PPAS optical characteristics

From: Greg Roberts (grr@iafrica.com)
Date: Sun Dec 03 2000 - 03:32:47 PST

  • Next message: Greg Roberts: "Recent IOD positions"

    Hi
    
    Following might be of interest to some observers:
    
    These observations were made using my CoSaTrak system whilst waiting
    for USA 129. No attempt was made to follow the satellites so observations
    based on what was seen in the time it took to traverse the 4.8 degree
    field of view of the CCD camera as seen on a video monitor.
    
    
    G.Roberts, GR, Lat = -33.9405, Long = +18.5129, Alt = 10 m   Cospar 0433
    
    81- 41B  00-11-29 20:01      GR                      +5.7 steady
    96- 72A  00-11-29 20:12      GR                      +4.4 steady
    66- 31B  00-11-30 18:34      GR                      +5.9 steady
    81- 43B  00-11-30 18:35      GR                      +6.0 steady
    98- 42C  00-11-30 18:43      GR                      +6.3 steady
    84- 10B  00-11-30 19:06      GR                      +6.7 varying ?
    74- 71A  00-11-30 19:12      GR                      +6.4 steady
    77- 44A  00-11-30 19:40      GR                      +6.5 irreg flashes to
    +6.0
    80- 03B  00-11-30 19:18      GR                      +5.9 steady ?
    72- 65B  00-11-30 19:30      GR                      +3.6 steady
    65- 82AF 00-11-30 19:34      GR                      +5.6 steady
    74- 48B  00-11-30 20:02      GR                      +5.9 steady
    92- 23A  00-11-30 20:17      GR                      +5.6 irreg flickering
    83-109A  00-11-30 20:17      GR                      +6.2 steady
    79- 89B  00-12-01 18:35      GR                      +6.0 steady
    98- 23D  00-12-01 18:38      GR                      +7.4 flickering?
    91- 63B  00-12-01 19:01      GR                      +4.2 steady
    72- 62B  00-12-01 19:24      GR                      +6.7 steady
    85- 13B  00-12-01 20:38      GR                      +6.0 steady
    96- 72A  00-12-01 19:25      GR                      +6.0 steady
    96- 72A  00-12-01 21:03      GR                      +2.5 brilliant,steady
    97- 68B  00-12-01 18:37      GR                      +5.5 to +6.9,p=1.176
    sec
    
    The procedure I use is to set the low light level camera at a known
    azimuth/elevation position ( sometimes chosen at random) then sit and watch
    the video monitor and make a note of satellites crossing the field of view
    as well as direction of travel, etc. The next day I run through the video
    tape , on which the data was recorded, and, in conjunction with GUIDE V7 or
    SKYMAP64, I identify the satellites seen on the tape. Magnitudes are
    estimated by comparing to stars in the field of view that have approximately
    the same brightness - the disadvantage here is that the ccd chip in the
    camera has a better response in the infra-red so magnitudes may vary a lot
    due to the spectral class of the star chosen - I avoid red stars .  Since
    time is also recorded on the video tape I can do positional work on any of
    the objects seen, if required.
    
    Cheers
    Greg
    
    
    ----------------------------------------------------------------------------
    --------------
    Lazy bum (retired astronomer), visual/radio  satellite tracker,computer
    junkie,  radio amateur (ZS1BI - not active - told you I was a lazy bum!)
    COSPAR #0433: Long 18.51294 deg E, Lat 33.94058  deg S
    Alt 10 metres. Pinelands (near Cape Town),South Africa
    
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