[neo_followup] {MPML} EMM (Hope) tracking : spacecraft, booster, two other objects

[Patrick Wiggins]

Hi Bill,

I’ve measured hundreds of MPs but this is my first time measuring a spacecraft.

Appended below are the data for most of the images I used to construct the animation I mentioned earlier.

Again, first time measuring a spacecraft so I’ll not be offended if someone finds anything wrong with my data.

patrick
718


> On 20 Jul 2020, at 18:23, Bill J. Gray <pluto at projectpluto.com> wrote:
> 
> Hi folks,
> 
>   I've received astrometry from Masayaki Suzuki for the EMM booster,  as
> seen from (U69) Auberry in California;  from Peter Birtwhistle;  and from
> another observer who would prefer I not distribute astrometry quite yet,
> as the data aren't quite final.  But that extra data confirms that the
> following should produce good ephemerides.
> 
>   Peter got not only the booster,   but the spacecraft and other objects
> all at close range.  My guess is that the spacecraft and booster should be
> easy to find tonight,  with the booster visible for days.  The other objects
> are getting a little faint and are probably lost at this point.
> 
>   The booster data show some "maneuvering" as venting of leftover propellant
> (I assume) took place.  Putting together Masayaki Suzuki's data with the last
> two observations from (J95) gets results that should be good to a few
> arcminutes.  (Peter got plenty of earlier data,  but the venting caused
> large residuals when combined with Masayuki's data.)  Cut and paste the
> following into Find_Orb (on-line or "local"), and you should be able to
> generate ephemerides for the booster.  (The program will automatically combine
> the 80-column and ADES data.  I added some synthetic observations to help the
> program find the correct orbit.)


     EMM      C2020 07 20.34929 00 37 55.15 +25 38 51.6          16.8        718
     EMM      C2020 07 20.34975 00 37 55.76 +25 39 07.1          17.1        718
     EMM      C2020 07 20.35021 00 37 56.34 +25 39 21.4          17.0        718
     EMM      C2020 07 20.35044 00 37 56.55 +25 39 29.7          16.9        718
     EMM      C2020 07 20.35066 00 37 56.82 +25 39 36.9          16.9        718
     EMM      C2020 07 20.35089 00 37 57.06 +25 39 44.7          16.9        718
     EMM      C2020 07 20.35134 00 37 57.62 +25 39 59.9          17.2        718
     EMM      C2020 07 20.35159 00 37 57.87 +25 40 07.4          17.1        718
     EMM      C2020 07 20.35204 00 37 58.39 +25 40 21.7          17.0        718
     EMM      C2020 07 20.35250 00 37 58.85 +25 40 36.6          17.1        718
     EMM      C2020 07 20.35273 00 37 59.16 +25 40 44.4          17.0        718
     EMM      C2020 07 20.35295 00 37 59.32 +25 40 52.6          17.1        718
     EMM      C2020 07 20.35318 00 37 59.59 +25 40 59.0          17.2        718
     EMM      C2020 07 20.35341 00 37 59.87 +25 41 05.9          17.1        718
     EMM      C2020 07 20.35363 00 38 00.09 +25 41 13.5          17.0        718
     EMM      C2020 07 20.35386 00 38 00.32 +25 41 20.7          17.0        718
     EMM      C2020 07 20.35409 00 38 00.54 +25 41 28.0          17.2        718
     EMM      C2020 07 20.35454 00 38 01.12 +25 41 42.9          17.0        718
     EMM      C2020 07 20.35477 00 38 01.30 +25 41 49.8          16.9        718
     EMM      C2020 07 20.35500 00 38 01.54 +25 41 56.5          16.9        718
     EMM      C2020 07 20.35523 00 38 01.77 +25 42 05.2          16.9        718
     EMM      C2020 07 20.35545 00 38 02.01 +25 42 11.6          17.1        718
     EMM      C2020 07 20.35568 00 38 02.28 +25 42 18.8          16.9        718
     EMM      C2020 07 20.35591 00 38 02.49 +25 42 27.2          17.2        718
     EMM      C2020 07 20.35615 00 38 02.78 +25 42 32.6          17.0        718
     EMM      C2020 07 20.35660 00 38 03.21 +25 42 47.6          17.1        718
     EMM      C2020 07 20.35706 00 38 03.66 +25 43 02.3          16.9        718
     EMM      C2020 07 20.35728 00 38 03.90 +25 43 10.2          17.0        718
     EMM      C2020 07 20.35751 00 38 04.11 +25 43 16.9          17.2        718
     EMM      C2020 07 20.35775 00 38 04.40 +25 43 25.2          17.1        718
     EMM      C2020 07 20.35798 00 38 04.52 +25 43 30.5          17.2        718
     EMM      C2020 07 20.35820 00 38 04.81 +25 43 39.2          17.1        718
     EMM      C2020 07 20.35843 00 38 05.02 +25 43 45.4          17.1        718
     EMM      C2020 07 20.35866 00 38 05.30 +25 43 51.9          16.9        718
     EMM      C2020 07 20.35911 00 38 05.70 +25 44 06.6          17.0        718
     EMM      C2020 07 20.35957 00 38 06.15 +25 44 21.0          16.9        718
     EMM      C2020 07 20.35979 00 38 06.35 +25 44 28.2          17.3        718
     EMM      C2020 07 20.36002 00 38 06.59 +25 44 34.7          17.2        718
     EMM      C2020 07 20.36025 00 38 06.84 +25 44 42.3          17.1        718
     EMM      C2020 07 20.36047 00 38 07.03 +25 44 49.0          17.1        718
     EMM      C2020 07 20.36071 00 38 07.20 +25 44 57.0          16.8        718
     EMM      C2020 07 20.36162 00 38 08.08 +25 45 24.5          17.1        718
     EMM      C2020 07 20.36184 00 38 08.25 +25 45 31.1          17.2        718
     EMM      C2020 07 20.36207 00 38 08.49 +25 45 37.6          17.0        718
     EMM      C2020 07 20.36229 00 38 08.73 +25 45 44.9          17.3        718
     EMM      C2020 07 20.36252 00 38 08.97 +25 45 51.7          17.0        718
     EMM      C2020 07 20.36275 00 38 09.17 +25 45 58.7          17.2        718