Re: Mid-Winter Mid-Night Satellite Observation

From: David Oesper via Seesat-l <seesat-l_at_satobs.org>
Date: Wed, 10 Jan 2018 01:15:31 -0600
Thank you, Alain!  Looking into this a little further I discovered this evening that Guide 9.1 can easily display satellites, and I was able to make the same determination!  So, in the future I will be able to make the determination myself.  In the unlikely event I ever come across something not identifiable, I’ll post a message here.

Many thanks,

Dave

> On Jan 9, 2018, at 4:17 AM, Alain Figer <alain.figer_at_gmail.com> wrote:
> 
> 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 <mailto: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/ <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
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Received on Wed Jan 10 2018 - 01:16:18 UTC

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