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IRIDIUM 121, 42812

Orbit data source: Space-Track

IRIDIUM 121, 42812 is a payload satellite owned by Iridium (US) in LEO that was launched on Sun, 25 Jun 2017 UTC via an FALCON 9 launch vehicle from the Air Force Western Test Range (AFWTR). Payload-class satellites include a variety of spacecraft equipped with specific instruments for various scientific and technological missions. These include communications satellites like Starlink; space stations such as the ISS; scientific satellites like the Hubble; Earth observation satellites from companies like Planet Labs, Umbra, and HawkEye 360; GPS; miniature CubeSats for education and research; and military/defense satellites.

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<iframe src="https://www.satcat.com/sats-embedded/42812?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

Iframe URL

https://www.satcat.com/sats-embedded/42812?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

42812, 2017-039K

Orbit

LEO

Country

Related business

Iridium Communications Inc. (US)

Manufacturer

OATK SSG Gilbert

Mission

Operational Commercial Communications

Bus & Motor

ELITEBUS, Unknown motor

Mass

860 kg wet, 700 kg dry

Launch date (UTC)

2017-06-25 (9 years ago)

Launch vehicle

FALCON 9

Launch site

Air Force Western Test Range (AFWTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Trap Box + 2 Pan, 4.8 m

Radar Cross Section

10.154 m², Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 1 day ago

TLE from 1 day ago

0 IRIDIUM 121
1 42812U 17039K   26135.16716785  .00000119  00000-0  35500-4 0  9993
2 42812  86.3994   7.4746 0002119  85.0827 275.0611 14.34215492465090

Epoch: 2026-05-15T04:00Z

TLE epoch observation values (Epoch: 2026-05-15T04:00:43.302Z)

Latitude

0.00002°

Longitude

74.3918°

Altitude

780.592 km

Speed

7.464 km/s

True Right ascension

00h 29m 53s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

Unknown

Longitude

Unknown

Altitude

Unknown

Speed

Unknown

Apparent Right ascension

Unknown

Apparent Declination

Unknown

Sunlit

N/A

Visualization observer readout

Local Sidereal Time

14:22:29

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

776.155 km

Perigee altitude

773.123 km

Semi-major axis

7,152.776 km

Eccentricity

0.00021

Inclination

86.3994°

RAAN

7.4746°

Arg. of periapsis

85.0827°

True anomaly

275.03691°

Mean anomaly

275.0611°

Eccentric anomaly

275.04901°

Mean motion

3.58782 °/min

Orbital period

100.34 mins

BSTAR

0.0000355

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Other satellites on launch #39 in the year 2017 (2017-06-25 UTC)

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IRIDIUM 121 Visibility forecast

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Span	Click to sort rows by Start time (UTC) header in descending order	Start Az.	Max El. time (UTC)	Max El. Az.	Max El.	End time (UTC)	End Az.
9 mins	2026-05-16 15:17:07.435Z	149.715° SSE	2026-05-16 15:22:07.435Z	74.543° E	30.17°	2026-05-16 15:26:07.435Z	21.489° NNE
6 mins	2026-05-16 17:00:07.435Z	244.414° WSW	2026-05-16 17:02:07.435Z	274.86° WNW	22.125°	2026-05-16 17:06:07.435Z	331.224° NNW
8 mins	2026-05-17 03:29:07.435Z	359.571° N	2026-05-17 03:33:07.435Z	152.62° SSE	44.434°	2026-05-17 03:37:07.435Z	176.618° S

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Co-orbital & Co-planar RSOs

Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions

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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings

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Check out IRIDIUM 121, 42812 on other resources

View IRIDIUM 121, 42812 on NASA - NSSDCA Website

View IRIDIUM 121, 42812 on Heavens-Above

View IRIDIUM 121, 42812 on Keep Track

View IRIDIUM 121, 42812 on Celestrak

View IRIDIUM 121, 42812 on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.

IRIDIUM 121, 42812

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 1 day ago

TLE from 1 day ago

TLE epoch observation values (Epoch: 2026-05-15T04:00:43.302Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #39 in the year 2017 (2017-06-25 UTC)

IRIDIUM 121 Visibility forecast

Co-orbital & Co-planar RSOs

Check out IRIDIUM 121, 42812 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 1 day ago