "yeah the last mission you paid for was a 2 year mission that lasted 5"
PS: this is just my understanding of it, please correct me if I'm wrong
phaser_on_overload t1_j1t2ug1 wrote
How else can he keep his reputation as a miracle worker?
ballrus_walsack t1_j1t3uuy wrote
I always buy NASA branded electronics.
za419 t1_j1t4kek wrote
NASA gives minimum lifespans, not averages or expectations.
In other words, when NASA says "the rover will last 90 days", they mean "the rover will last no less than 90 days".
Consequently, everything should at least hit that lifespan. If it doesn't, something fucked up and the mission failed. That also means that those 90 days is the time NASA wants the spacecraft to last to consider launching it to have been worthwhile.
Henhouse20 t1_j1t5tnb wrote
Not unique at all in the space industry. Everyone else does the same......their spacecraft typically all last longer than their design life
LostFireHorse t1_j1t5v5f wrote
It's the magic of buffer time
stormtroopr1977 t1_j1t65iw wrote
someone at NASA left the back door open and the satellite ran right out. they've been searching the cosmic neighborhood ever since
A-Cheeseburger t1_j1t9182 wrote
It’s easier to estimate the cold, crushing vacuum of space will destroy something in a couple of years rather than pray to Jesus that nothing happens for 20.
caitejane310 t1_j1t9anf wrote
Yeah, idk why I was surprised at all the little tests that us common folk wouldn't even think of. I recently watched Good Night Oppy (highly recommend) and thought it was pretty neat how they would replicate the conditions the rovers were in so they could try and figure out how to get them unstuck.
Lochcelious t1_j1t9ylx wrote
This is a thing?
Jaegermeiste t1_j1taogj wrote
Well, NLT 90 days, unless we yeet it into a planet first, because maybe nobody cross checked the units
whiskysinger t1_j1tatp4 wrote
A UK pint is 568ml A US pint is 473ml
The UK conversion rate of casual language to real pints is not as well understood, despite years of research.
"A swift half" = at least 2 pints "A couple of pints" = at least 6 pints + 1 kebab
iaredavid t1_j1tbmz0 wrote
Tempurpedic! Freeze dried ice cream!
4tune8SonOfLiberty t1_j1tbqlg wrote
It's worth noting that of the half dozen listed zombie satellites, and of the three that have come back to life in the modern era, Scott Tilley is credited with having found two of them.
He keeps this up, he's gonna get a wikipedia page of his own!
Shawnj2 t1_j1tbsdv wrote
Oh yeah that I think it’s hilarious that people think it’s more likely for it to be a coverup than for Northrop Grumman to be incompetent at designing the fairing adapter
Detecting things in orbit is trivially easy using a camera if you know the possible trajectories for an orbit for a rocket launched at a given launch site in a general direction.
Shawnj2 t1_j1tc4z4 wrote
Elon actually provided the launch for a reasonably good price. If you went to any other launch provider, you would have gotten a quote over 2x the price of a SpaceX launch. SpaceX has its flaws, like poor working hours, but the price to put things in orbit has gone down massively because of them, not the other way around. It’s the least bad of Elon’s companies by a long shot.
blueshirt21 t1_j1tca8k wrote
Yes, SpaceX lofted Zuma properly into the agreed upon orbit, and then the satellite likely failed to separate from the payload adaptor provided by Northrop. The satellite should have had it's orbit decay without the satellite being able to finish adjusting it's orbit and would have burnt up.
However, it is a perfect cover story for a satellite the NRO doesn't want people to know about-but Zuma should have been trackable and nobody found it, unless NRO has some super space stealth
Kevimaster t1_j1tfjcs wrote
Under promise and over deliver.
NASA gets huge amounts of public scrutiny whenever anything goes wrong. "$132 million spacecraft breaks 5 years into a 6 year mission" isn't the kind of headline they want. "Spacecraft that was only supposed to last 2 years lasted for 5 years" is the kind of headline they want.
Baremegigjen t1_j1th2n2 wrote
Velcro. In fact it’s the primary method for attaching the reflective blanket that protects the bus (body) of satellites.
za419 t1_j1ths8f wrote
Well, that would fall under "something fucked up and the mission failed"!
keastes t1_j1tiggu wrote
For good reason, NASA likes to overengineer and make pessimistic estimates. Just look at the service life's of Opportunity, Pathfinder, the fact that Apollo 13 made it back...
Ground side we have the luxury of writing the safety regs in blood.
Original-Aerie8 t1_j1tj1pp wrote
> worst-case scenario estimate
Not to be rude, but that seems like a empty word, instead of a explanation at how they arrive at those numbers. What do you base this on?
vk2sky t1_j1tko08 wrote
Nice story. Alway good to see ham radio applied in unusual ways.
In a somewhat similar vein, some of you might enjoy a lecture from my local ham radio club a few years back: Rescuing ISEE-3 with Software-Defined Radio.
[deleted] t1_j1tl8d9 wrote
[removed]
Shyssiryxius t1_j1tlb2l wrote
It's not just the design life but usually the life of the project itself. When you hear that the Curiosity rover was designed to last 6 months that's the amount of time they essentially budgeted for for the project including wages for the teams that operate the hardware. Obviously by the time the rover arrives 18 months later the person doing the NASA budget can then ask for more money to expand the project timeframe, and as long as the hardware continues to function this generally happens YoY.
[deleted] t1_j1tonek wrote
[deleted]
YourLocal_FBI_Agent t1_j1tph98 wrote
From a quick google search, just copypasting the top result so don't at me on the accuracy plz.
"According to the Index of Objects Launched into Outer Space, maintained by the United Nations Office for Outer Space Affairs (UNOOSA), there are 8261 individual satellites orbiting the Earth."
PenguinTD t1_j1tpvyh wrote
And micrometeroid, there is no stopping it from happening, just probability.
https://globalnews.ca/news/9003445/james-webb-space-telescope-damage-micrometeoroid/
Mr_Zaroc t1_j1tqq1q wrote
"Well I put it in an circular orbit around earth, but someone must have put them somewhere else"
"Oh not that old story again, I told you I am not touching your satellites. Its yoir fault if you just leave them in Orbit"
[deleted] t1_j1tqq9o wrote
[removed]
Mr_Zaroc t1_j1tqxgu wrote
Yes we have a fail-safe, but how about a second fail-safe?
IkiOLoj t1_j1tr48l wrote
That's the luxury of not being a for profit organization, they don't have to take a benefit somewhere so they can invest the whole budget in the product. If you were making a product expected to work for 2 years lasting 5, you'd probably be screwing your shareholders somewhere as you would be wasting their potential dividends.
[deleted] t1_j1trzqt wrote
[removed]
plutoismyboi t1_j1ts658 wrote
Someone should make a comic of that, Tumblr style(I can't draw for shit)
Used-Towel5687 t1_j1tsbob wrote
Not nuff money. tank, jet good 👍
btribble t1_j1tsz9u wrote
Yes, when you can set conservative goals and then over-deliver it always looks good. If you're not under promising and over delivering at your work, you're doing it wrong.
PeterMillermark t1_j1ttg3z wrote
ELI5 what am I looking at?
Mr_Zaroc t1_j1ttgr4 wrote
YOLO (You only launch once)
[deleted] t1_j1tupax wrote
2nd-penalty t1_j1tv56z wrote
How tf do you even lose a satellite? I know space is big n all but this is ridiculous, did they just forgot about it?
FunkyFarmington t1_j1tw2pf wrote
So THAT'S where this bullshit of calling near earth orbit "outer space" comes from. I did not know this.
EpiicPenguin t1_j1tyvq8 wrote
> and have some of the most sophisticated failure analysis and prevention tools in the world, which contributes to extended longevity.
Which is why it still boggles my mind that they didn’t add a brush tool to clean off the solar panels on insight lander. They were literally willing to drop rocks on the panels durring the mission, but adding a 5$ brush to the arm thats already on the billion dollar martian lander, apparently thats not an option.
Mmmblop69420 t1_j1tz64g wrote
Damn, that's a tight TIL. Do you have a source for that? Definitely believe you but also curious and have no idea what to google.
wanikiyaPR t1_j1tzcqz wrote
They left the floppy disk with location coordinates near a magnet.
Mmmblop69420 t1_j1tzj7j wrote
Are you for real because I'm in stiches. I had no idea donairs were a unit of the Imperial Magestry. There's kinda something beautiful about the casual approach to measurement that we've abandoned.
Mmmblop69420 t1_j1tzye3 wrote
If I can play devils advocate, because I fucking love space and our 13.8Byo collective history lesson, buuuuut: when you say "least bad," that comes with the assumption that putting stuff in orbit for cheaps is a net-good thing.
Is it?
danielv123 t1_j1u2em9 wrote
I mean, they needed a name and inner space just didn't sound as cool. What can you do.
danielv123 t1_j1u2k2e wrote
Sure, you can get them from AliExpress.
danielv123 t1_j1u2n3k wrote
The important distinction is that they are building a thing to work for 2 years, not to fail after 2 years.
RG3akaAndre3000 t1_j1u41z0 wrote
Space Vehicles and programs are usually assessed and given a “Probability of Success”. NASA usually doesn’t launch anything without a Ps of 95%.
So if NASA has a program that is supposed to have a 2 year mission life, they would launch only when they have a design that has a 95% probability of success. Well if the spacecraft has a 95% chance of lasting 2 years, it’s not like it’s gonna crap out on 2 years and 1 day. It’s got a pretty good chance to keep going.
rocharox t1_j1u45xm wrote
Just call your mom, she can find it and point it out how it was RIGHT IN YOUR FACE...
TheGleanerBaldwin t1_j1u61u9 wrote
Like 'US vs Imperial Units'?
Alkanen t1_j1u7dlb wrote
Outer space as in outside Earth's atmosphere. That's the definition used in astronomy. Any other use is due to sci-fi authors with a bad grasp on nomenclature.
llII t1_j1u7wyv wrote
Link to his twitter account: https://twitter.com/coastal8049
kinboyatuwo t1_j1u8shf wrote
Or just ensure stuff is serviceable. I would take that.
I had a vacuum a few years ago and the brush head failed at the bearing and tore it and the plastic connector apart.
I couldn’t find a replacement head (had ordered 3 that were listed as correct and none fit) and the plastic part I had to “make” by filling with epoxy and using a dremmel to make the recess.
3D printing helps, we just need better ways to get the shapes into the system now. But we need a requirement for a parts availability for day 10 years or the company has to give you a new one.
nickh84 t1_j1u9xjk wrote
Not exactly. It's an arbitrary definition of 100km altitude. As the atmosphere doesn't exactly have an end, and outer space doesn't exactly have a start.
MeagoDK t1_j1uba36 wrote
Sometimes the replacement cost as much as a new machine. Had to replace the rack in my dishwasher (it was rusten) ended up buying a new dishwasher as it was not that much more.
MeagoDK t1_j1ubh2b wrote
In this case nasa just screws the senators because the budget was for 2 years, not 5 years. So they need money for 3 more years.
NASA absolutely have shareholders, they are just government officials and they play politics with them to get their budget and project approvals
ds15 t1_j1ubmqa wrote
I guess we have work to do, who here is good at writing?
ds15 t1_j1ucg70 wrote
Zombie satellites are craft in orbit that stop functioning for many different reasons that can come back to minimal life for short or longer periods of time. LES1 launched in 1965 was lost and considered dead. It was found because some sort of short circuit was able to wake the beacon when it gets enough sun in it's tumbling orbit. Since it's not enough energy to fully function added to the abnormal orbit, it sends back a weak moaning signal. Sorry, this was my first ELI5. Edit: a word.
UseApasswordManager t1_j1ud9so wrote
That wiper is also going to fail someday, and they figure you get more life out of x kg of extra solar panels than they would from an x kg wiper arm
[deleted] t1_j1ue95k wrote
[removed]
[deleted] t1_j1uek6z wrote
[removed]
cbarrick t1_j1ufnzi wrote
That's actually less than I expected
[deleted] t1_j1ul3v1 wrote
[removed]
ExaminationBig6909 t1_j1uldm5 wrote
It's not arbitrary, exactly. The Karman line is a theoretical point at which the atmosphere is so thin that you won't get lift from a wing. So it's a point where airplanes cannot reach.
(Also, the original calculation was for 80 km, which is used by the USAF for the boundary of space.)
PageFault t1_j1um0ar wrote
If they knew where it was, then why were they excited that he found it?
kinboyatuwo t1_j1unwls wrote
Ya it’s crazy. We need more supply chain but also salvage. I’ll bet someone not far away had a failed one and tossed it that had a rack that was fine.
Only way it will happen is legislation sadly.
I would pay extra to know parts are available ans affordable for 20y.
skucera t1_j1uo7w2 wrote
On all prior Mars landers, NASA has relied on Martian wind to clean off the solar panels. That worked fine here, as the lander was active for over twice its planned mission.
nickh84 t1_j1uodyx wrote
Its 100% arbitrary. It's a nice round number. Density is variable and 99.99% of planes r not capable of flying anywhere close to that altitude. And even above that altitude the atmosphere can produce significant drag on space craft.
skucera t1_j1uovax wrote
You perform a Failure Mode and Effects Analysis (FMEA). Once you know the failure modes that you can’t design out of the system, you design mitigation for the rest. You then add redundancy for those modes you can’t mitigate. Finally, you take the probability of an individual critical failure happening and calculate the duration before there is X% chance that a critical failure has occurred, and that’s your planned mission length. If it’s too short, you put in more mitigation or redundancy.
skucera t1_j1up8d7 wrote
Also, The Martian was accurate in how they have an exact copy of every rover and lander they send out so that they can try out fixes/solutions on Earth before they send them out.
skucera t1_j1upltj wrote
The budget to “run science” on a craft is pennies compared to the cost of building, launching, and landing the craft.
MeagoDK t1_j1uua3c wrote
Insight was:(approx)
- Spacecraft 600 million.
- Launch ticket 160 million.
- 2 years operation 60 million.
If we assume insight will last:
- 10 years, that's 300 million, 30% of total budget
- 15 years, that's 450 million, 37% of total budget
- 20 years, that's 600 million, 44% of total budget
A 820 million budget is much easier to approve than 1360 million budget
It's not pennies, you are simply wrong.
Pharisaeus t1_j1uui4d wrote
It was not "lost" in terms of unknown location, but in terms of loss of communication due to a comm system failure. It came back online many years later, thanks to hard-reset caused by deep discharge of batteries when it when in Earth's shadow long enough. At this point no-one was trying to communicate with it any more, and amateur astronomer accidentally picked up the signal.
[deleted] t1_j1uunxz wrote
[removed]
MeagoDK t1_j1uvbld wrote
Yup a thing they would improve it would be to have very standard hardware interfaces. If a rack would always fit then you can easily start saving used but good racks when someone throws out a rack and it would be much to find the broken part.
ExaminationBig6909 t1_j1uvek5 wrote
You keep using that word, I do not think it means what you think it means.
xubax t1_j1uvxua wrote
I found something interesting.
So let me tell you about my day job.
[deleted] t1_j1ux9yl wrote
[removed]
JollyHockeysticks t1_j1uxksz wrote
A million dollars is a low-ball. Anything can happen in space that could randomly cause it to go offline, and without any electronic systems you're never gonna keep track of something that can rotate around the planet in as little at 90 minutes.
kinboyatuwo t1_j1uxn6x wrote
Shoot, they even make changes in their own line up and year to year. You would think some consistency would lower costs for them but someone has done the math I suspect.
kc2syk t1_j1uxyz8 wrote
Doppler shift on a beacon transmitter.
[deleted] t1_j1uzp2t wrote
[removed]
Shawnj2 t1_j1uzp9d wrote
Mostly. There are some downsides, like I increased emissions from more launches, a risk of Kessler syndrome happening (this is mostly overblown unless two satellites hit each other and even then that will just increase the price temporarily as less LEO orbits are available) but IMO things like Starlink/swarm are a net benefit for humanity (while Musk isn’t being a jackass and trying to stop Ukrainian people from using it) because it’s incredibly useful to people in rural areas who would otherwise never have good internet, and there’s other benefits like being able to restock the ISS/send new crew/send new scientific missions into space for cheaper, which means NASA and other space agencies can stretch their thin budgets a bit more. The biggest real downside is probably increased carbon emissions from more launches, which sucks but rockets are also an incredibly tiny contributor to global warming and the physics involved make it difficult to use non fossil fuel sources other than hydrogen produced from electrolysis, and also to a lesser extent mad astronomers since more satellites = less of the night sky being visible and more artificial star looking things they need to filter out.
foolfromhell t1_j1v0vg6 wrote
95% of the science of a mission will be achieved within the expected lifespan of a mission. After that, everything is extra.
skucera t1_j1v2pr1 wrote
Primary mission operations are $30MM/yr; this includes launch activities, landing, and commissioning. The actual cost of the next four years was roughly $15MM/yr. It goes in the annual budget, and congress views this as a good return on investment. If they end up objecting, they can always choose to not fund it.
MainSailFreedom t1_j1v7p2f wrote
I kinda thought outer space was a term for outside the solar system.
ngutheil t1_j1vdxaa wrote
Should have called in final space
dsptpc t1_j1vgdyp wrote
And to think Alan Eustace jumped out of a perfectly good balloon just above 41km. Half way to space.
sparkplay t1_j1vixpb wrote
Nah, only two crafts after decades have reached beyond the solar system, actually the Heliosphere. The Solar System is huge.
[deleted] t1_j1vof2t wrote
[removed]
virtualmang t1_j1w338n wrote
That’s more than I expected. Hot damn there’s a lot of space junk already
LogicalExtension t1_j1wbobo wrote
Again, lost contact. The exciting bit was that they started hearing from it again.
NASA only has so much capacity to talk to different space missions. The Deep Space Network system is in high demand, and they won't waste time trying to reach out to dead systems.
For instance, say tomorrow that Spirit or Opportunity Mars rovers started back up and were trying to phone home. Nobody is listening for them. They're 'lost' missions.
If, however, someone noticed this extra signal coming from Mars then there would be a whole lot of super excited people. You'd see more 'Lost Mars rovers found again' headlines.
Mmmblop69420 t1_j1wmuvx wrote
I agree with every point you make. They are logistical efficiencies. I guess my question was leaning more into why we need and want space colonialism to be cheap.
The star point for instance, where everyone in the world can eventually have cheap access to internet. Isn't that also giving data mining access to more low cost resources? I hate to be pessimistic, but I don't love how we're currently utilizing the power of internet.
If we can't handle our shit at home, why should we affordably be able to throw more trash into space? Hasn't the scarcity been somewhat of a blessing until now?
I dunno, thanks for letting me get that off my chest if anything.
iaredavid t1_j1ww9je wrote
Unfortunately, Velcro's European, but aerospace is definitely the reason we all know about it.
PageFault t1_j1x7ycv wrote
So you think the amateur astrologist was able to figure out how to communicate with it but NASA couldn't? Interesting.
nickh84 t1_j1xgwfh wrote
your definition can be applied at 80km. Is there any objective difference when u pass from 99km to 100km? No, there isnt. The reason 100km was used is because its a nice round number, thats purely it. It's not because planes cant fly that high, and the atmosphere extends well past 100km. The point is, its just an agreed upon number by an international group to use as a reference point and for legal reasons. Thats arbitrary. Now if u can define the precise difference between 99km and 100km, then its not arbitrary. Good luck with that tho
LogicalExtension t1_j1xhjkz wrote
Not communicate, just see that it was sending a signal that it wasn't before.
There's publicly accessible databases of all known satellites. You look up in a part of the sky and see a signal, you can look up what's in that orbit. For most, you can then find public information. If it's a satellite that's supposed to have died, and you're seeing a signal, well - that's interesting.
MeagoDK t1_j1xj8ug wrote
Even if you halve the operational cost, it's stil not pennies.
And yes off cause they do. That's the whole point. It's easier to approve incremental than all at once
ExaminationBig6909 t1_j1xk9ql wrote
All right. What's the difference between 79 km and 80?
smithsp86 t1_j1xndom wrote
It’s also a budget strategy thing. Using Spirit and Opportunity as examples. It’s much easier to stay within budget if they only put 90 days on paper. Once you have the hardware in place it becomes essentially automatic to get extra funding to keep operating. There’s just no sense placing the long term plan in the original proposal.
Used-Towel5687 t1_j1xz92j wrote
Insufferably accurate… if only we were born on a planet that isn’t trying to destroy one another every 50 years…. It’s a really great topic to talk about, as the more knowledgeable the general public is, the more information spreads, that everybody IS actually trying to live in harmony…. Nope, nukes.
[deleted] t1_j213qhk wrote
[removed]
[deleted] t1_j1rudw0 wrote
[removed]