Obs 30 Aug 2005 Part 1

From: Greg Roberts (grr@iafrica.com)
Date: Wed Aug 31 2005 - 10:16:57 EDT

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    Observations 30 Aug 2005  Part 1
    ---------------------------------------
    Cosatrak 1 (Computerised satellite Tracking System).
    MINTRON low light level CCD surveillance camera (0.005 lux typical
    in non integration mode) and 0.00005 lux in STARLIGHT mode with 128
    frame integration. Due to bright sky it is not worthwhile integrating
    more than 48 frames which is equivalent to an exposure of 0.96 seconds.
    
    Used with 145mm focal length f/2.5 lens giving a field of view of
    about 2.55 x 1.86 degrees.
    
    Site 0433 : Longitude 18.51294 deg East, Latitude  33.94058 deg S,
    Elevation 10 metres - situated in Pinelands (Cape Town), South Africa
    
    
    Part 1:
    -------
    
    26473 00 047A   0433 G 20050830165642500 17 15 1955430+144245 39  +020 05
    26473 00 047A   0433 G 20050830165717700 17 15 1957550+205448 39  +025 05
    24753 97 012A   0433 G 20050830171303100 17 15 0040575-560258 39  +055 05
    24753 97 012A   0433 G 20050830171419200 17 15 2322197-532309 39  +050 05
    24753 97 012A   0433 G 20050830171548800 17 15 2140111-411414 39  +045 05
    24753 97 012A   0433 G 20050830171634900 17 15 2053555-295303 39  +040 05
    07816 75 043A   0433 G 20050830171817300 17 15 1633346+163957 39  +060 05
    07816 75 043A   0433 G 20050830171918700 17 15 1602266-034152 39  +055 05
    07816 75 043A   0433 G 20050830172021400 17 15 1511574-311935 39  +050 05
    18009 87 043E   0433 G 20050830172243500 17 15 2112217+100343 39  +100 05
    18009 87 043E   0433 G 20050830172314200 17 15 2121564+065202 39  +100 05
    18009 87 043E   0433 G 20050830172357800 17 15 2135577+022137 39  +080 05
    18010 87 043F   0433 G 20050830172731500 17 15 2056124+141242 39  +100 05
    18010 87 043F   0433 G 20050830172832900 17 15 2115292+074046 39  +095 05
    18010 87 043F   0433 G 20050830172928000 17 15 2133538+014238 39  +090 05
    11745 80 019G   0433 G 20050830173157700 17 15 1445547+180746 39  +100 05
    11745 80 019G   0433 G 20050830173318400 17 15 1458048+094155 39  +095 05
    11745 80 019G   0433 G 20050830173400600 17 15 1505247+040004 39  +095 05
    21798 91 082A   0433 G 20050830173535400 17 15 0117332-745700 39  +065 05
    21798 91 082A   0433 G 20050830173635500 17 15 2159516-763926 39  +060 05
    21798 91 082A   0433 G 20050830173735700 17 15 1902382-643235 39  +055 05
    10502 77 112A   0433 G 20050830173947500 17 15 1936444+192732 39  +095 05
    10502 77 112A   0433 G 20050830174100500 17 15 1959033+112529 39  +090 05
    28385 04 034B   0433 G 20050830181908400 17 15 1451210-654716 39  +080 05
    28385 04 034B   0433 G 20050830182212700 17 15 1517317-684232 39  +080 05
    28385 04 034B   0433 G 20050830182333300 17 15 1531556-695932 39  +085 05
    20344 89 061D   0433 G 20050830183139100 17 15 2003469+315028 39  +100 05
    20344 89 061D   0433 G 20050830183252000 17 15 2005450+302808 39  +100 05
    20344 89 061D   0433 G 20050830183358600 17 15 2008480+291800 39  +100 05
    27712 03 012B   0433 G 20050830183605100 17 15 2131072+051052 39  +105 05
    27712 03 012B   0433 G 20050830184544800 17 15 2140447+051615 39  +105 05
    90035 05 625A   0433 G 20050830183605100 17 15 2132577+051429 39  +110 05
    90035 05 625A   0433 G 20050830184544800 17 15 2142381+051437 39  +110 05
    27380 02 007A   0433 G 20050830183605100 17 15 2153311+050853 39  +120 05
    27380 02 007A   0433 G 20050830184544800 17 15 2143053+051835 39  +120 05
    90016 03 766A   0433 G 20050830183925400 17 15 1954515-015732 39  +095 05
    
    Unknown:
    -----------
    91040 05 241LEO 0433 G 20050830170757500 17 15 1117065-433120 39  +100 05
    91040 05 241LEO 0433 G 20050830170950300 17 15 1216499-165554 39  +090 05
    91040 05 241LEO 0433 G 20050830171028300 17 15 1228297-082138 39  +090 05
    91040 05 241LEO 0433 G 20050830171044400 17 15 1232382-045810 39  +095 05
    91040 05 241LEO 0433 G 20050830171102100 17 15 1236525-012700 39  +100 05
    
    Notes:
    ------
    (1) Cleared rather suddenly after rain most of the day.
    
    (2) Managed to acquire unknown 91040 again.
    
        I noticed that the rough orbit estimate was similar to the orbit  for the 
    unknown
        observed on June 21 2005. Ted suspected that the  object was in fact the 
    rocket
        of XSS11 and provided an estimated orbit based on the June 21 observations.
    
        Using this orbit I then juggled (jiggled?) the various parameters  - 
    introducing a
        negative drag term, one minute change in epoch and  a half degree change in 
    the
        RA of Ascending Node until I had two  orbits that fitted the observation  of 
    29
        August 2005 reasonably well ( about 30-40 second error in time).
    
        The first orbit was tried and nothing was immediately obvious so  after 
    tracking
         for about a minute I changed to the second orbit  and acquired the 
    satellite and
         followed it until it disappeared  behind a neighbours house.
    
        Later integration of several frames revealed the object at the top  of the 
    field for
        the first track - this is the first position given  today. The remaining 
    positions
        were obtained using the second orbit.
    
        The satellite appeared to have a small variation in magnitude. With dark sky
        conditions it should be a reasonably easy object- I had to contend with 
    evening
        twilight and poor phase angle as  well as low elevation.
    
        The observations of 21 June,29 August and 30 August all appear to  be of the
        same object which is suspected to be XSS11 rocket,  catalog number #28637,
        05011B.  Unfortunately , unless I get up  before the birds, I will not be 
    seeing
        this object again in the evening sky for quite a few months as this part of 
    the orbit
        is  now in bright twilight and getting brighter daily as summer  returns to 
    the
        southern hemisphere.
    
    (3) Still a few satellites to report -
        NOSS 1(D), Milstar 3 Cn R, Noss 2(D),DMSP B5D2-8, and Noss 4 (H)
    
    (4) Had to stop when the clouds returned.
    
    (5) Next tracking session will be aimed at acquiring the object mentioned  by 
    Tony
         Beresford in a recent message to SeeSat ( apogee around  85000 kilometres).
    
    Cheers
    Greg
    
    
    
    
    
    
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