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
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<egg|zzz|egg>
mofh: hah, there are true (as we defined) periapsides where the osculating elements say you are at the apoapsis (the osculating elements at any apparent periapsis say that you are at an apsis, but they may be confused as to which one that is)
* egg|zzz|egg
meows at whitequark
<egg|zzz|egg>
okay for 45 TOPEX/Poseidon orbits, I get a mean ω of +97.79(44)°, and a variability in ω of ± 10.6568° (95%), that might be usable
<egg|zzz|egg>
hm there's the one apsis that gets misidentified at 269.362 °, that's why the mean is screwed up
<egg|zzz|egg>
two, there's another one at 268.954
<egg|zzz|egg>
mofh_: so it's not quite robust enough...
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<mofh>
egg|work|egg: huh, it's interesting how those two apsides are like half a degree apart but both misidentified
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<egg|work|egg>
mofh: well yeah they're opposite apsides, the orbit has apparent apsides at 90 and 270 deg
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<egg|work|egg>
s/t aps/t periaps/
<galois>
egg|work|egg meant to say: mofh: well yeah they're opposite apsides, the orbit has apparent periapsides at 90 and 270 deg
<kmath>
<✔BerkeleySETI> Berkeley SETI researcher Brian Lacki’s paper on searching for shiny objects in our solar system has now been publis… https://t.co/62EJyozsaG
<SnoopJeDi>
if not they damned well better
<UmbralRaptor>
heh
<SnoopJeDi>
My inbox is sitting at 1,100...
<SnoopJeDi>
!8 nuke it from orbit?
<galois>
SnoopJeDi: yes
<SnoopJeDi>
I'mma do it
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* UmbralRaptor
stares at possible flights in September and October
* UmbralRaptor
notes that there are ones that leave DCA around the same time as the first morning bus stops by my apt
<UmbralRaptor>
(The correct answer to traveling to/from DC is always drive to IAD, apparently)
<UmbralRaptor>
Speaking of IAD, has rqou been circling it for a week?
<egg|zzz|egg>
mofh: blarg i don't get it, plotting the r(u) for TOPEX/Poseidon, my method *should* find the right apsis consistently...
<mofh>
egg|zzz|egg: can I see that plot? (also if you found apsides at 268.whatever and 269.whatever and the true one is at 270 i'm starting to wonder if this is numerical issues since those values are sufficiently close to make me suspect method correctness)
<mofh>
egg|zzz|egg: also i was just at le louvre listening to Brahms, moment.
<mofh>
(specifically his Violin Concerto in D Major, Op.77)
<egg|zzz|egg>
mofh: no the problem with the 268 whatever is that they're spurious apsides, with the true ones at 90
<egg|zzz|egg>
not that they ought to be 270, i don't care about 2 deg
<mofh>
egg|zzz|egg: I mean 270-180=90, this feels like a complementary angles issue
<egg|zzz|egg>
no
<egg|zzz|egg>
look at the graph
<egg|zzz|egg>
the spurious periapsides are at 270, the true ones at 90
<egg|zzz|egg>
the 180 degrees here are because ω is near 90 (or 270), putting the true periapsis at the pole (where J2 induces spurious periapsides at the poles anyway)
<kmath>
<eggleroy> @stephentyrone Do you (or Atlas) happen to know of any useful resources regarding the error analysis of polynomial… https://t.co/SfAsoxSqyg