OGO 1

From: Curtis Haase (73007.2024@compuserve.com)
Date: Wed Jan 16 2008 - 04:34:10 UTC

  • Next message: Art Glick: "Re: OGO 1"

    Has anyone observed OGO 1 (00879, 64-054A)?
    
    This old spacecraft is in a highly eccentric orbit (e~0.8)
    with a long period (over 2.6 days).  I noticed that it makes
    a perigee pass over the middle of the US in a dark sky on the
    morning of Jan 19 (perigee around 11:24 UTC, height 9800 km).
    
    This is one of those "ultra-deep space" objects that shows a
    large difference in ephemeris output depending on whether the
    TLE propagator does (or does not) apply deep-space perturbation
    offsets at epoch.  In the case of the Saturday AM perigee pass,
    I found that the two methods give a similar path among the
    stars, but with a large time difference (over 11 minutes!).
    
    Has anyone actually observed OGO 1 to see which approach is
    correct?
    
    Thanks,
    
    Curtis Haase
    Dallas TX
    73007.2024@compuserve.com
    
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