Re: BY Correction 72702

From: Alain Figer via Seesat-l <seesat-l_at_satobs.org>
Date: Fri, 15 Mar 2019 08:58:47 +0100
Hi Brad,

I agree with you that ISON 72702 was a wrong identification.
I had a no-show on 10 MAR 2019 during a long photographic survey at mag
13.5-14 based on your recent observation on 7 MAR. Further calculations
done by a friend of mine (jlx) proved a real misfit between the observed
satellite and ISON 72702.

Your newest candidate is now ISON 32000 = 2016-535A. It happens this is
also a satellite I attempted to observe on 26 FEB 2019.
From your observations ISON 32000 had an O-C of -36.7 minutes compared to a
TLE calculated only 12.4 days earlier (TLE corresponding to a  296.8 min
period and an orbit of 16 492 x 230.8 km).
An O-C was expected indeed for atmospheric drag (perigee of only about 230
km). But such an O-C of 36.7min seems to us a bit too large for a
reasonable fit  taking in account other data about the actual decreasing
period rate.

That's why we still find this identification as ISON 32000 somewhat
doubtful. New observations would be welcome.

Best regards
Alain Figer
Gometz: 48.67°N ; 2.13° E ; 170 m a.s.l.


Le mar. 12 mars 2019 à 03:45, Brad Young via Seesat-l <seesat-l_at_satobs.org>
a écrit :

> I posted:
>
> 90113 16 535A   7778 G 2019030710011898  17 25 1104865-153062 16
> 90113 16 535A   7778 G 2019030710021898  17 25 1106639-151647 16
> 72702 50 074A   7778 G 2019030710122797  17 25 1145062-171181 16 S+115 10
> 72702 50 074A   7778 G 2019030710132797  17 25 1146940-171643 16 S+115 10
>
> Other observers followed up and it is clear that the object reported as
> 72702 was actually 90113; 72702 is not as bright as hoped. Therefore, the
> correct reductions are:
>
> 72702 50 074A   7778 G 2019030710011898  17 25 1104865-153062 16
> 72702 50 074A   7778 G 2019030710021898  17 25 1106639-151647 16
>
> 90113 16 535A   7778 G 2019030710122797  17 25 1145062-171181 16 S+115 10
> 90113 16 535A   7778 G 2019030710132797  17 25 1146940-171643 16 S+115 10
>
> and 72702 is not very bright. Crowd sourcing works!
>
> Brad Young Visual:
> 10 x 50 binoculars
> Meade ETX-125
> 22" f/4.2 UC Obsession
> COSPAR 8336 =TULSA1 +36.139208,-95.983429 660ft, 201m
> COSPAR 8335 =TULSA2 +35.8311  -96.1411 1083ft, 330m
> Remote Imaging:
> MPC I89 COSPAR 7777 38.165653 -2.326735 5150ft, 1650m Nerpio, Spain
> MPC Q62 COSPAR 7778 -31.2733 149.0644 3400ft, 1122m Siding Spring, NSW,
> Australia
> MPC H06 COSPAR 7779 32.92 -105.528 7298ft, 2225m Mayhill, New Mexico USA
> MPC U69 COSPAR 7780 37.07 -119.4 4610ft, 1405m Auberry CA USA
> MPC 323 COSPAR 7782 -32.008 116.135 984ft, 300m Perth, WA, Australia
> MPC Q67 COSPAR 7784 -33.3967 149.4917 2081ft, 650m Bathurst NSW, Australia
>
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Received on Fri Mar 15 2019 - 07:58:47 UTC

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