Re: [dsat] 5919 UNIDs??

From: Bjorn Gimle (b_gimle@algonet.se)
Date: Sun Apr 11 2004 - 11:58:25 EDT

  • Next message: Bjorn Gimle: "5919 Obs 83060C"

    On Apr 10 I observed an object, definitely the same as the
    one Apr 08 in a KH 9-18-like orbit.
    This time, the voice recorder lasted throughout the observation and reduction, but I
    must have bumped the stopwatch against the telescope, so
    the Mode switch got depressed! I was partly saved by the
    final fix - it appulsed a bright star, so I stopped
    following it to identify the star, and a few seconds later
    another object appulsed the same star
    (which turned out to be delta UMi). 
    The other satellite was 76077BN,
    predicted to pass the same star at 20:22:12.75 by all five
    recent elsets 97.22-101.34
    
    So, I estimated the KH 9-18 (?) pass time as 20:22:08+-05,
    and all other obs relative to this one according to
    comments on the recording.
    
    14139 83 060C   5919 E 20040408200539440 17 25 1339721+503412 99 S
    14139 83 060C   5919 E 20040408200545720 17 25 1342332+520744 99 S
    14139 83 060C   5919 E 20040410202126000 58 25 1250675+601842 19 S
    14139 83 060C   5919 E 20040410202130000 58 25 1251318+612304 19 S
    14139 83 060C   5919 E 20040410202142000 17 25 1254527+652733 19 S
    14139 83 060C   5919 E 20040410202144000 58 25 1255497+660153 19 S
    14139 83 060C   5919 E 20040410202146000 58 25 1255912+663864 19 S
    14139 83 060C   5919 E 20040410202207000 58 25 1309209+725490 28 S
    14139 83 060C   5919 E 20040410202308000 58 25 1732154+863634 18 S
    
    Using this elset, with MM derived from Mike's (based on my 02-20/03-12 obs?)
    KH 9-18 Vec2TLE
    1 14139U 83060C   04101.83529389  .00000050  00000-0  18182-3 0    21
    2 14139  96.6435 179.6717 0002577 206.4080 153.6901 12.93712728  3776
    I find reasonably likely star IDs for my first two obs on Apr 08, but not
    the third,
    at 6 sec early. The Mar.12 obs should be disregarded since timing was only
    inferred
    from track position (and it was tumbling). The Feb.20 obs gives a -123 sec
    error
    using this MM, and would require too large correction to be KH 9-18 (if the
    April
    obs is)
    
    -- COSPAR 5919, MALMA,    59.2576 N, 18.6172 E, 23 m         --
    -- COSPAR 5918, HAMMARBY, 59.2985 N, 18.1045 E, 44 m         --
    
    ----- Original Message ----- 
    ...
    Then I watched a 1.4 degree FOV around 13h34m +61.0 HP066234 which
    KH 9-18 should nearly occult. At 20:05:39.44 a satellite passed
    a star pair in my FOV, which hopefully was above this star, but
    I can't recognize it. My voice recorder's batteries, replaced
    last week and only used for about 25 minutes since then, were
    depleted before the satellite appeared :-(
    ...
    
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