IGS 8 search elements

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Fri Jan 25 2013 - 19:12:32 UTC

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    The eighth launch of Japan's IGS (Information Gathering Satellite) program is scheduled for launch from Tanegashima on
    an H-IIA rocket, on 2013 Jan 27 between 04:05 and 06:33 UTC.
    
    The consensus on the web appears to be that IGS 8's payload consists of two satellites: IGS Radar 4 and a demonstrator
    of the next generation optical payload. This launch targets the plane of IGS Optical 4 (11050A / 37813). Launching near
    04:37 UTC would precisely match the RAAN of 11050A, based on its last known elements.
    
    Japanese contributors to NSF cited a Mr. K. Shibata as having reported, "H-IIA F22 is 202 configuration with 4/4D-LC
    fairing. 1st deploy the IGS radar-4 and 2nd deploy the IGS Optical-5 demo satellite", and that the actual launch window
    is from 04:40 to 04:53 UTC.
    
    http://forum.nasaspaceflight.com/index.php?topic=30241.15
    
    Based on our tracking of IGS Radar 4, and launch at 04:40 UTC, I offer the following approximate search elements:
    
    IGS Radar 4                                              508 X 513 km
    1 79215U          13027.23872042  .00000000  00000-0  00000-0 0    08
    2 79215  97.5207 150.3279 0003529  53.6978 306.4581 15.17600117    06
    
    IGS Radar 4 rocket                                       471 X 509 km
    1 79216U          13027.23888793  .00006889  00000-0  28000-3 0    03
    2 79216  97.4180 150.3945 0027593  48.5636 311.7965 15.24232445    05
    
    I do not know the intended altitude of the new optical satellite. The earliest optical satellites orbited at about the
    same ~500 km altitude of the radar satellites, but Optical 3 and 4 adopted a ~74 km higher orbit.
    
    The orbit is visible from the mid-southern hemisphere, but passes occur well after local midnight, and enter eclipse
    soon after rising, at low elevation. Northern hemisphere visibility occurs around the summer solstice.
    
    Ted Molczan
    
    
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