Re: Nauka orbit not updated for over a day (SATOBS ML (4353) VIDEO, 23 Jul 2021: Nauka)

From: Leo Barhorst via Seesat-l <seesat-l_at_satobs.org>
Date: Sun, 25 Jul 2021 19:36:01 +0200
Hello,

Just saw a new TLE for Nauka on Space-Track for day 206, that is today.


I will have a high elevation pass later this evening and will try do
make an obs, weather permitting.

Leo

Op zo 25 jul. 2021 om 14:22 schreef Nico Janssen via Seesat-l
<seesat-l_at_satobs.org>:
>
>
> My interpretation was not correct: last night (UTC) Nauka was
> already about 11 minutes late. So today it will be much later
> than that.
>
> NJ
>
> On 25-07-2021 13:28, Nico Janssen via Seesat-l wrote:
> >
> > If my interpretation of available radio tracking data is correct,
> > then Nauka is now some 100 s late on its latest TLEs. After
> > 17:00 UTC today I may have better data. But by that time
> > new TLEs may have been published.
> >
> > NJ
> >
> > On 25-07-2021 13:18, Marco Langbroek via Seesat-l wrote:
> >> Hi all,
> >>
> >> It seems 18 SpCS is having trouble providing Space-Track with updates
> >> on the
> >> orbits of Nauka and the Proton rb. The last available elements are
> >> over 1.25
> >> days old now.
> >>
> >> This is very annoying, as all of us are holding our breath to see if
> >> the series
> >> of orbit manoeuvres succeed, after the recent trouble experienced
> >> with the Nauka
> >> engines.
> >>
> >> This also means that we as an amateur community might be able to step
> >> in and
> >> update, for the public, Nauka's orbit.
> >>
> >> As a starter, below are my obs from the evening of 23 July (July 24 was
> >> unfortunately clouded out). If more of us provide astrometry, we can
> >> update the
> >> orbit.
> >>
> >> As an interesting aside, showing that our amateur data are actualy
> >> usefull:
> >> yesterday I was at the SpaceTech Symposium at ESTEC in Noordwijk,
> >> where I did a
> >> talk about our amateur tracking work that was very well recieved.
> >> One of the ESA people told me that back in 2007-2008 they were very
> >> happy to
> >> have our amateur orbit determinations on USA 193, as that was their
> >> only source
> >> at the time to asses where it was. This was relevant to them because
> >> it was at
> >> low altitude and they had an ATV launch planned for March 2008
> >> (eventually, USA
> >> 193 was shot down before that date).
> >>
> >> My July 23 data on Nauka:
> >>
> >> 49044 21 066A   4353 G 20210723211149061 15 75 1526343+268550 85 S
> >> 49044 21 066A   4353 G 20210723211151021 15 75 1538233+271190 85 S
> >> 49044 21 066A   4353 G 20210723211217060 15 75 1834276+231600 85 S
> >> 49044 21 066A   4353 G 20210723211219020 15 75 1846158+223680 85 S
> >> 49044 21 066A   4353 G 20210723211224260 15 75 1914514+201950 85 S
> >> 49044 21 066A   4353 G 20210723211226220 15 75 1924362+193590 85 S
> >> 49044 21 066A   4353 G 20210723211148021 56 75 1520205+266902 16 S
> >> 49044 21 066A   4353 G 20210723211148261 56 75 1521444+267172 16 S
> >> 49044 21 066A   4353 G 20210723211149021 56 75 1526160+268539 16 S
> >> 49044 21 066A   4353 G 20210723211149100 56 75 1526431+268496 16 S
> >> 49044 21 066A   4353 G 20210723211209901 56 75 1747579+256360 16 S
> >>
> >> -----------------------------------------------------------------------------
> >>
> >> WATEC 902H2 Supreme + Zeiss 1.4/35 mm + GPS time inserter + TANGRA
> >> software*
> >> What these numbers mean: http://www.satobs.org/position/IODformat.html
> >> -----------------------------------------------------------------------------
> >>
> >> * AstroRecord used instead for several points
> >>
> >>
> >> Tangra, the software I normally use for my video astrometry had
> >> trouble fitting
> >> to such a bright object, so most of the points above were obtained
> >> from short
> >> video stacks which I measured manually using AstroRecord, the software I
> >> normally use for measuring photographs. residuals with respect to the
> >> last
> >> available orbit from Space-Track, orbit 21205.20509545, are fine: rms
> >> 0.021 deg.
> >>
> >> - Marco
> >>
> >>
> >> -----
> >> Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
> >> e-mail: sattrackcam_at_langbroek.org
> >>
> >> Cospar 4353 (Leiden):     52.15412 N, 4.49081 E (WGS84), +0 m ASL
> >> Cospar 4355 (Cronesteyn): 52.13878 N, 4.49937 E (WGS84), -2 m ASL
> >> Station (b)log: http://sattrackcam.blogspot.com
> >> Twitter: _at_Marco_Langbroek
> >> -----
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> >
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Received on Sun Jul 25 2021 - 12:37:19 UTC

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