Re: Mid-Winter Mid-Night Satellite Observation

From: Alain Figer via Seesat-l <seesat-l_at_satobs.org>
Date: Tue, 9 Jan 2018 11:17:09 +0100
At first glance I noticed, using Calsky, that Falcon 9 rocket , 2017-025B ,
#42699 , might be your satellite.
However I didn't spent much time on this case, I didn't yet watch the
video, hence my best guess has still to be confirmed by another observer.

From the MMT data (astroguard russian site) 2017-025B rotation period was
measured at 89.55s  on 13 OCT 2017. That figure seems to me in rather good
agreement  with yours at 102.4s, since the rotation period of this rocket
might be quickly lengthening, a rather classical behaviour for such newly
launched rockets.

According to Calsky the orbit is : 430.8 x 69785 km, 23.36h  Inclination:
25.6°
On 5 JAN 2018 at 5h50m UT, according to Calsky : "Altitude = 63634 km ; mag
13.0 ; h: 65.25° ; az 216.16° SW ;
Angular velocity, equatorial: vAngEqu = 0.06'/s horizontal: vAngAz =
0.20'/s"

For estimating the satellite altitude from your own observations you have
to consider its highly eccentric elliptical orbit.

Greetings
Alain Figer
48.67°N ; 2.13° E ; 170m a.s.l.

2018-01-09 9:02 GMT+01:00 David Oesper via Seesat-l <seesat-l_at_satobs.org>:

> While attempting to observe an asteroid occultation last Thursday evening,
> I serendipitously recorded a very slow moving satellite crossing the field
> in Taurus, only a few minutes before local midnight.  Here are the details
> of my observation and some primitive attempts at estimating the orbital
> distance:
>
> http://cosmicreflections.skythisweek.info/2018/01/09/mid-winter-mid-night-
> satellite/
>
> I would be most appreciative if someone could identify this satellite, as
> it seems a rather unusually distant object.  Tumbling, too!
>
> Feel free to post comments to my blog and/or here on SeeSat-L.
>
> Thank you!
>
> David Oesper
> Dodgeville, Wisconsin USA
> _______________________________________________
> Seesat-l mailing list
> http://mailman.satobs.org/mailman/listinfo/seesat-l
>
_______________________________________________
Seesat-l mailing list
http://mailman.satobs.org/mailman/listinfo/seesat-l
Received on Tue Jan 09 2018 - 10:17:09 UTC

This archive was generated by hypermail 2.3.0 : Tue Jan 09 2018 - 10:18:04 UTC