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
<egg|zzz|egg> bofh: mrow
<egg|zzz|egg> bofh: you should make https://twitter.com/LevelOfConfidence
<bofh> Yes, good idée.
<bofh> I should have a free email for that. I need an avatar and ideas.
<egg|zzz|egg> bofh: hm, a metrological weird sun
<egg|zzz|egg> UmbralRaptop: how many IAU commissions are there Ꙩ_ꙩ
<egg|zzz|egg> "IAU Commission 49 Interplanetary Plasma and Heliosphere"
<egg|zzz|egg> "Together with Commission 10 (Solar Activity) and Commission 12 (Solar Radiation and Structure), it is included in Division II (Sun and Heliosphere)."
<egg|zzz|egg> aaaah they're not numbered hierachically by division???
<egg|zzz|egg> *clicks link*
<UmbralRaptop> bofh: some sort of moth or moon?
<egg|zzz|egg> wait, why do i end up on division E https://www.iau.org/science/scientific_bodies/divisions/E/
<egg|zzz|egg> UmbralRaptop: no, LevelOfConfidence is clearly a weird sun
<egg|zzz|egg> UmbralRaptop: GUM, THIS
<UmbralRaptop> hrm
<UmbralRaptop> Poke at SOHO, SDO, stereo A/B, or the like?
<egg|zzz|egg> UmbralRaptop: bofh: um so IAU Commission E1 WG solar irradiance has this banner Ꙩ_ꙩ https://www.mps.mpg.de/4492376/wg
<bofh> egg|zzz|egg: what on *earth*
<egg|zzz|egg> bofh: astronomers doing website design?
<egg|zzz|egg> bofh: still looks better than the русхим website
<egg|zzz|egg> bofh: ah but their newsletter has the same banner...
<egg|zzz|egg> .... stretched even more https://www.mps.mpg.de/4950997/newsletter_2017_05.pdf
<egg|zzz|egg> well, that is, stretched after adding the text and IAU logotype
<egg|zzz|egg> whereas the original is a stretched sun with superimposed graph, text, and logotype
<bofh> LOL
<bofh> I mean okay but the русхим website is truly pushing it.
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<_whitenotifier-1656> [Principia] tokumeichan starred Principia - https://git.io/fhiqB
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<UmbralRaptop> egg|cell|egg: go the bulletin C 57 pull request.
<UmbralRaptop> s/go/do/
<UmbralRaptop> typing is hard at 7 am.
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<UmbralRaptop> egg|cell|egg: did you do the bulletin C 57 pull request?
* UmbralRaptop chirps at egg
<UmbralRaptop> "In its final report, Roman’s Astronomy Science Working Group recommended that various Shuttle payloads include three infrared telescopes, as well as the Hubble Space Telescope (primarily for optical wavelengths), which was already a few years into planning. The first project in the infrared would be a small cooled telescope, which eventually developed into SIRTF.7 The second infrared project was to be a pair of large, u
<UmbralRaptop> (This was published in 1973. SIRTF became Spitzer, which launched on a Delta II in 2003. The 4 m became Herschel, which launched in 2009 on an Ariane 5.)
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<egg|work|egg> UmbralRaptop: not yet, i'm at work
<egg|work|egg> UmbralRaptop: I should do it when i get home
<UmbralRaptop> hrm
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<UmbralRaptor> Reading this Spitzer history remains distressing. The Hubble and Compton telescopes were highlighted in the 1972 decadal survey.
<UmbralRaptor> Also, apparently the shuttle would have been a terrible platform for an IR telescope.
<SnoopJeDi> UmbralRaptor, link to history?
<kmath> <neeecoley> @Chemjobber We had a bag of badger hair for emergency seeding needs.
<bofh> also yeah, link to history?
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<bofh> egg: ooh, excellent.
<SnoopJeDi> thanks!
* UmbralRaptor pokes expedia with a stick. I'm flying from IAD, not SVO!
<UmbralRaptor> … Leaving on March 15 is like $800 cheaper than the 16 or 17 o_O
<UmbralRaptor> egg: did you do the bulletin C 57 pull request?
<SnoopJeDi> UmbralRaptor, price discrimination \o/
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<UmbralRaptop> /o\
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<egg> UmbralRaptop: oh i forgot, thanks
<UmbralRaptop> Hrm. 2259 in Mordor.
<egg> UmbralRaptop: ?
<UmbralRaptop> CH is Mordor!
<egg> UmbralRaptop: ah yes
<egg> UmbralRaptop: but whats' special about it being 22:59
<egg> or 23:40 now
<_whitenotifier-1656> [Principia] eggrobin opened pull request #2070: Bulletin C 57 - https://git.io/fhPMe
<egg> hm it took me 20 days to remember this time, I should really set a reminder or something
<kmath> <eggleroy> It’s that time of the year again: https://t.co/1SRLMRJtBhhttps://t.co/7ceZ76WpxB
<egg> hm it's not always published on the same day
<egg> Ꙩ_ꙩ those subscription forms are, er, very different
* egg now has username egg at IERS
* egg meows at UmbralRaptop
* egg meows at pizzaoverhead
<egg> pizzaoverhead: have you seen any otters
<pizzaoverhead> egg!
<pizzaoverhead> I have notter
<pizzaoverhead> Though I did meet a family of grey seals.
<egg> nice
<pizzaoverhead> They made the best "plap plap plap" sound bouncing at the water's edge.
<pizzaoverhead> How about you?
<egg> pizzaoverhead: Principia does mascons
<egg> pizzaoverhead: but fear not, there are repeat ground track orbits https://twitter.com/eggleroy/status/1083545992899846144
<kmath> <eggleroy> Ryan P. Russel and Martín Lara (2006), Repeat Ground Track Lunar Orbits in the Full-Potential Plus Third-Body Probl… https://t.co/9lt46X9ssR
<pizzaoverhead> Mascons as in non-spherical gravity fields???
<egg> pizzaoverhead: we've had nonspherical for a long time, but only oblateness
<egg> now you have the real deal
<pizzaoverhead> Oh wow!
<pizzaoverhead> How are they modelled?
<egg> pizzaoverhead: re. oblateness, Manley made a nice video about its effect ft. Principia https://www.youtube.com/watch?v=UCMSDvp-n74
<kmath> YouTube - "Fat Earth Theory' - How Earth's Shape Changes Spacecraft Orbits
<egg> the fancier gravity models are more recent, there aren't any videos for those
<pizzaoverhead> Thanks!
<egg> pizzaoverhead: as for how the modeling works, the usual, spherical harmonics
<egg> pizzaoverhead: this is a fairly nice introduction https://twitter.com/eggleroy/status/1061617686344536064
<kmath> <eggleroy> Franz Barthelmes (2013), Definition of functionals of the geopotential and their calculation from spherical harmoni… https://t.co/uMM3lNlMPM
<kmath> <eggleroy> Gravity disturbance¹ of the Combined Gravity Model GGM05C² to degree and order 𝑁 with respect to GRS80, on the GRS8… https://t.co/GXmLnlboiK
<pizzaoverhead> Oooh it has pictures
<egg> pizzaoverhead: Principia only goes to degree and order 10 for the Earth, and 30 for the Moon
<pizzaoverhead> How did you source the data?
<egg> see links
<egg> GGM05C
<egg> for the moon we went with GRGM1200A, not GL1500E
<pizzaoverhead> Very cool
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