Re: NROL-25 to launch FIA Radar 2

From: Bob Christy (bob@zarya.info)
Date: Mon Mar 26 2012 - 20:09:22 UTC

  • Next message: Bob Christy: "Re: NROL-25 to launch FIA Radar 2"

    A NOTAM has been published for the impact zones of launcher components. 
    Being a different vehicle from the first FIA Radar satellite, they lie 
    at different distances from Vandenberg. The new ones (Delta 4) line up 
    very well along the same track and between the ones from the earlier 
    Atlas launch.
    
    The restriction period is 22:15-23:34 UTC. It fits the 22:30 launch time 
    with some spare time for unexpected delays. It hints, possibly, at a 
    launch window of about 30 minutes duration.
    
    Bob Christy
    
    
    On 25/03/2012 07:26, Ted Molczan wrote:
    > NROL-25 is scheduled for launch on a Delta IV Medium+ (5,2), from Vandenberg AFB, on 2012 Mar 29 at 22:30 UTC. I am
    > confident that its payload is the second FIA Radar satellite.
    >
    > FIA Radar 1 (10046A / 37162) was launched on NROL-41, from VAFB, aboard an Atlas V-501. If NROL-25's ascent trajectory
    > is identical to that of NROL-41, then the payload's orbit at the first ascending node after separation from the second
    > stage will be:
    >
    >                                                         1067 X 1080 km
    > 1 79701U          12090.05719863  .00000000  00000-0  00000-0 0    08
    > 2 79701 122.9931 201.7813 0008524  77.8521 282.3398 13.49540846    03
    >
    > Since the launch vehicle is different, it is reasonable to expect small differences from the above elements.
    >
    > Northern hemisphere observers will have evening visibility. Southern hemisphere observers will have morning visibility.
    >
    > Since the performance of the Delta IV Medium+ (5,2) exceeds that of the Atlas V-501, it is reasonable to expect that
    > NROL-25's second stage will de-orbit soon after payload separation, the same as NROL-41's Centaur.
    >
    > FIA Radar 1 manoeuvred over a 21 day period to adjust its orbit to an altitude of 1103 km, with the argument of perigee
    > frozen near 90 deg.
    >
    > FIA Radar 2's RAAN will be nearly 180 deg east of that of FIA Radar 1, and their planes will be 114 deg apart.
    >
    > I expect NROL-39 and NROL-45 to complete the initial FIA Radar constellation. Both are Atlas V-501 launches from VAFB.
    >
    > Ted Molczan
    >
    >
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