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> (even if blasted directly at you)
<egg> !wpn -add:wpn box
<Qboid> egg: Weapon added!
<egg> !wpn Fiora
* Qboid gives Fiora a rubidium asymmetric vial of Y-909
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<kmath> <sigfig> little rocket only carries 350kg dont bully it
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<egg|phone|egg> !Wpn bofh, Fiora, & whitequark
* Qboid gives bofh, Fiora, & whitequark an astatine basilisk
<egg|phone|egg> Hah, after typing Fiora my phone thinks I'm writing Italian
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<bofh> mm, astatine
<egg|work|egg> !wpn bofh
* Qboid gives bofh a barium astronomer
<bofh> Oh hey I have all I need for BaAt_2
<UmbralRaptor> …Astatine compounds? o_O
UmbralRaptor is now known as NomalRaptor
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<egg|work|egg> !wpn u
* Qboid gives u a dorsal doomed crystal
<egg|work|egg> uh
<egg|work|egg> !wpn NomalRaptor
* Qboid gives NomalRaptor a Phoenician expression
<NomalRaptor> !wpn egg|work|egg
* Qboid gives egg|work|egg a signaling nitrated variety
<egg|work|egg> eggscentric nomaly
<NomalRaptor> You feel anxious about the Kepler equation.
<egg|work|egg> NomalRaptor: I'm confused by gravity losses
<NomalRaptor> Howso?
<egg|work|egg> NomalRaptor: what they are exactly
<egg|work|egg> the element of change in energy is (obviously) the inner product of the velocity and the intrinsic force
<egg|work|egg> but then if the velocity is upwards, this would suggest that the best way to increase energy is to keep pushing that way
<egg|work|egg> but that maximizes gravity losses?
* NomalRaptor 's understanding seems to be a bit superficial.
* egg|work|egg pokes bofh with NomalRaptor
* NomalRaptor pokes some equations w/ a stick.
* egg|work|egg pokes NomalRaptor with bofh
<NomalRaptor> Ow.
* NomalRaptor is poked with a type II superconductor.
<NomalRaptor> Something something nonconservative forces?
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<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.
<NomalRaptor> (this == KSP, right?)
<egg> unfortunately not an episode of #floatingpointwithatlas, but at least the profile pic is atlas and it's about floating point https://twitter.com/stephentyrone/status/890980662525800448
<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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<Iskierka> !wpn -add:wpn heisenbug
<Qboid> Iskierka: Weapon added!
<kmath> <Alex_Parker> Watch @LSST begin to sprout from a mountaintop in under 15 seconds! https://t.co/syiW3vwnvZ
<egg> Iskierka: is that bug actually a cat
<egg> UmbralRaptor: telescopes blooming
<UmbralRaptor> egg: remember not to over water them.
<UmbralRaptor> Also, have you tried meowing at the bug?
<bofh> grr
<bofh> "what did I mess up in this codebase to get these weird audio artifacts"
<bofh> *thirty minutes later*
<bofh> "oh, turns out my headphones weren't plugged all the way in"
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<UmbralRaptor> hah
<kmath> <TechnicallyRon> You: Panic at the disco Me, an intellectual: Anxiety in the everywhere
<kmath> <willmartin19> Pannick At The Disco! https://t.co/MXnVBGo7Tu
<egg> Fiora: is this a 1-dimensional cellular automaton running on a 1-torus https://twitter.com/FioraAeterna/status/890955233316057088
<kmath> <FioraAeterna> https://t.co/B8GvcdiKfr
<egg> SnoopJeDi: more traces aren't going to help, since they remove the bug somehow Ꙩ_ꙩ
<bofh> egg: load-bearing printf()
<egg> bofh: is there a pun here? if so I don't get it
<bofh> egg: no, just stating that it's a thing
<egg> (in this case it's a load-bearing LOG(ERROR) I guess
<egg> )
<bofh> rofl I just got described as "the resident numerical analysis masochist"
<egg> :D
<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*
<egg> UmbralRaptor: J. Cat Cogn. Thermodyn.