NROL-37: pre-launch elements

From: Ted Molczan via Seesat-l <seesat-l_at_satobs.org>
Date: Fri, 10 Jun 2016 05:43:43 -0400
NROL-37 is scheduled for launch from CCAFS on a Delta-IV-Heavy, on 2016 June 11. The launch period is from 17:30 to
22:30 UTC. Lift-off is scheduled for 17:51 UTC.

http://spaceflightnow.com/2016/06/08/d374_journal/

The launch azimuth indicates a GEO mission, which for an NRO heavy-lift launch, means the second stage will perform
three burns to place the payload directly into an inclined GEO orbit.

The payload probably is Mentor 7 (aka Advanced Orion 7).

Below are estimated orbital elements, based on an on-time launch. Epoch corresponds to the approximate end of a burn.

SECO 1                                                   190 X 244 km
1 77799U 77799A   16163.75263657  .00656932  00000-0  21234-3 0    05
2 77799  28.7000 350.7026 0040859  90.0000  38.0000 16.22456322    00

SECO 2                                                 212 X 35809 km
1 77799U 77799A   16163.76142364  .00000000  00000-0  00000-0 0    01
2 77799  26.5000 350.6340 7298000 180.0000   0.0000  2.28000000    02

SECO 3                                               35746 X 35830 km
1 77799U 77799A   16163.98011568  .00000000  00000-0  00000-0 0    06
2 77799   5.0000 350.5522 0010000 180.1373 179.8600  1.00270000    03

Allow for cross-track errors of at least several degrees, and time errors of several minutes.

The longitude at insertion into GEO will be close to 96 E. Contrary to the SECO 3 TLE, the mean motion is likely to be
somewhat more or less than synchronous, depending whether the planned destination is east or west of 96 E. Inclination
in GEO could be between about 3 and 7 deg.

Estimated standard visual magnitude in LEO and GTO is 4 +/-2 (1000 km range, 90 deg phase angle). Once fully deployed in
GEO, the payload will typically be near magnitude 8. The Delta IV 5m 2nd stage typically reaches mag 9 to 12 at GEO
range.

Ted Molczan


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Received on Fri Jun 10 2016 - 04:44:35 UTC

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