Re: Starlink: request for magnitude observations

From: JAY RESPLER via Seesat-l <seesat-l_at_satobs.org>
Date: Tue, 17 Mar 2020 20:03:11 -0400
On 2/24/20 5:02 PM, Jonathan McDowell via Seesat-l wrote:
> DARKSAT (44932) has now reached its operational orbit. This would be a
> great time to report visual magnitudes for it and other Starlink
> satellites. As before, what I'm looking for is mainly catalog number,
> visual magnitude, obsever location and time, plus ideally the rest of the
> usual
> SeeSat reporting data so we can estimate how illuminated it should have
> been.
>     I'm also interested in negative reports from experienced observers
> (satellite #such-and-such not seen at given time). And especially
> interested in any cases where they are seen when *not* predicted to be in
> sunlight (there have been anecdotal cases but I'm not sure I believe them)
>   Last summer's campaign was very successful - thanks to all the observers
> esp. the prolific Jay Respler. Can we do it again?
>
>    - Jonathan McDowell,  Center for Astrophysics
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I just got my scope partially set up and have started looking for all 
sats brighter than mag 11.   Haven't used the scope in several years but 
can now expand my observing program.
I'll catch up with posting old Starlink obs here.
In the past, I cut out predicted mags and derived Intrinsic Magnitures 
and just reported observed mags. I'll leave them in from now on and 
include the Quicksat Intrinsic mag.
Each prediction has a name line followed by a prediction line.
For this group, default mag is 20 (equivalent to 4).   18.5=70 means 
predicted mag was 18.5, observed mag was 7.0.  Decimal point is omitted 
in my observed mags.
This gives an Intrinsic Mag of 8.5.   That is the "im=85" on the name 
line.  Some use a definition for IM that differs from Quicksat. As 
explained on Mike's site, that should just take a simple adjustment.

For clarity I'll only report Starlink obs.  All other objects will be 
removed.

   40.330  74.445  170.   JAY RESPLER Monroe NJ  2000 5.4 16 F F T T F

2019 Nov 23 Sat morn  *** Times are AM EST 1728  558
  H  M  S Tim Azi El C Dir  Mag Dys F  Hgt Shd  Rng  EW Phs  R A Dec
44776 FALCON DEB74BR 19-74BR im=85
  5 37 27     133 59  265 18.5=70 1 1  172  70  199 3.7 103 1121 16.5
44775 FALCON DEB74BQ 19-74BQ IM=53
  5 41 32     151 69  281 18.2=35 1 1  174  74  186 4.2  92 1035 20.9
44774 FALCON DEB74BP 19-74BP IM=89
  5 51  5     261 81   31 17.8=67 1 1  175  87  177 4.4  70  914 38.2
44749 STARLINK 1044 19-74AN IM=36
  5 52  0     222 82  351 18.3=19 1 9  212 129  214 3.7  75  935 34.0
44773 FALCON DEB74BN 19-74BN IM=77
  5 54 16     306 77   75 17.8=55 1 2  176  94  181 4.3  66  9 0 47.0

2019 Dec 3 Tue eve *** Times are PM EST 1725
Hrs Min  Azi  El  Mag    Hgt    R  A    Dec Range Phs
42071 FALCON 9 R/B 17014B  IM=0.7 M 2.0 ElDy 2 Dr 1109
  19  42  178  34  6.9=56 3394  0 40.7 -16.0   4370  69

2019 Dec 7 Sat morn  *** Times are AM EST 1724  612
44744 STARLINK 1039 19-74AH IM=38
  6  5 57      21 26    86 20.8=46 0 2 274 198  550 1.4  85 1921 68.1
44739 STARLINK 1034 19-74AC IM=39
  6  6 42      18 25    84 20.6=45 0 5 228 150  491 1.6  83 1953 68.2
44750 STARLINK 1045 19-74AP IM=37
  6  6 42      18 27    85 20.8=45 0 2 274 196  549 1.4  83 1937 69.6
44732 STARLINK 1027 19-74V IM=39
  6  7  5      20 24    85 20.6=45 0 4 223 149  483 1.6  85 1938 66.7
44733 STARLINK 1028 19-74W IM=39
  6  7 18      20 25    85 20.6=45 0 3 223 149  482 1.6  85 1938 66.8



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Received on Tue Mar 17 2020 - 19:04:06 UTC

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