[neo_followup] {MPML} Mars Perseverance astrometry

[Peter Birtwhistle]

Hi Patrick,

You can put the astrometry from Bill's page 
https://www.projectpluto.com/pluto/mpecs/20052b.htm into FindOrb and 
generate an ephemeris for the booster.

For you at 718 it is currently about 33 arcmin W and 6 arcmin N of the 
probe.

Peter
J95


On 31/07/2020 08:03, Wiggins Patrick wrote:
> Ephemerides on JPL Horizons for the spacecraft are spot on.  I’m tracking it now.
>
> Anyone here know if the booster is also on Horizons?  (I looked but no luck.)
>
> Alternatively, how far and in what direction is the booster currently away from the spacecraft?
>
> Thanks!
>
> patrick
> 718
>
>> On 30 Jul 2020, at 08:30, Bill J. Gray <pluto at projectpluto.com> wrote:
>>
>> Hi folks,
>>
>>    My third and last request for data on a Mars mission...
>>
>>    We have nominal ephemerides for the spacecraft from JPL's
>> Horizons system :
>>
>> https://ssd.jpl.nasa.gov/?horizons_news
>>
>>    Observability should resemble that for Tianwen-1 and EMM;
>> the objects will be in the same general area of the sky,
>> reasonably easy to observe for Northern Hemispherians.  As
>> with those two earlier missions,  we'll have to figure out
>> where the boosters are (and any other bits that fall off)
>> ourselves.
>>
>>    As far as I know,  no Mars mission hardware has come back
>> and been observed.  But except for the bits that stay at Mars,
>> the rest is usually in an orbit where it could come back and
>> be observed,  and we probably couldn't tell that it wasn't
>> a rock;  the speed would resemble that of a natural object.
>> For example,  if Tianwen-1 should fail for any reason,  it'll
>> be quite visible from the Southern Hemisphere in July 2023.
>> So your data matters.
>>
>> -- Bill
>>
>>
>>
>
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