Re: accuracy of ISS / Venus transit track

From: Thomas Fly (
Date: Fri Jun 04 2004 - 12:33:07 EDT

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    Robert Matson wrote:
    > Just wanted to chime in that Tom is absolutely right
    Hi Robert- I entered the following transit location into CalSKY:
    A - seconds elapsed since "Contact 1," at 5:13:29 UTC
    B - UTC time (June 8)
    C - elevation angle of the ISS/Venus
    D - azimuth angle of the ISS ( + is East from North; - is W from N)
    E - range (miles)
    F - latitude for observing the transit
    G - longitude
    H - sun elevation angle
    I - sun/Venus separation angle
    A----  B-------  C--- D----- E--- F------- G-------- H---- I----
     7762   7:22:51   0.9  -64.5 1319  27.5991  171.1298   0.5   0.2
    which appears to give an "unrefracted" answer back, showing the ISS passing
    about 2' of arc above Venus:
    Tuesday 8 June 2004
     Observer SiteUser Site
    WGS84: Lon: +171d07m47.3s  Lat: +27d35m56.8s  Alt: -6m
     7h22m50.97sISSMay cross the disk of Venus. Separation: 0.03d  Position Angle:
    Angular Velocity: 6.5'/s Angular diameter: 8.7"  size: 73.0m x 44.5m x 27.5m
    Satellite at az: 295.5d WNW  h:  1.0d  dist: 2122.7 km  mag=13.1m  -5.7
    I hope someday to capture a transit of the ISS across a rising/setting Sun or
    Moon- though at that distance & seeing, the ISS is likely only to be a small,
    indistinct blob- otherwise, the effect of atmospheric ray-bending is just a
    small technical point ;-)
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