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

From: Nico Janssen via Seesat-l <seesat-l_at_satobs.org>
Date: Sun, 25 Jul 2021 20:26:17 +0200
Radio tracking confirms that the latest TLE set for Nauka is
correct within seconds.

The next maneuvers are planned for 27 July.

NJ

On 25-07-2021 19:36, Leo Barhorst wrote:
> 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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Received on Sun Jul 25 2021 - 13:27:15 UTC

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