Kosmos 551

  1973-012A

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Zenit-4M flight 47 (Kosmos-551) was a 14-day duration mission at 65.0 deg from Baikonur in Mar 1973. Halfway through the mission the apogee was raised to about 400 km and the manuevering engine was jettisoned, instead of remaining attached until the day before recovery.

Kosmos-551
Date	Time	Event	Orbit
1973 Mar 6	0920:00	Launch by 11A57	KB
	0924	Blok-I burn
	0928	Blok-I sep
	1809		89.51 205 x 295 x 65.0
	1900		89.52 206 x 296 x 65.0 (RAE)
1973 Mar 7	2100		89.50 204 x 294 x 65.0
		Lower orbit
1973 Mar 8	1921		89.41 171 x 318 x 65.0
1973 Mar 9	1200		89.40 173 x 317 x 65.0 (RAE)
1973 Mar 14	2116		89.25 169 x 304 x 65.0
		Raise orbit
1973 Mar 15	0742		90.18 169 x 397 x 65.0
1973 Mar 15	0700		90.18 170 x 398 x 65.0 (RAE)
1973 Mar 16		Engine sep
1973 Mar 18	1523		89.06 169 x 384 x 65.0
1973 Mar 20	0448?	Retrofire
	0458?	PO sep
	0502?	Entry
	0519?	Landed after 13.8d