Prognoz 6

Designation	10370 / 77093A
Launch date	22 Sep 1977
Launch site	Baikonur,
Launch vehicle	Molniya-M/Blok SO-L (8K78M)
Mission	Scientific: magnetosphere study
Earth orbit on:
Perigee/Apogee	488 x 197867 km
Inclination	65°
Period	5688 min
HEO Earth orbit on 6 Mar 2008:
Perigee / Apogee	26274 x 171974 km
Eccentricity
Inclination	51.7 deg
Period	min

Re-entered date:	16 Jan 2019 (.49)
Lifetime:

The SO-M No. 506 solar particles observatory was launched in September 1977 and given the code name Prognoz 6. It and the Blok SO-L fourth stage of the 8K78M Molniya launch vehicle entered a 488 x 200000 km x 65.0 deg elliptical orbit.
On 2008 Mar 6 Prognoz-6 was in a 26274 x 171974 km x 51.7 orbit; the Blok SO-L was never tracked, but has now finally been cataloged in a 33653 x 161978 x 48.1 deg orbit.

Ref: #3(SD555), #7(JR593), #15 - update: 25.08.19