raptop 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. | We can haz pdf
<galois>
title: Peter Barfuss 𒀱 on Twitter: "<@bofh453> oh, Akkadian is SEMITIC?!? fuck my life suddenly so many things make sense (yes I only literally just realized this *now*)."
<galois>
title: Eric Mamajek on Twitter: "Moe: eta_Earth (freq of Earth-sized planets in hab zone) for *single* G dwarfs is about 0.8(!), but probably very low (~0) for binaries #ExoStar19 #Kepler"
<galois>
title: uel aramchek on Twitter: ""It seems that we're now north of reality.""Then we'd better head south before-""-no, that won't lead us back. Reality is further north.""
<SnoopJeDi>
> go north
<mofh>
egg: so i think it's more the sudden realization
<mofh>
that Akkadian is a Semitic language, and that's why the way that it uses vowels and consonant stems for (strong) verbs is sensible
<galois>
title: Kia☆ on Twitter: "found out today that it's possible to make propellants that require a *continuous input of electrical energy* to continue to burn -- so when the electricity gets turned off, the propellant stops burning. What the heck.… https://t.co/HTGmCtJUdb"
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<galois>
title: Leigh Fletcher on Twitter: "Trying to assemble a white paper on #IceGiants for an ESA call, and really struggling to find a decent infographic for Uranus and Neptune. So I cobbled one together from a variety of sources, hopefully it captures the incredible variety of these systems:… https://t.co/VdcwFKVoje"
<egg|zzz|egg>
mofh_: UmbralRaptop: is there some obvious simplification of v×(w×v) where × is the cross product
<egg|zzz|egg>
(you don't actually need to summon the cross product here of course, this is just the result of the left action of (w∧v) on v)
<UmbralRaptop>
BAC-CAB?
* UmbralRaptop
ignores that there are veggtors not in R³
<UmbralRaptop>
… this cross product is 0, right?
<egg|zzz|egg>
that's fine my question is 3d
<egg|zzz|egg>
ah right, that's wv² - v⟨v,w⟩
<egg|zzz|egg>
not immensely nicer tbh :-p
<mofh>
egg|zzz|egg: yeah i don't think i have anything nicer than wv' - v{v,w} (which still isn't very nice, honestly)
<egg|zzz|egg>
mofh_: {} for the inner product!? D:
<mofh>
er, wtf, i meant to type \langle & \rangle, how the heck did that come out as curly braces?!
<egg|zzz|egg>
mofh_: well yeah the eggscentricity is badly conditioned
<egg|zzz|egg>
mofh_: it's still hyperbolic within 1σ :-p
<mofh>
egg|zzz|egg: yeah i'm wondering if within 1σ is significant enough to actually consider it hyperbolic, which if true, sounds like a big deal
<egg|zzz|egg>
why
<mofh>
hyperbolic comets seem rare? given that the last one made the news for many months
<UmbralRaptop>
If I'm reading that right, this comet is probably the 2nd most hyperbolic ever observed
<UmbralRaptop>
(previously: 1.19, and some one that got ejected in the 80s hit 1.05)
<SnoopJeDi>
mofh, you mean 'Oumuamua?
<egg|zzz|egg>
mofh_: No guarantees are made (either expressed or tacit) for the skewness, kurtosis, higher moments, and other properties of the distribution of this uncertainty
<UmbralRaptop>
egg: aaaaaaaaaaaaa
<egg|zzz|egg>
mofh_: legalese jokes aside, the keplerian elements are ridiculously conditioned near e=1, so the distributions of those uncertainties are probably wild
<egg|zzz|egg>
mofh_: a has a fun uncertainty too
<egg|zzz|egg>
-29(25)
<egg|zzz|egg>
i haz sigdecs / nooo they be taking my sigdecs away
<egg|zzz|egg>
wait no that's not the right wording
<galois>
title: Ferret: "Go off, king." - Radical Town
<mofh>
SnoopJeDi: yes
<mofh>
egg|zzz|egg: yeah, that makes sense
<mofh>
egg|zzz|egg: keplerian elements can be ""fun"" sometimes, i keep forgetting that property...
<egg|zzz|egg>
mofh_: also they're heliocentric elements, not barycentric elements, so for a faraway comet they're variable because jupiter, meaning they don't characterize the distant behaviour
<UmbralRaptop>
aaaaa
<egg|zzz|egg>
also with an arc span of only 7 days you can probably fit the comet to an elephant
<egg|zzz|egg>
note how the larger ellipses have been beaten up a bit
<egg|zzz|egg>
(Ike is ridiculously big, to the eggstent that its L4 and L5 points are not stable)
<mofh>
wtf
<mofh>
...i like the eggstreme wobbliness in the purple arc. what the heck would even cause such short-term periodic behaviour anyhow?
<UmbralRaptop>
hrm. Ike is ~6% the mass of Duna?
<egg|zzz|egg>
mofh_: Duna-Centred, not Duna-Ike barycentric
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<egg|zzz|egg>
UmbralRaptop: don't recall, but over 3,8 % or so which is the threshold for stability
<mofh>
egg|zzz|egg: oh, right, that would make sense. >_<
<egg|zzz|egg>
mofh: clearly you need to play principia to develop an intuition of what real orbits look like in various reference frames
<egg|zzz|egg>
esp. since RO is out for 1.6.x now \o/
<egg|zzz|egg>
x=1
<UmbralRaptop>
1.7 when?
* egg|zzz|egg
glares at glint
<egg|zzz|egg>
UmbralRaptop: so uh during the equinoxes you get glint when the satellite is at the equator between the hours of 7:30 and 16:30 or thereabouts
<UmbralRaptop>
uh oh
<mofh>
egg|zzz|egg: it's on the unboundedly-growing stack that is my TODO list already, :p