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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<UmbralRaptop>
"Our understanding of neutron stars (NSs) has changed drastically since the first Annual Review article by Wheeler (1966) on this subject, when not a single NS was known and the discussion consisted of an entirely theoretical treatment of collapsed dense stars."
<UmbralRaptop>
That's quite an intro.
<bofh>
wow, so like 52 years ago we still hadn't found a single NS?
<bofh>
goddamn
<UmbralRaptop>
Yep!
* UmbralRaptop
is finally getting around to reading one of the papers Fiora linked.
<kmath>
<gravity_levity> 1/ Who wants to hear some scientific intrigue? ⏎ ⏎ A few weeks ago, a group of physical chemists posted a paper onlin… https://t.co/pWUPG1istH
<kmath>
<exoZafar> I just discovered a python thing that will change my life forever: you can make your code talk! On a mac: import os… https://t.co/fbMCaI0ISs
<SnoopJeDi>
not a python thing per se since `say` is just a system command being called
<SnoopJeDi>
but using it from a jupyter notebook is a pretty clever idea for "hey that thing is dnoe"
<UmbralRaptor>
:D
<UmbralRaptor>
Now if only I could set the voice to Miku…
<_whitenotifier-6f89>
[Principia] eggrobin labeled pull request #2030: 15.9.4 has the same bugs as 15.9.3 - https://git.io/fpx0b
<_whitenotifier-6f89>
[Principia] eggrobin closed pull request #2030: 15.9.4 has the same bugs as 15.9.3 - https://git.io/fpx0b
<_whitenotifier-6f89>
[Principia] eggrobin pushed 2 commits to master [+0/-0/±10] https://git.io/fphIh
<_whitenotifier-6f89>
[Principia] pleroy e84ff04 - 15.9.4 has the same bugs as 15.9.3.
<_whitenotifier-6f89>
[Principia] eggrobin e4d9091 - Merge pull request #2030 from pleroy/15.9.4 15.9.4 has the same bugs as 15.9.3
* UmbralRaptor
🔪 Java
<UmbralRaptor>
Languages that calculate 1/3 by default the way you most likely mean it: Python 3.
<UmbralRaptor>
Languages that do not: *
<SnoopJeDi>
Julia does "the right thing" as well
<SnoopJeDi>
although interestingly, x//y constructs a Rational object instead of performing a division
<UmbralRaptor>
interesting
<_whitenotifier-6f89>
[Principia] pleroy synchronize pull request #2003: New parameters for Trappist optimization - https://git.io/fpPma
<B787_300>
UmbralRaptor: you see the thing about 2018 VG18?
<UmbralRaptor>
Is that the new 200 km ish thing that was recently announced?
<B787_300>
500 km dia
<UmbralRaptor>
ah
<B787_300>
Out at 120 AU or so
<B787_300>
My question is why will it take so long to nail down the orbit. Is it just a question of time on the super large telescopes?
<B787_300>
Because if you get enough measurements, especially from geographically diverse sites then even the slow movement should become apparent
<UmbralRaptor>
sufficiently large observation arc needed
<B787_300>
Ugh how I wish I had a copy of ODTK right now to mess around with it... I dont think you need that long of an observation arc
<UmbralRaptor>
Minimum period is 465 years. Hrm…
<UmbralRaptor>
(more plausibly >650 years)
<B787_300>
Characteristics of Orbit Determination with Short-Arc Observation by an Optical Tracking Network, OWL-Net (https://www.hindawi.com/journals/ijae/2018/2837301/) I mean this seems to show that orbit determination using a 5s observation of a Leo sat is pretty accurate
<B787_300>
Especially with a large number of observations
<B787_300>
Granted .0015 percent of 450 years is .7 years so that is the equivalent of a 5 sec ob of a 90 min Leo sat
<B787_300>
Sorry .007 years
<B787_300>
Which is only 3 days or so
<B787_300>
And yeah you cant look at it continuously for that time but the method should still hold if you decrease the time and increase the number of obs
<B787_300>
Plus if you do multiple sites and have good data on the distance between those sites and the angles they are pointing you should be able to get a pretty accurate pseudo range which would help drive down the uncertainty
<UmbralRaptor>
I'm getting 5 sec of 90 minutes as just under 1/1000
<UmbralRaptor>
So, 5 ish months for 450 years (0x120 au)
<B787_300>
I am just saying if we really cared we should be able to nail down its orbit faster than multiple years
<UmbralRaptor>
Yeah, I'd expect ~1 year max even for a circular orbit (O_o)
<SnoopJeDi>
B787_300, you can prepend "if we really cared" to a *lot* of stuff that's limited by observation time...
<B787_300>
Which leads me to think it is a factor of time on the big scopes as I would think you need a 2 m + scope to even hope of seeing it
<UmbralRaptor>
11 observations over 32 days o_O
* UmbralRaptor
stares at the JPL ephemeris. σ>μ much of the time O_o
<kmath>
<AndrewBarnas> Scientist goals I've not yet achieved but desperately want to: ⏎ 1. Burst into a room full of politicians while clutc… https://t.co/JBuxC4Lh1F
<bofh>
UmbralRaptor: uhhhhhhhhhhhhhhhhhhhhhhhhh at that ephemeris