UmbralRaptor changed the topic of #kspacademia to: https://gist.github.com/pdn4kd/164b9b85435d87afbec0c3a7e69d3e6d | Dogs are cats. Spiders are cat interferometers. | Космизм сегодня! | Document well, for tomorrow you may get mauled by a ネコバス. | <UmbralRaptor> … one of the other grad students just compared me to nomal O_o | <ferram4> I shall beat my problems to death with an engineer.
* UmbralRaptor
tries to think of cool in progress plays at the moment. Just OSIRIS-REx and Hayabusa 2?
<UmbralRaptor>
(relatedly, does Dawn count as 2 points?)
<bofh>
the IMU thus thought it was in a spin so it activated reaction wheels, which *caused* it to go into a spin
<bofh>
which ran down the battery as in this state the spacecraft low-energy configuration has the panels pointing sideways against the sun.
<UmbralRaptor>
Eek.
<bofh>
basically it's recoverable IF when the battery recovers enough charge to power up the thing, you manage to hit it with commands to:
<bofh>
- Ignore the ring-laser gyros totally
<bofh>
- Turn off most of the equipment
<bofh>
- Power on the X-band exciter
<bofh>
(it apparently doesn't power on without an external command to turn it on for what they seem to claim is safety reasons while doing ground testing, which I find as odd since 40W of X-band RF is basically harmless)
<bofh>
egg|work|egg: admittedly, mine are somewhat superficial too, but that sounds... correct? like it makes sense that you'd have a constrained optimization problem here...
<egg|work|egg>
bofh: but what are gravity losses exactly then
<egg|work|egg>
what do they mean
<bofh>
hmm. I'm a bit confused, are you asking about what force is generated by the energy losses due to gravity?
<egg|work|egg>
bofh: there is a thing known as gravity losses
<egg|work|egg>
bofh: e.g. because if you are thrusting upwards with the same force gravity is exerting on you, you're wasting your time (and hovering)
<bofh>
Yes.
<egg|work|egg>
s/your time/your delta v/ really
* egg|work|egg
doesn't know how to type a delta at work
<bofh>
\Delta :P
<egg|work|egg>
my IRC client doesn't do TeX :-p
<NomalRaptor>
Something about work done on the rocket by the engines being (F-g) * dl instead of F*dl?
* NomalRaptor
installs LaTeX on egg|work|egg's wetware.
<egg|work|egg>
NomalRaptor: but that's effectively just the change in energy
<egg|work|egg>
(if you innerproduct it with v)
<egg|work|egg>
well your dl already has that inner product
<egg|work|egg>
oh right but I'm not computing the delta v expended in any way
<NomalRaptor>
Propellant is assumed to vanish from the universe after exiting the rocket. >_>
<kmath>
<maanow> "Algebra is the offer made made by the devil to the mathematician..." -Sir Michael Atiyah quote in @divbyzero's tal… https://t.co/rjeHdI5eEE
* egg|work|egg
remembers Atiyah-MacDonald as being particularly abstruse
<egg|work|egg>
also costrly
<egg|work|egg>
s/rl/l/
<Qboid>
egg|work|egg meant to say: also costly
<NomalRaptor>
Fun
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<bofh>
NomalRaptor: accurate. also are we violating energy conservation in this universe?
<NomalRaptor>
Probably.
<NomalRaptor>
Though the fact that craft don't pull on each other/planets/moons gravitationally raises questions.
<kmath>
<stephentyrone> The smallest positive normal is 2^emin, and the next smallest is 2^(emin-p). The gap between these two is 2^p times… https://t.co/ZjyyXOrW1m
<kmath>
<stephentyrone> between 0 and the smallest. Having this hole around zero would make floats less usable, so we fill the gap in with uniformly spaced values.
<kmath>
<stephentyrone> (Cheating third tweet): these values happen to fall out nicely in the encoding of floating-point numbers, but users shouldn't need to care.
<egg>
!wpn bofh, NomalRaptor, and whitequark
* Qboid
gives bofh, NomalRaptor, and whitequark a double ray tube
<NomalRaptor>
zap zap
NomalRaptor is now known as UmbralRaptor
<UmbralRaptor>
!wpn egg
* Qboid
gives egg a principle
<UmbralRaptor>
!8ball email advisor about employment letter?
<UmbralRaptor>
;8ball email advisor about employment letter?
<kmath>
UmbralRaptor: Outlook not so good
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<egg>
blargh bug that I can't reproduce when adding logs to figure out what's going on
<egg>
stabbity
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<UmbralRaptor>
Adding logging fixes the problem?
<xShadowx>
the fun bugs are the ones that exist, until you add logging that adds a tiny delay and causes bug to go away
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<regex>
lol, the print statement strut.
<SnoopJeDi>
lmao
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<bofh>
oh god I've never heard it called *that* before...
<SnoopJeDi>
I love it
<SnoopJeDi>
moar stdouts!
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* soundnfury
gives egg a heisenbug
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<kmath>
<whitequark> question. if, when a cat lies on my lap, i feel warmness, then the cat must feel coldness, mustn't it? so they *cool* off us, not *warm*