Geosats obs from 51 deg N

From: Bram Dorreman (bram.dorreman@skynet.be)
Date: Fri Oct 15 2004 - 18:41:46 EDT

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    This year I was lucky in the optimal night, almost clear from evening till
    morning.
    The night before I could observe during some hours. I used a 15 x 80
    binoculars on atripod.
    In the "long" night it happened twice that I saw three geosats
    simultaneously by
    unaided eye: the constellation of Cetus was often provided with one or more
    extra stars.
    
    Here are my brightness estimates. I've ordered the observations by
    longitude.
    
    Night of 2004 October 11/12
    
    int.id. catnr  name           maxmag long.
    
    98-006 B 25153 Inmarsat 3 5    8.2 25.1 E
    94-070 A 23331 Astra 1D        4.0 23.6 E
    93-031 A 22653 Astra 1C        6.2 19.2 E
    01-025 A 26853 Astra 2C        9.0 19.2 E
    91-015 A 21139 Astra 1B        9.0 19.1 E
    97-076 A 25071 Astra 1G        8.2 19.1 E
    98-056 A 25491 Eutelsat W2     4.1 16.1 E
    01-005 A 26694 Sicral          5.3 16.0 E
    96-067 A 24665 Hot Bird 2      8.5 13.2 E
    98-013 A 25237 Hot Bird 4      3.7 13.1 E
    04-008 A 28187 Eutelsat W3A    5.8  7.1 E
    98-056 B 25492 Sirius 3        4.4  5.0 E
    97-071 A 25049 Sirius 2        5.3  4.9 E
    02-035 A 27460 Stellat 5       5.9  4.9 E
    03-059 A 28132 Amos 2          5.6  4.0 W
    
    Night of 2004 October 12/13
    int.id.  catnr name          maxmag long.
    03-060 A 28134 Express-AM 22   4.8 53.0 E
    03-053 A 28089 Yamal 201       5.0 49.1 E
    03-018 A 27807 Gsat 2          7.8 48.0 E
    99-018 A 25673 Eutelsat W3     7.4 47.6 E
    00-068 A 26590 EuropeStar 1    7.7 45.0 E
    96-040 B 23949 Turksat 1C      8.5 42.2 E
    01-002 A 26666 Turksat 2A      8.5 42.0 E
    02-029 A 27441 Ekspress-A 4    7.9 40.1 E
    00-028 A 26369 Eutelsat W4     4.7 36.2 E
    00-019 A 26243 Sesat           4.7 35.9 E
    91-055 A 21653 Intelsat 6 5    8.5 33.1 E
    94-049 B 23200 Turksat 1B      8.2 31.4 E
    96-063 A 24652 Arabsat IIB     7.7 30.5 E
    01-011 A 26719 Eurobird        5.4 28.6 E
    98-050 A 25462 Astra 2A        4.7 28.3 E
    00-081 A 26638 Astra 2D        7.7 28.3 E
    00-054 A 26494 Astra 2B          ? 28.2 E
    98-006 B 25153 Inmarsat 3 5    5.0 25.1 E
    94-070 A 23331 Astra 1D        5.9 23.6 E
    93-031 A 22653 Astra 1C        8.4 19.2 E
    01-025 A 26853 Astra 2C        8.4 19.2 E
    91-015 A 21139 Astra 1B        8.4 19.1 E
    98-056 A 25491 Eutelsat W2     4.2 16.1 E
    01-005 A 26694 Sicral          6.0 16.0 E
    95-016 B 23537 Hot Bird 1      3.2 13.2 E
    96-067 A 24665 Hot Bird 2      6.4 13.2 E
    97-049 A 24931 Hot Bird 3      5.4 13.2 E
    04-008 A 28187 Eutelsat W3A    9.0  7.1 E
    98-056 B 25492 Sirius 3        8.2  5.0 E
    97-071 A 25049 Sirius 2        5.0  4.9 E
    95-060 A 23712 Milstar 2       4.8  1.1 E
    97-025 A 24808 Thor 2          8.5  0.7 W
    98-035 A 25358 Thor 3          8.5  0.8 W
    04-022 A 28358 Intelsat 10 2   8.5  1.0 W
    96-030 B 23865 Amos 1          5.4  4.0 W
    03-059 A 28132 Amos 2          3.9  4.0 W
    02-035 A 27460 Stellat 5       4.1  4.9 W
    95-067 A 23730 Telecom 2C      6.3  5.2 W
    00-031 A 26378 Ekspress-A 3    5.9 10.9 W
    02-040 A 27508 Atlantic Bird 1 4.7 12.6 W
    96-053 A 24307 Inmarsat 3 2    7.7 15.5 W
    01-024 A 26824 Intelsat 9 1    7.7 18.0 W
    02-019 A 27414 NSS 7           3.3 22.0 W
    02-027 A 27438 Intelsat 9 5    3.6 24.5 W
    03-007 A 27683 Intelsat 9 7    3.3 27.5 W
    02-044 A 27528 Hispasat 1D     3.6 30.0 W
    00-007 A 26071 Hispasat 1C     3.3 30.1 W
    97-009 A 24742 Intelsat 8 1      ? 31.5 W
    98-002 A 25134 Skynet 4D       5.8 34.2 W
    02-016 A 27403 Intelsat 9 3    3.6 34.5 W
    
    The identification of the Astra's on 19.2°E
    may be incorrect. This is also true for the
    Amos'es.
    
    I got the impression that most objects are brighter
    when emersed and sometiems the max. brightness is
    more than 2.5 ° from the shadow.
    (I used program Highecl to identify the objects).
    
    Bram Dorreman
    COSPAR 4160
    51° 16' 45.5" N  5° 28' 36.6" E (WGS84) 35 m
    
    
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