IRS 1B

Satellite information

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Satellite Type and Status

PAYLOADIN ORBIT

Key statistics

Satellite IRS 1B at a glance.

Uptime

12365

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: 103.019 minutes

Inclination: 99.3991 deg

SMA: 7279.57 km

Apoapsis: 918.82 km

Periapsis: 884.05 km

RAAN: 181.0728 deg

Eccentricy: 0.0023882

Argument of periapsis: 223.4798 deg

Mean anomaly: 251.1087 deg

Mean motion: 13.97797304 rev/day

Mean motion (dot): -0.00000165 rev/day2

B* drag term: -0.000083419 1/REarth

Two-line elements (TLE)

Creation date: July 5, 2025, 5:45 p.m.

Reference frame: TEME

Reference center: EARTH

Epoch: July 5, 2025, 2:56 p.m. UTC

TLE line 0: 0 IRS 1B

TLE line 1: 1 21688U 91061A 25186.62231865 -.00000165 00000-0 -83419-4 0 9990

TLE line 2: 2 21688 99.3991 181.0728 0023882 223.4798 251.1087 13.97797304620071

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.

Target Orbit TCA Probability of collision Miss distance Type
METEOR 2-12 DEB LEO 2025-03-29 09:51:28 0.0002577717 311.0 (m) DEBRIS
SL-16 DEB LEO 2025-01-30 18:40:58 0.000164475 87.0 (m) DEBRIS
FENGYUN 1C DEB SSO 2025-01-27 12:39:31 0.003594311 95.0 (m) DEBRIS
COSMOS 1375 DEB LEO 2024-09-29 21:30:55 0.0001577137 531.0 (m) DEBRIS
DELTA 1 DEB SSO 2024-09-24 20:42:32 0.0003228416 272.0 (m) DEBRIS

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.

Launch to space Vostok 8A92M | IRS-1B
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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