5919 and Finnish obs

From: Björn Gimle via Seesat-l <seesat-l_at_satobs.org>
Date: Mon, 2 May 2016 00:11:33 +0200
I have received more images and information via Arto Oksanen of
observations Apr 12-21 in or near the predicted orbit plane of IGS 6 r.
Here are the site coordinates I have received so far (and used in analysis
in HeavenSat):

[6227 Hankasalmi, Arto Oksanen] 62.254400 26.596200 150 0
[6325 Arto Oksanen, Karstula] 62.880000 24.800000 150 0
[6525 Oulo] 65.074970 25.411310 33 0
[6324 Tuukkanen] 63.092300 24.746800 150 0

I have produced the following IOD observations:

55555 11 050B   6324 G 20160412225646000 57 25 1805011+045447 55 S
55555 11 050B   6324 G 20160412225702000 48 25 1817652+095409 55 S
55555 16 606A   6227 M 20160414003249000 57 25 1036483+451684 65 S
55555 16 606A   6227 G 20160414003344000 57 25 0750665+471734 65 S
55555 11 050B   6525 G 20160414003458000 47 25 0711863+431531 55 S
55555 16 606A   6227 M 20160421231748000 48 25 1233800+333000 65 S

However, all the images I have received are reduced size copies with poor
resolution, and in no case directly from the originator.
Exposure times are sometimes claimed to be to 1 s accuracy, but I don't
know if they really meant "precision", and there is no IPTC/EXIF info in
the images.
A lot of info is in forwarded Finnish text, even the only copy of EXIF info
I got.
Many of the obs lack start time of exposure, and/or length, and the
majority are from all-sky cameras with very few identifiable stars
sufficiently close to the tracks.

My attempt of orbit determinations lead me to propose they are in the same
orbit plane.
These two orbits were produced by ElObsEnt.exe to fit 20160412* and
20160414* , but they do not match 20160421* observation in time:
Also, this latter obs shows just a short flare, as opposed to the others
with sometimes a long flare before culmination, then fading normally
towards the N, in about two minutes.
And Arto was unable to find other similar passes in April !

IGS 6 UNID
1 55555U 11050B   16105.02342593  .00004044  00000-0  19433-3 0    04
2 55555  96.8920 241.4797 0200947 327.3169 102.4238 15.02735496    03
IGS 6 UNID
1 55555U 11050B   16105.02342593  .00002580  00000-0  19433-3 0    07
2 55555  96.9457 241.4685 0008487 149.9025 277.5928 15.02535232    05

Last night I found an object in a similar orbit. This one was slowly
tumbling (>20 s ?).

55558 16 621A   5919 F 20160430225901000 57 25 2259900+565370 57 S
55558 16 621A   5919 F 20160430225906000 57 25 2317000+575000 57 S

I intend to search for it if it stays clear, with this fabricated TLE:
IGS 6A r ?
1 55558U 16621B   16121.01096392 0.00003000  00000-0  19433-3 0    08
2 55558  97.7900 259.9100 0008400 150.5376 310.5700 15.08182000    05

Attaching an overview and notes of images and sites

--------------------------------------------------------
Björn Gimle, COSPAR 5919
59.2617 N, 18.6169 E, 51 m
Satellite observation formats described:
http://www.satobs.org/position/IODformat.html
---------------------------------------------------------

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Received on Sun May 01 2016 - 17:12:20 UTC

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