(no subject)

From: C. Bassa via Seesat-l <seesat-l_at_satobs.org>
Date: Mon, 14 Mar 2016 21:21:14 +0100
Hi all,

ExoMars was seen from the Netherlands just after the end of the escape
burn. Moonlit clouds made for a difficult observation.

The track was on time with the 99005 elset, but was halfway between
the 99004 and 99003 elsets in position.

Here is a stacked picture showing the track in two 10s exposures:
https://db.tt/Z4xdbv9A

Good luck for those further South!

Regards,
    Cees

On Mon, Mar 14, 2016 at 7:40 PM, C. Bassa <cgbsat_at_gmail.com> wrote:
> An object [41390/16017C] from the ExoMars launch has been catalogued
> in the transfer orbit; 697x21088km _at_ 51.6deg. This could be the APT
> (Auxiliary Propellant Tank), or the Briz-M with ExoMars.
>
> Using this orbit, and allowing for some range in the argument of
> perigee, I've taken the position and velocity around the 4th Briz-M
> burn at 19:54UT, and increased the velocity vector by a factor
> 1.1. This increases the apogee to about 173000 km (e=0.93) and should
> be representative for the escape orbit for the first 6 hours or so
> after the escape burn.
>
> The resulting elsets are below. The 99005 elset is closest to the
> JSpOC elset of object 41390 and should be used as a reference. The
> other elsets are to indicate the possible offsets in position and
> time. There is some uncertainty in the timing, mainly because I apply
> the velocity instantly, whereas in reality the burn takes several
> minutes. On top of that there is the uncertainty in whether object
> 41390 is the payload or the APT.
>
> Observers in Europe will have good visibility shortly after the escape
> burn. Observers in Africa will be able to track the probe quite a way
> out.
>
> Regards,
>    Cees
>
> 1 99000U 14999A   16074.82916667  .00000000  00000-0  00000-0 0    06
> 2 99000  51.5921 322.7904 9266574  89.7355 359.0806  0.30343002    02
> 1 99001U 14999A   16074.82916667  .00000000  00000-0  00000-0 0    07
> 2 99001  51.6219 322.7970 9268417  91.7169 359.1409  0.30358388    04
> 1 99002U 14999A   16074.82916667  .00000000  00000-0  00000-0 0    08
> 2 99002  51.6513 322.8065 9270144  93.6955 359.2056  0.30372495    06
> 1 99003U 14999A   16074.82916667  .00000000  00000-0  00000-0 0    09
> 2 99003  51.6800 322.8188 9271740  95.6714 359.2744  0.30385852    05
> 1 99004U 14999A   16074.82916667  .00000000  00000-0  00000-0 0    00
> 2 99004  51.7080 322.8339 9273200  97.6449 359.3469  0.30398115    06
> 1 99005U 14999A   16074.82916667  .00000000  00000-0  00000-0 0    01
> 2 99005  51.7350 322.8516 9274525  99.6159 359.4228  0.30409108    04
> 1 99006U 14999A   16074.82916667  .00000000  00000-0  00000-0 0    02
> 2 99006  51.7609 322.8719 9275706 101.5848 359.5017  0.30418758    05
> 1 99007U 14999A   16074.82916667  .00000000  00000-0  00000-0 0    03
> 2 99007  51.7855 322.8947 9276737 103.5514 359.5833  0.30427313    02
> 1 99008U 14999A   16074.82916667  .00000000  00000-0  00000-0 0    04
> 2 99008  51.8088 322.9199 9277616 105.5162 359.6671  0.30434519    07
> 1 99009U 14999A   16074.82916667  .00000000  00000-0  00000-0 0    05
> 2 99009  51.8306 322.9473 9278335 107.4791 359.7529  0.30440638    06
> 1 99010U 14999A   16074.82916667  .00000000  00000-0  00000-0 0    07
> 2 99010  51.8507 322.9768 9278900 109.4404 359.8401  0.30445172    07
_______________________________________________
Seesat-l mailing list
http://mailman.satobs.org/mailman/listinfo/seesat-l
Received on Mon Mar 14 2016 - 15:21:57 UTC

This archive was generated by hypermail 2.3.0 : Mon Mar 14 2016 - 20:21:57 UTC