egg|nomz|egg 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> egg|nomz|egg: generally if your eyes are dewing over, that's not the weather. | <ferram4> I shall beat my problems to death with an engineer.
<UmbralRaptop> Tofu here
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<bofh> UmbralRaptop: also tofu
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<bofh> lmao I just had some random RATP staffer do a triple take at me
<bofh> I'm only sitting on a bench at my laptop reading Laplace's Mécanique Céleste while wearing a straw hat with VLC stickers on it,
<UmbralRaptop> Perfectly normal
<bofh> it's not even that late, like it's not even 3AM,
<UmbralRaptop> Huh, Trujillo et al use MERCURY6 on 2015 TG387
<UmbralRaptop> Quadrupole moment from the giant planets o_O
<bofh> wait wtf
<UmbralRaptop> bofh: something something simulations. Search for "2015 TG387" on arXiv
<bofh> UmbralRaptop: no it's more I'm pretty sure at least a few of the giant planets should have ~zero quadrupole moment
<SnoopJeDi> SilverFox, ow.
<bofh> SilverFox: I swear to fucking god I marked an assignment that said s--no, that one had the line "let
<bofh> "let \epsilon > 0 and 3 be any real number"
<bofh> nevermind
<SnoopJeDi> bofh, LOL
<SnoopJeDi> oh jeez, I've *just* realized why the first line is obvious >_>
<SnoopJeDi> I showed this to the person who recommended that I read Anathem and their response was "how did you get chapter 0 of The Book"
<bofh> ROFL
<B787_300> egg: what is that elestrial reference article about?
<B787_300> is it the release of ICRF3?
<egg> yeah
<egg> B787_300: with a funny leap second remark at the beginning
<B787_300> mas is milliarcsec right?
<egg> yes
<egg> B787_300: the first sentence is "on 31 dec. 2018 at midnight, we won't move our watches forward one second (unless the IERS forces us to by then...) but we will slightly move the axes of our fundamental celestial reference system"
<B787_300> i wish the accuracy on the celestial sphere graphs were uploaded in full size
<egg> wait no that's old
<B787_300> yeah that is from 2013
<egg> shiny website
<B787_300> wait why are they all in radio bands (S/X, K, X/Ka)?
<B787_300> never mind
<bofh> b/c the ICRF is presumably using radio astronomy and those are the bands our big dishes primarily RX in? :p
<B787_300> i keep forgetting that ICRF is based on radio sources not visible
<B787_300> google helpfully is telling me that this isnt the first time i put that search into google
<B787_300> and egg those images arent the same as what the french article had
<egg> B787_300: the optical realization would be Gaia CRF
<egg> or Gaia CRF 2 or whatever
<egg> there's the old HCRF but it has high errors
<B787_300> isnt the next batch of GAIA data due out soon too?
<egg> possibly, haven't followed
<B787_300> HCRF was Hipparchos Catalog based?
<egg> HCRF?
<Qboid> egg: [HCRF] => Hipparcos Celestial Reference Frame
<B787_300> yes it is
<egg> but there's no h
<B787_300> ah GAIA CRF2 was released Apr 25 18
<B787_300> egg that is just me forgetting how it is spelled
<B787_300> https://arxiv.org/pdf/1804.09377.pdf also almost 3 pages of authors
<egg> !acr -add:Hipparcos High Precision PARallax COllecting Satellite
<Qboid> egg: I added the explanation for this acronym.
<egg> Starlette?
<Qboid> egg: [Starlette] => Satellite de Taille Adaptée avec Réflecteurs Laser pour les ÉTudes de la TErre
<egg> Acronyms \o/
<B787_300> LAGEOS?
<Qboid> B787_300: [LAGEOS] => LAser GEOdynamics Satellite
<B787_300> good we cant just have the french geodessy sat in there
<bofh> today in "bofh": I just wound up apologizing to a snail in broken French (I kicked its shell by accident thinking it was a rock, it seems okay).
<UmbralRaptop> ow
<egg> bofh: okay, but have you considered: eating the snail,
<egg> B787_300: unfortunately Stella isn't an acronym afaic
<egg> s/$/t/
<B787_300> is escargot cooked?
<Qboid> egg meant to say: B787_300: unfortunately Stella isn't an acronym afaict
<bofh> egg: nah, that's today's lunch,
<bofh> B787_300: yes.
<egg> yes, and the snails need to be purged
<B787_300> purged?
<B787_300> do i want to know?
<egg> third picture
<egg> salt them so they drool out anything non edible they might contain
<bofh> Interesting.
<bofh> What's the rate of incidence of Strongyloides stercoralis amongst random FR snails?
<bofh> also Angiostrongylus cantonensis
<bofh> for that matter
<bofh> I suppose if you make sure they're *very* well-cooked you'll be fine (also it seems like it hasn't hit Europe yet according to wikipedia???)
<B787_300> UmbralRaptop: do you think I should rent a car for this weekend or do you think ubering around would be fine (and what about costs)
<UmbralRaptop> B787_300: I, er, haven't used Uber.
<B787_300> ...
<UmbralRaptop> Road layouts + traffic is somewhat stressful, but my baseline is places like KC…
<SnoopJeDi> There are estimation sites for Uber/Lyft FWIW
<UmbralRaptop> Reston area should be fine for driving. If you're going into DC, parking is awful enough that I'd look into transit.
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<bofh> win 56
<iximeow> win 95
<iximeow> (how do you heven have 56 windows)
<bofh> iximeow: a lot of open PM windows, and a lot of channels I virtually never look at, lol.
<UmbralRaptop> thermonuclear tabsplosion?
<SnoopJeDi> yea DC is a car exclusion zone for sure. the upshot is that the Metro is great for getting into the city (if not necessarily around it)
<B787_300> UmbralRaptop: yeah I'll be in reston pretty much all the time
<UmbralRaptop> Bus + metro results in very long commutes, but that's acceptable for tourism purposes.
<SnoopJeDi> Newseum is awesome btw :)
<B787_300> SnoopJeDi: i would but i am going for a wedding and the only day i wont be doing wedding stuff is monday and i have never been to Udvar so i am going there
<SnoopJeDi> ah okay
<B787_300> god fucking dammit i hate being 24
<B787_300> a $75 fee for being "young"
<UmbralRaptop> Fun
<kmath> <landru79> https://t.co/OEKTW8K5p7
<kmath> <bofh453> <@bofh453> goddamnit two random girls walked by talking about femtosecond laser physics and fuck I really wish I kn… https://t.co/r3PXZUQtRR
<bofh> (I was at Cité Florale at the time)
<B787_300> what is special about femtosecond laser that requires it own special physics
<UmbralRaptop> Getting pulses that short is, uh, highly nontrivial. Something about getting 2 wavetrains to overlap just right?
<B787_300> what is that at least a THz pulse rate?
<B787_300> also what power levels are we talking here?
<UmbralRaptop> at least, possibly PHz, and unsure.
<UmbralRaptop> bofh?
<SnoopJeDi> ♫ You put your short pulse in / you get a long pulse out / you take your spread-out pulse / and you shake it all about / you do the hokey pokey and you amplify P_out / that's what it's all about ♫
<SnoopJeDi> alternatively, "phase-space pokey" but eh
<B787_300> just thinking that with that short of a pulse you could get silly accurate ranging measurements (if you had an accurate enough clock and detector)
<SnoopJeDi> and your pulse doesn't get eaten!
<UmbralRaptop> ?!
<B787_300> Yeah I am just as confused
<SnoopJeDi> B787_300, you're talking about ranging at distance?
<SnoopJeDi> IIRC the coherence length of such pulses is *very* short
<B787_300> Yes. Ideally between 100km to oh about 40000 km
<B787_300> I mean imagine the fun geodessy with super accurate orbit measurements
<UmbralRaptop> Hrm. MOLA did 8 Hz, ICEsat will do 20 kHz
<SnoopJeDi> coherence lengths here are something more like μm
<SnoopJeDi> and even if they were long, I assume you'd dump your pulse energy into...something.
<SnoopJeDi> which I guess is soooorta what you're getting at? but I think you'd get away with conventional lidar
<B787_300> Doesn’t coherence only matter if you are trying to image? I though if you are just trying to get a return it doesn’t matter
<SnoopJeDi> laser ranging to the lunar reflector array is what, fraction of a cm?
<SnoopJeDi> granted that's a *long* collection time
<B787_300> Don’t they time gate the returns so you don’t eat a false detection. I mean we know where the moon is so just open the shutter on the dectector a couple milli sex before earliest possible return
<B787_300> Millisecs ^ damn autocorrect
<B787_300> s/eat/get
<Qboid> B787_300 meant to say: Don’t they time gate the returns so you don’t get a false detection. I mean we know where the moon is so just open the shutter on the dectector a couple milli sex before earliest possible return
<SnoopJeDi> at any rate, I know ultrashort pulses in air are sufficiently good at generating all kinds of interesting nonlinear phenomena (one group here uses them to study the Kerr effect or maybe it's supercontinuum generation using that IIRC)
<SnoopJeDi> but uh, optics people are wily so...maybe?
<SnoopJeDi> cosmic brain: rangefinding by inducing backlasing in the target
<B787_300> Wouldn’t that require the ablation of small amounts of material
<SnoopJeDi> hmm, dunno! backlasing is usually pump/probe so maybe not
<SnoopJeDi> I've only ever seen it for clouds of gas, hehe
<SnoopJeDi> so maybe you have to first vaporize enough of the target to backlase :D
<SnoopJeDi> which is alarmingly close to what ChemCam on MSL does...
<UmbralRaptop> "It's a reference book. It's not a textbook. It's too short, it doesn't develop anything. The only value to this textbook is that it makes you learn very hard PDE and general vector calculus theory. But it doesn't teach it at all, it just holds you accountable for it."
<bofh> B787_300: well, more the consequences OF that laser physics, specifically the conversation was about pump-probe spectroscopy
* B787_300 watches that fly over his head
<B787_300> What is pump probe spectroscopy
<bofh> basically take a laser, use one pulse to break a bond and another as a means of checking what state the relevant atom is in
<bofh> varying the delay between the two as you need
<SnoopJeDi> and a whole slew of tricks developed thereupon in the intervening ~30 years
<SnoopJeDi> it's a bit like the invention of the scanning tunneling microscope (or the laser itself!) in that sense: it puts a new tool in the "optical toolbox"
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<egg> !meow whitequark
* Qboid meows at whitequark
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<egg|cell|egg> !meow bofh
* Qboid meows at bofh
<egg|cell|egg> !meow whitequark
* Qboid meows at whitequark
<egg|cell|egg> !seen bofh
<Qboid> egg|cell|egg: I last saw bofh on [03.10.2018 03:41:23] in #kspacademia saying: "varying the delay between the two as you need"
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* UmbralRaptop 🔪 viruses
<egg|work|egg> whitequark: bofh: how do you say "I pet 1 million cats" in ru
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<bofh> !meow egg|cell|egg
* Qboid meows at egg|cell|egg
<kmath> <✔planet4589> The @ParkerSunProbe entered Venus' gravitational sphere at 2035 UTC Oct 2. Venus closest approach in a little unde… https://t.co/6xwe2oDOxF
<kmath> <✔planet4589> @NovaSilisko @ParkerSunProbe Yes
<UmbralRaptop> !!!
<bofh> like I'm still not sure I understand the point of Parker Solar Probe, but that's still cool as shit.
<bofh> speaking of solar stuff I just grabbed ftp://sohoftp.nascom.nasa.gov/pub/www/freestuff/freestuff.html out of curiosity and the program required VBRUN300.DLL and holy crap that is a blast from the past.
<UmbralRaptop> Something something solar wind something corona something space weather
* UmbralRaptop could ask some of the heliophysics and space weather people on campus.
<bofh> ugh. so yesterday my knee finally stopped being vaguely dodgy and then started hurting again after only about 6km of walking.
<bofh> UmbralRaptop: could've sworn we already have several missions in the solar wind/corona region, so I'm a bit confused. should prolly just read some papers.
<UmbralRaptop> Nothing anywhere near as close
<bofh> basically my question boils down to "why do you need to fly *that* close to the outer corona to probe it? it's incredibly hot so couldn't you do it from a distance using various emission spectroscopies?"
<B787_300> bofh: something something data degredations or chemical reactions / decays changing the composition?
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<UmbralRaptop> My understanding is limited, but something about bringing in magnetometers and particle detectors?
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<kmath> <Steven_Banham> WOW ⏎ "The atmosphere of the newly melted Earth, composed of mostly rock vapor and silicate clouds, ... lasted throug… https://t.co/wEw0RORn2h
<UmbralRaptop> Does it need to do anything besides say "yes"? https://twitter.com/verge/status/1044577686612512768
<kmath> <✔verge> Firefox Monitor will let you know if your data has been stolen https://t.co/ww3Qn2MD6p https://t.co/kdq9t3zPok
<kmath> <cgranade> A lot of people are talking about sequels to MEAN GIRLS today, but it really felt to me like that film describes a… https://t.co/rf0z0rT6EA
<UmbralRaptop> hah
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<egg> !wpn whitequark
* Qboid gives whitequark a [REDACTED] nonagon
<egg> !wpn bofh
* Qboid gives bofh a verbose div
<bofh> !wpn egg
* Qboid gives egg a sharp polyether
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<egg> !pet NomalRaptor
* Qboid pets NomalRaptor
* NomalRaptor feels anxious about research and illness.
<SnoopJeDi> are you still in the lurch with insurance, NomalRaptor?
<NomalRaptor> SnoopJeDi: thankfully everyone realized that I was not at fault, and I've been able to sign up.
<NomalRaptor> This is about a cold, actually >_>
<SnoopJeDi> that's great to hear!
<SnoopJeDi> the bit about the insurance, not the cold :)
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* egg|cell|egg gives nomalraptor a handkerchief
<egg|cell|egg> !wpn -add:wpn handkerchief
<Qboid> egg|cell|egg: Weapon added!
* NomalRaptor has gone through multiple boxes of kleenex already
* APlayer gives NormalRaptor a tangent
* NomalRaptor 🔪 radvel
<NomalRaptor> And that's the presidential alert
<NomalRaptor> Got a notification and phone vibrated
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* NomalRaptor 🔪 a missing Parenthesie
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<SnoopJeDi> I didn't get it, no signal in the lab :v
<NomalRaptor> It ended up being like a 'normal' emergency alert
<APlayer> Is it an SMS, or what sort of alert?
<SnoopJeDi> I believe it's piggybacked on SMS, yea
<SnoopJeDi> The text of it has been available for weeks, so I wasn't really anticipating it anyway
<bofh> https://twitter.com/jaxsun/status/1047485759278780416 how does the USA somehow manage to keep getting more and more bullshit
<kmath> <jaxsun> Whoa. New for-profit immigration prison report out, includes: "Floss is only available through detainee commissary… https://t.co/J0ncm4y8vg
<egg> !wpn NomalRaptor
* Qboid gives NomalRaptor an egg|zzz|egg
<egg> um.
<NomalRaptor> Hi
<NomalRaptor> Hope your passport is in order
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<egg> um
<NomalRaptor> !pet egg
* Qboid pets egg
<bofh> egg: https://en.wikipedia.org/wiki/Saint-Nectaire this stuff is tasty
<egg> !meow whitequark
* Qboid meows at whitequark
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<bofh> !pet egg
* Qboid pets egg
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<APlayer> Wooo!
<bofh> what the actual fuck
<bofh> that "moon" is the size of goddamn Neptune
<NomalRaptor> I mean, that's the sort of weirdness you'd expect for the first detection.
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<bofh> UmbralRaptor: I mean, sure, it's more I'm amazed that's a thing that can even happen.
<UmbralRaptor> Fair enough.
<UmbralRaptor> Please don't ask me what the formation mechanism is.
<bofh> I mean I wasn't eggspecting anyone to have an idea, honestly.
<iximeow> that's no moon...
<UmbralRaptor> "The blackbody equilibrium temperature of the planet and moon, assuming zero albedo, is ~350 K. Adopting a more realistic albedo can drop this down to ~300 K. Of course, as a likely gaseous pair of objects, there is not much prospect of habitability here, although it appears that the moon can indeed be in the temperature zone for optimistic definitions of the habitable zone."
<UmbralRaptor> "The origins of such a system can only be speculated upon at this time. A mass ratio of 1.5% is certainly not unphysical from in situ formation using gas-starved disk models, but it does represent the very upper end of what numerical simulations form (40). In such a scenario, a separate explanation for the tilt would be required. Impacts between gaseous planets leading to captured moons are not well studied but could be wo
<bofh> Hrm.
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<awang> Got an interesting C++ problem
<awang> MSVC compiles that fine, but clang-cl does not
<awang> Gah
<awang> Compilers are allowed to pick the underlying type for enums however they please, right?
<awang> Apparently Clang picks unsigned int as the underlying type for an enum value of 0x8000'0000, but picks regular int when --target=x86_64-windows-msvc is given and converts 0x8000'0000 to std::numeric_limits<int>::min()
<awang> I'm not sure whether this should be considered a bug or not
<awang> Are enum values allowed to be converted like that?
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<awang> Never mind, it looks like it's bug 30776 on the tracker: https://bugs.llvm.org/show_bug.cgi?id=30776
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<oeuf> !meow bofh, whitequark, et al.
* Qboid meows at bofh, whitequark, et al.
<bofh> !meow oeuf
* Qboid meows at oeuf
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