Geosat Flare Festival from 4160 (BD) on 2012-10-12/13

From: Bram Dorreman (bram.dorreman@gmail.com)
Date: Mon Oct 15 2012 - 22:02:04 UTC

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    After sunset of October 12, 2012 the sky was partly clouded.
    Later that night clouds disappeared. According to a calculation
    performed many years before, this night is the one most suitable
    one for observing flaring geosats from my latitude.
    
    So I dressed appriopriately for a long cold nightly stay outside.
    I mounted my 15 x 80 pair of binoculars on its tripod, placed the
    combination close to my house with a rather good view from souteast
    via south to southwest.
    
    I decided to look at the area where the geosats exit from the shadow.
    
    The results exceeded my expectation:
    I detected 69 satellites. Limiting magnitude +9.5 (estimated)
    Brighter than or equal to magnitude +3: 4
    Between magnitude +3.0 and +3.5       : 5
    Between magnitude +3.5 and +4.0       : 7
    Between magnitude +4.0 and +4.5       : 4
    Between magnitude +4.5 and +5.0       : 4
    Between magnitude +5.0 and +5.5       : 6
    I regard all the satellites brigther than or equal to
    magnitude +5.5 naked eye objects
    (from my location in an outerpart of a modest light polluted village)
    With my aging eyes I saw all satellites brighter than about +5.0
    in reality.
    
    Following list is a log of the "observed" geosats. Specified time
    is that of the intersection by the satellite of a reference line
    between two stars at either side of the satellite. This reported
    time is not the time of maximum brightness. I found it too difficult
    to determine a time-location combination for this. I limited myself
    to a (pseudo) positional observation to support an identification.
    I noticed that several satellites were brighter further from the
    shadow than others.
    
    Several times I witnessed three or even four naked eye geosats simultaneously.
    The constallation of Cetus had "extra" stars, slowly moving north of
    the line between zeta and theta Ceti.
    
    The most brilliant event was the brigthening of four Spanish geosats.
    Three of them on a straight line about north to south and the second west of it.
    They all reached magnitude +2.9 but not at the same time. The two at the bottom
    (South) were bright at first. The other two brightened several minutes later.
    They are so close that I could not see them separately by naked eye.
    
    The following list shows the preliminary results.
    I am aware of the fact that some geosats are so close to each other that they
    could not be seen separately in my optical device. I reported only one of these.
    The actual reflecting satellite might be another.
    
    I suppose the columntitles are clear enough (1st five columns like in
    IOD-format).
    
    nnnnn yyyy-nnnd site yyyy-mm-dd hh:mm:ss   mm.m   name
    33056 2008-030B 4160 2012-10-12 21:30:17   +7.4   Turksat 3A
    35815 2009-047A 4160 2012-10-12 21:33:43   +6.5   USA 207
    26369 2000-028A 4160 2012-10-12 21:40:25   +5.5   Eutelsat W4
    36101 2009-065A 4160 2012-10-12 21:41:11   +6.3   Eutelsat W7
    24652 1996-063A 4160 2012-10-12 21:49:52   +3.7   Arabsat 2B
    27948 2003-043A 4160 2012-10-12 21:53:26   +8.5   Eutelsat 33A
    37392 2011-016A 4160 2012-10-12 21:54:52   +5.8   Intelsat New Dawn
    38741 2012-043B 4160 2012-10-12 22:02:42   +5.4   Hylas 2
    36745 2010-032B 4160 2012-10-12 22:04:58   +5.8   Arabsat 5A
    28542 2005-005A 4160 2012-10-12 22:13:33   +4.0   XTAR-Eur
    26719 2001-011A 4160 2012-10-12 22:14:54   +4.5   Eutelsat EB 1
    33460 2008-065B 4160 2012-10-12 22:14:58   +8.0   Eutelsat W2M
    26638 2000-081A 4160 2012-10-12 22:16:14   +8.0   Astra 2D
    29526 2006-051A 4160 2012-10-12 22:24:39   +7.0   Arabsat 4B
    25153 1998-006B 4160 2012-10-12 22:29:45   +6.5   InMarsat 3-5
    27400 2002-015B 4160 2012-10-12 22:34:49   +8.5   Astra 3A
    36581 2010-021A 4160 2012-10-12 22:35:25   +3.7   Astra 3B
    25673 1999-018A 4160 2012-10-12 22:43:53   +7.2   Eutelsat W3
    37810 2011-049B 4160 2012-10-12 22:50:50   +3.4   Arabsat 5C
    31306 2007-016A 4160 2012-10-12 22:54:04   +7.7   Astra 1L
    29055 2006-012A 4160 2012-10-12 22:54:08   +7.2   Astra 1KR
    33436 2008-057A 4160 2012-10-12 22:54:30   +7.7   Astra 1M
    26243 2000-019A 4160 2012-10-12 22:58:53   +3.3   SESat 1
    37950 2011-074A 4160 2012-10-12 23:03:58   +5.3   Amos 5
    37836 2011-057A 4160 2012-10-12 23:08:21   +6.5   Eutelsat W3C
    25237 1998-013A 4160 2012-10-12 23:13:39   +7.0   Hot Bird 4
    36582 2010-021B 4160 2012-10-12 23:20:43   +9.0   Comsat BW 2
    29270 2006-032A 4160 2012-10-12 23:21:27   +8.5   Hot Bird 8
    27499 2002-038A 4160 2012-10-12 23:21:29   +3.7   Hot Bird 6
    33459 2008-065A 4160 2012-10-12 23:21:41   +4.8   Hot Bird 9
    34810 2009-020A 4160 2012-10-12 23:26:07   +4.6   Sicral 1B
    34710 2009-016A 4160 2012-10-12 23:34:49   +5.5   Eutelsat W2A
    37258 2010-069A 4160 2012-10-12 23:39:02   +4.6   KA Sat
    28946 2006-007B 4160 2012-10-12 23:39:13   +6.7   Hot Bird 7A
    28187 2004-008A 4160 2012-10-12 23:47:58   +9.5   Eutelsat W3A
    30794 2007-007B 4160 2012-10-12 23:52:34   +8.5   Skynet 5A
    38652 2012-036A 4160 2012-10-12 23:56:53   +4.3   SES 5
    32299 2007-057A 4160 2012-10-12 23:57:43   +7.7   Astra 4A
    31577 2007-021A 4160 2012-10-13 00:04:28   +8.3   Eutelsat 3A
    33750 2009-008B 4160 2012-10-13 00:05:12   +5.8   Hot Bird 10
    36831 2010-037B 4160 2012-10-13 00:06:07   +5.8   Rascom QAF 1R
    28912 2005-049B 4160 2012-10-13 00:12:47   +8.5   Meteosat 9
    32487 2008-006A 4160 2012-10-13 00:18:20   +8.5   Thor 5
    36033 2009-058B 4160 2012-10-13 00:18:50   +3.6   Thor 6
    28358 2004-022A 4160 2012-10-13 00:19:19   +9.0   Intelsat 1002
    32794 2008-022A 4160 2012-10-13 00:26:40   +8.7   Amos 3
    27460 2002-035A 4160 2012-10-13 00:31:07   +4.5   Eutelsat WA
    29273 2006-033B 4160 2012-10-13 00:31:52   +5.0   Syracuse 3B
    26470 2000-046B 4160 2012-10-13 00:39:58   +3.3   Nilesat 102
    37816 2011-051A 4160 2012-10-13 00:41:09   +5.5   Eutelsat AB7
    26927 2001-042A 4160 2012-10-13 00:50:04   +3.6   Eutelsat AB 2
    33595 2009-007A 4160 2012-10-13 00:57:16   +3.6   Express-AM 44
    27508 2002-040A 4160 2012-10-13 01:01:33   +7.8   Eutelsat AB 1
    25949 1999-059A 4160 2012-10-13 01:14:55   +9.3   Telstar 12
    33055 2008-030A 4160 2012-10-13 01:20:00   +8.5   Skynet 5C
    26824 2001-024A 4160 2012-10-13 01:21:31   +8.5   Intelsat 901
    25049 1997-071A 4160 2012-10-13 01:29:20   +9.5   Sirius 2
    38087 2012-007A 4160 2012-10-13 01:36:00   +5.5   SES 4
    27438 2002-027A 4160 2012-10-13 01:46:34   +4.1   Intelsat 905
    24742 1997-009A 4160 2012-10-13 01:53:50   +9.0   Intelsat 801
    27683 2003-007A 4160 2012-10-13 01:59:26   +3.1   Intelsat 907
    26071 2000-007A 4160 2012-10-13 02:10:10   +2.9   Hispasat 1C
    28945 2006-007A 4160 2012-10-13 02:10:12   +2.9   Spainsat
    37264 2010-070A 4160 2012-10-13 02:10:14   +2.9   Hispasat 1E
    27528 2002-044A 4160 2012-10-13 02:10:15   +2.9   Hispasat 1D
    37237 2010-065A 4160 2012-10-13 02:25:54   +7.4   Intelsat 17
    33153 2008-034A 4160 2012-10-13 02:26:24   +3.5   Protostar 1
    27403 2002-016A 4160 2012-10-13 02:30:45   +7.4   Intelsat 903
    28526 2005-003A 4160 2012-10-13 02:42:28   +7.7   NSS 10
    
    Bram Dorreman using 15x80 binoculars
    Site 4160: 51.27931 N, 5.47683 E, 35 m (WGS84)
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