Re: LB Obs 2020 Mar 24 am

From: C. Bassa via Seesat-l <seesat-l_at_satobs.org>
Date: Tue, 24 Mar 2020 13:38:40 +0100
Hi Leo,

On Tue, Mar 24, 2020 at 1:05 PM Leo Barhorst via Seesat-l
<seesat-l_at_satobs.org> wrote:
> Session started with an UNID that Satfit IDed as 36124 09 073A with low
> residuals; see below. Last seen 174 days ago. Cees also imaged it tonight.
> 36124 09 073A   4172 E 20200324015143022 17 25 0147558+704493 37 S
> 36124 09 073A   4172 E 20200324015150122 17 25 0154635+723485 37 S
> 36124 09 073A   4172 E 20200324015157501 17 25 0204462+743514 37 S

Note that I observed Helios 2A [28492/04049A] on the morning of the
23rd, and your positions for Helios 2B [36124/09073A] are also
consistent with those of Helios 2A.

The orbital planes of Helios 2A and Helios 2B are almost identical. I
based my identification on the fact that the last orbit of Helios 2A
gives slightly better residuals, and a smaller offset in the RA of the
Ascending node, when allowing for changes in the RA of the ascending
node and the mean anomaly. We'll know for sure when we also recover
Helios 2B.

Here is an orbit estimate for Helios 2A using your and my observations:
Helios 2A
1 28492U 04049A   20083.05223032  .00000000  00000-0  50000-4 0    04
2 28492  98.1874  20.6044 0003000 178.9438 299.9203 14.63822776    03
# 20200323.05-20200324.08, 9 measurements, 0.008 deg rms

Regards,
    Cees
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Received on Tue Mar 24 2020 - 07:39:34 UTC

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