USA-155

 2000-080A

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The "Great Bear" MLV-11 launch carried a classified NRO geostationary satellite. It may have been a QUASAR (SDS) geostationary comsat or a new signals intelligence platform.

NRO
Date	Time	Event	Orbit
2000 Dec 6	0247:01	Launch by Atlas 2AS AC-157	CC LC36A
		T+0:56 SRB 1-2 out
		T+0:58 SRB 3-4 on
		T+1:09 SRB 1-2 sep
		T+1:53 SRB 3-4 out
		T+1:56 SRB 3-4 sep
		T+2:44 BECO
		T+2:47 Booster sep
		T+3:20 14' Fairing sep
		T+4:29 SECO
		T+4:30 127 km 3.53 km/s
		T+5:01 Atlas sep
		T+5:18 Centaur MES-1
		T+5:50 167 km 4.24 km/s
	0256	T+9:45 Centaur MECO-1	94.70 176 x 831 x 28.2
		T+24:31 Centaur MES-2
		T+26:17 Centaur MECO-2 (MRS)	666.68 270 x 37490 x 26.5
	0315	T+28:55 Centaur sep	666.0 267 x 37378 x 26.5 (NRO)
2006 Feb 9			GEO 10W
2008 Aug 22			1436.12 35745 x 35829 x 2.4 GEO 10.1W
2011 Jul 6			1436.12 35745 x 35829 x 4.6 GEO 10.1W