Re: ISS & Zvezda

From: CmdrJaycee@aol.com
Date: Sun Jul 23 2000 - 11:50:53 PDT

  • Next message: David Brierley: "DMB Obs Jul 21-22"

    In a message dated 7/23/0 Sun, 23 Jul 2000 10:16:39, "Jeff Hunt" 
    <jeff_satobserve@worldnet.att.net> writes:
    
    >I thought I had missed Z somehow (predicted 08:22 UTC approx.) until it
    >showed up out of the shadow at 08:25:50 UTC well close to 4 minutes later
    >in a higher orbit based on the July 22 epoch from Heaven-Above. Z was
    >slightly brighter than ISS (IMO) and steady.
    >
    >The last posted maneuver for Z was late Friday July 21. Did anyone else
    >note a late arrival?
    
    I got out to see the same pass about 25 mile NW of Washington, perhaps sky 
    conditions just a bit worse than Jeff's (limiting magnitude about 2, through 
    the mottled haze and clouds).  I timed the lunar passes of both the ISS and 
    Zvesda to have been just about eight minutes, thirty seconds apart.  I was 
    prepared for Zvesda to be a bit later than predicted, but that additional 
    three and a half minutes still came as a surprise, even knowing of the two 
    maneuvers.  But I'm glad it WAS late (and that I hung around as long as I 
    did); a very dense cloud bank moved in over the area of sky they were passing 
    through and it took almost the full 8.5 minutes to clear the Moon again.  Had 
    Zvesda been any earlier, I would not have seen it.  
    
    By the way, I found Heavens-Above had updated its TLE for Zvesda about a half 
    hour after the pass, and reloading their morning bright satellites page then 
    produced predictions pretty much right on the nose -- about 8.5 minutes apart 
    between them.
    
    Knowing there's one more maneuver before tomorrow morning's passes (which may 
    well be clouded out from what I'm hearing), I suppose we can expect Zvesda to 
    appear somewhat later than the four minute gap now predicted using the 
    current H-A elements.
    
    A related question for the group:  on the NASA HSF orbital elements page for 
    Zvesda, 
    
    http://spaceflight.nasa.gov/realdata/elements/
    
    they have a TLE for epoch date 210.   That should be AFTER docking.   Does 
    anyone know if that is a predicted station-keeping orbit in case docking 
    fails? 
    
    Jim Cook
    Germantown, MD
    39.2N, 77.3W
    
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