Derek Breit, Scott Campbell, Kevin Fetter, Tom Laskowski, Tim Luton, Mike McCants, Alberto Rango, Greg Roberts, Peter Wakelin, Brad Young, and I, contributed observations used to determine one or more of the following element sets. X-37B OTV 1-1 433 X 444 km 1 36514U 10015A 10261.07388335 .00000186 00000-0 40514-5 0 00 2 36514 39.9822 169.1991 0008133 221.8550 138.1636 15.43372509 05 Arc 20100911.03-0915.05 WRMS resid 0.062 totl 0.013 xtrk AEHF 1 3946 X 49985 km 1 36868U 10039A 10261.13053588 .00000000 00000-0 00000-0 0 00 2 36868 15.9995 300.2361 6903664 196.6698 279.1263 1.42609216 06 Arc 20100915.18-0918.13 WRMS resid 0.006 totl 0.004 xtrk The following table summarizes the REA (reaction assembly engine) burns to-date, and includes an estimate of the possible remaining total delta-V in Segment 2: http://satobs.org/seesat_ref/misc/AEHF_1_manoeuvres_v2.2.pdf Had the LAE (liquid apogee engine) manoeuvres not been aborted, the total delta-V to raise the initial perigee to 19,000 km, and decrease the initial inclination to 6 deg, would have been about 985 m/s. Based on s/c launch mass of 13,600 lbs (6169 kg) in ULA's launch press kit, and LAE Isp of 329 (reportedly an IHI model BT-4), total propellant consumption would have been 1623 kg. Based on the published mixture ratio of 0.92, fuel portion would have been 845 kg. Assuming REA Isp of 225, that quantity of fuel would result in a delta-V of 325 m/s. Assuming average thrust of 10 lbs and Isp 225, mass flow rate = 0.0202 kg/s, resulting in total burn duration of 41,832 s = 697 min. The table indicates that additional delta-V of at least ~30 m/s may be expected, which would raise the perigee to at least 4300 km, and further decrease the inclination to about 15.2 deg. AEHF 1 r 228 X 50036 km 1 36869U 10039B 10259.62855910 .00007409 00000-0 24119-2 0 00 2 36869 21.5660 304.6262 7903393 192.4543 118.1749 1.55247146 05 Arc 20100906.77-0917.13 WRMS resid 0.015 totl 0.008 xtrk Ted Molczan _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l
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