Re: Starlink sat data times off?

From: George Roberts via Seesat-l <seesat-l_at_satobs.org>
Date: Wed, 5 Jun 2019 14:33:38 -0400
Well I looked at Starlink sats 2 nights ago around midnight and I only 
saw 2.  One was quite bright - around mag 2.  The other was hard to see 
even in binoculars and mag 3 skies.  I would say it was around mag 6.  
Didn't compare to any known nearby stars.  Maybe next time.

One thing I noticed was that the "leader" starlink on heaven's above was 
just a few minutes *after* the trailer so I think the leader had 
"lapped" the trailer.  Sort of.  I also noticed that the starlink 
sattellites seem to be in 3 clumps now (well 2 nights ago) but getting 
more spread out.

I'm not sure if they are all out of position on HA or if most of them 
were too faint to see.  I suspect both but mostly that they are getting 
faint. I watched (with binoculars) during a time window (about 20 
mintues) when I should have seen about 15 Starlinks but only saw the 2.  
I saw a few non-starlinks as well but they were obviously going the 
wrong direction and were visible on the HA phone app (I love that app).

- George


On 6/5/19 1:20 PM, Dr. T.S. Kelso via Seesat-l wrote:
> I should have noted that as of right now, all TLEs for the Starlink launch are between 2.76-2.82 days old, which certainly doesn’t help.  - TS
>
> https://celestrak.com/NORAD/elements/active.php
>
> Dr. T.S. Kelso
> CelesTrak, https://celestrak.com
> E-Mail: ts.kelso_at_celestrak.com<mailto:ts.kelso_at_celestrak.com>
>
> On 2019 Jun 05, at 17:18, Kelso, Dr. T.S. <ctskelso_at_agi.com<mailto:ctskelso_at_agi.com>> wrote:
>
> It seems 18 SPCS is having difficulty tracking and updating the orbits as SpaceX uses ion propulsion to maneuver to their operational orbits. I have received several reports of late (many minutes) passes and experienced this myself on May 30.
>
> Like you, I set up a camera to take 1-sec exposures at 5-sec intervals using an 18mm f/2.8 lens to get a big chunk of the sky. I got nothing in any of the shots from when the satellites should have entered to after they should have left the field of view. I just happened to swing the camera slightly to the south to get a shot of the Milky Way a couple of minutes later and caught 5 Starlink satellites. HA had predicted VM 3.0 but even the ones I caught seemed significantly dimmer.
>
> We expected there would be problems with tracking these types of maneuvers and are only now seeing how much. It’s not clear whether it is a systemic problem or simply compounded by trying to do that for 60 satellites.  - TS
>
> Dr. T.S. Kelso
> CelesTrak, https://celestrak.com<https://celestrak.com/>
> E-Mail: ts.kelso_at_celestrak.com<mailto:ts.kelso_at_celestrak.com>
>
> On 2019 Jun 05, at 02:39, Michael Boschat via Seesat-l <seesat-l_at_satobs.org<mailto:seesat-l_at_satobs.org>> wrote:
>
> Hi:
>
>
> Tried 2 times tonight to look for Starlink..  Heavens-Above had  for Halifax, Nova Scotia, Canada N44 W63  these 2 times for leader sat about 5 th mag.
>
> 21:18  and again at 23:18 local time.  I set camera up and began firing off 30 sec exposures and even used my old 7x35's to look for it and saw  and recorded nothing
>
> for both passes.
>
>
> Are the times of the passes off by minutes?   cannot figure it out.
>
>
>
> Clear skies
> ----------
> Michael Boschat
> Halifax Center - Royal Astronomical Society of Canada
>
>
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Received on Wed Jun 05 2019 - 13:43:36 UTC

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