Key statistics
Satellite IRS 1B at a glance.
Uptime
12471
Days in orbit
Revolutions
≈ 14.0
Per day
Orbit
SSO
Sun Synchronous Orbit
Inclination
99.4
Latest
Satellite identification and parameters
Extended collection of information and parameters for IRS 1B.
Object identification
Identified? True
Debris? False
Object name: IRS 1B
International designator: 1991-061A
Object number (NORAD): 21688
Object ID (CCSDS): 21688
Country: INDIA (IND)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 103.017 minutes
Inclination: 99.409 deg
SMA: 7279.483 km
Apoapsis: 918.572 km
Periapsis: 884.124 km
RAAN: 289.9849 deg
Eccentricy: 0.00236609
Argument of periapsis: 296.5798 deg
Mean anomaly: 117.8756 deg
Mean motion: 13.97822213 rev/day
Mean motion (dot): -0.00000055 rev/day2
B* drag term: -0.000005385802 1/REarth
Two-line elements (TLE)
Creation date: Oct. 20, 2025, 2:10 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 19, 2025, 11:26 p.m. UTC
TLE line 0: 0 IRS 1B
TLE line 1: 1 21688U 91061A 25292.97697301 -.00000055 00000-0 -53858-5 0 9990
TLE line 2: 2 21688 99.4090 289.9849 0023661 296.5798 117.8756 13.97822213634939
Live tracking on map
Real-time ground track for satellite IRS 1B.
In-orbit conjunctions
A list of the most updated potential collisions computed for object IRS 1B.
Associated space launch
Indian remote sensing satellite
IRS 1B was lifted into orbit during the mission ‘Vostok 8A92M | IRS-1B’, on board a Vostok 8A92M space rocket.
The launch took place on Aug. 29, 1991, 6:48 a.m. from 31/6.
For more information about the launch, click the button.
Vostok 8A92M | IRS-1B
Agency: N/A
Status: Launch Successful
Launch date: Aug. 29, 1991, 6:48 a.m. UTC
Rocket: Vostok 8A92M
Launch pad: 31/6
Location: Baikonur Cosmodrome, Republic of Kazakhstan
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