Re: Starlink magnitudes-550km update2

From: Leo Barhorst via Seesat-l <seesat-l_at_satobs.org>
Date: Mon, 15 Jul 2019 13:47:02 +0200
For observers in NW Europe the Starlink sats become visible before
dawn in next few days.
On Jul 18 some reach elevation 20 deg about half an hour before dawn.
On Jul 21 morning a lot of them reach 25 deg elevation after 01 UT.
It will get better in the days there after.

Now we hope for some clear weather to observations

Leo

2019-07-15 12:11 GMT+02:00, td Fax via Seesat-l <seesat-l_at_satobs.org>:
> apologies hit enter too early...
> I've reduced and solved my first videos mentioned, just need to do magnitude
> analysis now.
> The videos' exposure was done well, so I can examine the luma values with
> waveform and brightness adjust and compare to known stars to get a decent
> measure...
> My first outing I captured about 1/3 of them.
>
> On a second most recent outing I captured about 55 of them.  Magnitudes
> varied just from mid 3's to much dimmer. Details still to come.
>
> Since the orbital plane with the Earth rotating under it has a corkscrew
> effect across the sky,
> Phase angles necessarily changes over the sample of all 60....
>
> So on the one hand with such combinations I estimate there will be no
> 'normative' pass magnitude on a given night,
> while on the other, an examination of the 60 over 90 minutes will show a
> range of possibilities, as was obvious from my recent obs....
>
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>  On Saturday, July 13, 2019, 1:40:53 PM UTC, Jonathan McDowell
> <planet4589_at_gmail.com> wrote:
>
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>
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>
>  Paul Maley's obs was the only report until yours. Mag 4 is a bit worrying;
> I lookforward to more details. Thanks  Jonathan
>
> On Sat, 13 Jul 2019 at 06:21, td Fax <cofj1_at_yahoo.com> wrote:
>
>  Any feedback received yet?
> FWIW,I was able to catch recent video of a number of Starlink
> satellites.Didn't have 1.5 hours to capture all of them.I haven't reduced my
> data yet,but tracking them realtime comparing software sim on my tablet and
> looking at live display of my camera feed,easily safe to say they were
> definitively brighter than mag. 4 compared with known nearby star
> values.There passes didn't look noticeably different that the videos I've
> taken of their passes prior to final 550m orbit.
>
> I did notice some elements were spot-on and some of them were late or early,
> all with recent TLEs all with same day epochs....More details later.
>
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>  On Saturday, June 29, 2019, 5:22:33 PM EDT, Jonathan McDowell
> <planet4589_at_gmail.com> wrote:
>
>
>
>
>  On Friday, June 28, 2019, 1:32:32 PM EDT, Jonathan McDowell via Seesat-l
> <seesat-l_at_satobs.org> wrote:
>
>
>
>
>
>  As of about a week ago the bulk of the Starlink satellites have reached
> their
> final orbit. To help the astronomical community assess the impact of a full
> Starlink
> constellation, I would like to formally request visual magnitude estimates
> of Starlink payloads  (EXCLUDING the debris objects 44295-44298, BN to BR)
> for dates after June 20.  Mainly looking for their steady brightness but
> also interested
> in comments on any flaring behaviour.
>   - Jonathan McDowell, Center for Astrophysics
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Received on Mon Jul 15 2019 - 06:47:47 UTC

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