[neo_followup] {MPML} Tianwen-1 guesstimated orbit

[Patrick Wiggins]

Here’s what I got this morning despite lots of clouds.  (I’ve posted an animation made from the images to my Facebook page https://www.facebook.com/patrick.wiggins.71 )

patrick
718

     Tianwen1  C2020 07 25.44727 00 52 28.46 +16 07 18.0          16.9        718
     Tianwen1  C2020 07 25.44766 00 52 28.30 +16 07 18.1          16.8        718
     Tianwen1  C2020 07 25.44883 00 52 27.80 +16 07 21.0          16.8        718
     Tianwen1  C2020 07 25.44922 00 52 27.64 +16 07 21.9          16.9        718
     Tianwen1  C2020 07 25.44960 00 52 27.50 +16 07 22.5          16.7        718
     Tianwen1  C2020 07 25.44999 00 52 27.33 +16 07 23.6          16.8        718
     Tianwen1  C2020 07 25.45117 00 52 26.85 +16 07 25.6          16.8        718
     Tianwen1  C2020 07 25.45155 00 52 26.68 +16 07 26.5          16.8        718
     Tianwen1  C2020 07 25.45194 00 52 26.54 +16 07 26.9          16.9        718
     Tianwen1  C2020 07 25.45350 00 52 25.87 +16 07 30.3          16.7        718
     Tianwen1  C2020 07 25.45389 00 52 25.70 +16 07 31.2          16.8        718
     Tianwen1  C2020 07 25.45427 00 52 25.56 +16 07 31.8          16.9        718
     Tianwen1  C2020 07 25.45466 00 52 25.39 +16 07 32.7          16.7        718
     Tianwen1  C2020 07 25.45584 00 52 24.95 +16 07 34.5          16.9        718
     Tianwen1  C2020 07 25.45623 00 52 24.76 +16 07 35.6          16.7        718
     Tianwen1  C2020 07 25.45662 00 52 24.59 +16 07 36.1          16.8        718
     Tianwen1  C2020 07 25.45701 00 52 24.42 +16 07 37.2          16.8        718
     Tianwen1  C2020 07 25.45817 00 52 23.93 +16 07 39.3          16.7        718
     Tianwen1  C2020 07 25.45856 00 52 23.77 +16 07 40.5          16.7        718


> On 23 Jul 2020, at 12:06, Bill J. Gray <pluto at projectpluto.com> wrote:
> 
> Hi folks,
> 
>   Cut-and-paste the following synthetic "observations" into
> Find_Orb,  and you should be able to get ephemerides for this
> object which,  I hope,  will not be too laughably wrong.
> 
>   I'm working from limited data here.  I know when the object
> was launched,  and I am reasonably certain that it went into an
> orbit with an inclination of about 30 degrees.  At the southern
> end of that orbit about 40 minutes later,  it then accelerated
> into an orbit that should get it to Mars in mid-February 2021
> (the orbit below corresponds to arriving on 2021 Feb 17).
> 
>   Given that guesswork,  ephemerides computed from this may be
> right on the nose.  Or they could be several degrees off;  I
> really have almost no way of knowing,  given the usual lack of
> information from the China National Space Agency.
> 
>   I added a magnitude to give us an H=27 object,  which should
> match the booster pretty well;  the spacecraft itself is apt
> to be several magnitudes fainter.
> 
> -- Bill
> 
>    Tianwen1  C2020 07 23.90000000 34 35.409+27 16 00.63                SynthJ95
>    Tianwen1  C2020 07 24.00000000 36 06.923+27 39 55.95                SynthJ95
>    Tianwen1  C2020 07 24.10000000 36 15.306+27 56 26.04                SynthJ95
> 
>    Tianwen1  C2020 07 24.20000000 39 33.283+27 53 19.52                Synth703
>    Tianwen1  C2020 07 24.30000000 40 19.638+28 11 24.54                Synth703
>    Tianwen1  C2020 07 24.40000000 39 50.006+28 24 18.52                Synth703
>    Tianwen1  C2020 07 24.50000000 38 45.602+28 29 27.62                Synth703
> 
>    Tianwen1  C2020 07 23.70000000 30 34.371+26 59 43.86                SynthC42
>    Tianwen1  C2020 07 23.80000000 32 10.944+27 35 22.19                SynthC42
>    Tianwen1  C2020 07 23.90000000 32 03.001+27 55 08.90                SynthC42
> 
>    Tianwen1  C2020 07 23.70000000 31 32.802+27 09 40.91                SynthN55
>    Tianwen1  C2020 07 23.80000000 33 16.512+27 47 35.50                SynthN55
>    Tianwen1  C2020 07 23.90000000 32 51.951+28 09 23.93         15.9 V SynthN55
> 
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