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
<CursedRaptor>
So we got 0 observations of the target star
<egg>
ow
<CursedRaptor>
Also, the telescope is probably inoperable for a while.
<CursedRaptor>
This meant fun things like the observatory director walking me through some troubleshooting steps, and then how to manually close the dome.
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[Principia] eggrobin commented on issue #2074: An API to get geopotential coefficients for analytic perturbation theories - https://git.io/fh5gx
<egg>
CursedRaptor: were hadrosaurs involved
<CursedRaptor>
The dome was loud enough that there might have been.
<egg>
<bofh> (i.e. I got distracted but I found the references I was looking for, so maybe another hour TT?) << haha
<_whitenotifier>
[Principia] eggrobin opened pull request #2079: Geopotential API - https://git.io/fh52o
<egg|zzz|egg>
bofh: do you know whether there are SP3 files for GNSS satellites with V records and not just P records?
<egg|zzz|egg>
I can find mentions of SP3 velocities in "GPS Satellite Velocity and Acceleration Determination using the Broadcast Ephemeris" but I can't find any SP3 with velocities for those satellites?!!
<kmath>
<WalrockHomebrew> Though the Opportunity rover has gone on to robot heaven, it can live on in your #dnd game. ⏎ ⏎ Here's a fairly-accura… https://t.co/5Y8qWrwyrG
<egg>
bofh: I'm surprised there aren't any V records in the IGS data
<egg>
bofh: this has plenty of SP3-c files, but they're all P only ftp://cddis.nasa.gov/gnss/products/
<egg>
bofh: what's the difference between the pe and apc solutions? ftp://ftp.nga.mil/pub2/gps/pedata/2019pe/nga20342.eph vs. ftp://ftp.nga.mil/pub2/gps/apcpe/2019apc/nga20342.apc
<egg|zzz|egg>
"Note: Unlike the IGS igs15681.sp3 file, the satellite coordinates in the apc15681 file are relative to the satellite’s APC. Therefore, the APC correction must be applied to the IGS file to relate both coordinates to their respective APC."
<egg|zzz|egg>
ah, that's what the SATCOM and SATAPC in the comment lines mean
<egg|zzz|egg>
bofh: e.g. here in the com* files, there are positions for all of GPS, ГЛОНАСС, and Galileo, but no velocities ftp://igs.ensg.ign.fr/pub/igs/products/mgex/1700/
<egg|zzz|egg>
!acr -add:KASI Korea Astronomy and Space science Institute
<galois>
Definition added!
egg|zzz|egg has quit [Ping timeout: 202 seconds]
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<egg|zzz|egg>
!acr -add:PRN Pseudo-Random Noise
<galois>
Definition added!
<egg|zzz|egg>
bofh: do you think it is meaningful to interpolate the velocities by a high-order difference formula from those P-only SP3 files?
<egg|zzz|egg>
(they have data every 15 min)
<egg|zzz|egg>
!acr -add:NAVSTAR NAVigation System using Timing And Ranging
<bofh>
is there much of a difference between an APC and a Centre-of-Mass one? Yes I know what the difference is, and I think you'd be interested in the latter and me in the former, but from what I can tell the ccorrection is of a very smol magnitude?
<bofh>
14:21:39 < egg|zzz|egg> bofh: do you think it is meaningful to interpolate the velocities by a high-order difference formula from those P-only SP3 files?
<bofh>
should be meaningful, I mean they're... hourly? or apparently even every 5 mins?!?
<egg|zzz|egg>
is there much of a difference between an APC and a Centre-of-Mass one? well you can compare them yourself ftp://ftp.nga.mil/pub2/gps/pedata/2019pe/nga20342.eph vs. ftp://ftp.nga.mil/pub2/gps/apcpe/2019apc/nga20342.apc
<_whitenotifier>
[Principia] pleroy commented on issue #2063: Principia DLL failed to load - https://git.io/fh56M
<kmath>
<bofh453> Huh, I didn't know 𒀭𒉀 still lived among us & apparently was responsible for YAML's numeric parsing behaviour… https://t.co/7o3gtBWpNp
<egg>
<bofh> should be meaningful, I mean they're... hourly? or apparently even every 5 mins?!? << used to be every 15 min, now every 5 min from CODE for MGEX (but every 15 min for a lot of other stuff still)
<kmath>
<sigfig> me after skipping a meal: feelin great, energetic, starving has mysteriously cured all my ailments ⏎ ⏎ alice after ski… https://t.co/SeKHRaGB1Y
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[Principia] eggrobin 60d9122 - Merge pull request #2080 from pleroy/Linux Fix a link error found on Linux
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[Principia] eggrobin closed issue #2074: An API to get geopotential coefficients for analytic perturbation theories - https://git.io/fhQfk
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[Principia] eggrobin pushed 5 commits to master [+0/-0/±10] https://git.io/fh5yr
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[Principia] eggrobin 633e018 - Geopotential API
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[Principia] eggrobin 80daecb - after pleroy's review
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[Principia] eggrobin 381a8b1 - rename in the test too
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[Principia] ... and 2 more commits.
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<egg|zzz|egg>
bofh: should I use a difference formula on the ECEF positions to get ECEF velocities, or convert and differentiate the ECI positions to get ECI velocities
<egg|zzz|egg>
bofh: (not an urgent question since now I need to finally get around to writing an SP3 parser)
<egg|zzz|egg>
whitequark: do you like specs ftp://igs.org/pub/data/format/sp3c.txt