Launch Details

Launched	15 September 1987
Flight ended	–
Status	Non-operational
Launch site	Tyuratam Missile and Space Center, Kazakhstan (Also known as Baikonur Cosmodrome)
Owner	Commonwealth of Independent States (former USSR)
NORAD ID	18356
COSPAR ID	1987-079B
Alternative names	GLONASS GLONASS 21
Observing

Current orbital elements

Inclination	65.694°
Eccentricity	0.00201
RA ascending node	21.575 hr
Argument perigee	209.021°
Mean anomaly	329.315°
Orbital period	675.730 min
Epoch of osculation	02 Feb 2026, 09:25

See historical orbital elements »

Derived Quantities

Min Altitude	19085.8 km
Mean Altitude	19137.0 km
Peak Altitude	19188.1 km

Launched alongside

COSMOS 1883 COSMOS 1885 SL-12 PLAT SL-12 R/B(1) SL-12 R/B(2) SL-12 R/B SL-12 R/B SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB SL-12 DEB