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OV1-4, 2121

Orbit data source: Space-Track

OV1-4, 2121 is a payload satellite owned by USAF OAR (US) in LEO that was launched on Wed, 30 Mar 1966 UTC via an ATLAS D 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 embed code

<iframe src="https://www.satcat.com/sats-embedded/2121?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/2121?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

2121, 1966-025A

Orbit

LEO

Country

Related business

US Air Force Office of Aerospace Research (US)

Manufacturer

GD/Convair

Mission

Defense Science

Bus & Motor

OV1, Unknown motor

Mass

87 kg wet, 87 kg dry

Launch date (UTC)

1966-03-30 (59 years ago)

Launch vehicle

ATLAS D

Launch site

Air Force Western Test Range (AFWTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Domed Cyl, 0.7 m

Radar Cross Section

0.946 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history
Last TLE update: 12 hours ago

TLE from 12 hours ago

0 OV1-4
1 02121U 66025A   25242.78848751  .00000354  00000-0  69066-4 0  9991
2 02121 144.5042 343.9453 0082613  92.5456 268.4684 13.87271233 10792

Epoch: 2025-08-30T18:55Z

TLE epoch observation values (Epoch: 2025-08-30T18:55:25.32Z)

Latitude

-0.00001°

Longitude

80.87205°

Altitude

939.345 km

Speed

7.383 km/s

True Right ascension

22h 55m 46s

True Declination

0° 00' 00"

Sunlit

Object was in full shadow 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

22:22:49

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,001.658 km

Perigee altitude

880.723 km

Semi-major axis

7,319.327 km

Eccentricity

0.00826

Inclination

144.5042°

RAAN

343.9453°

Arg. of periapsis

92.5456°

True anomaly

267.52237°

Mean anomaly

268.4684°

Eccentric anomaly

267.99535°

Mean motion

3.46606 °/min

Orbital period

103.86 mins

BSTAR

0.000069066

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Other satellites on launch #25 in the year 1966 (1966-03-30 UTC)

OV1-5, 2122

OV1-5 R/B, 2123

OV1-4 R/B, 2124

OV1-5 DEB, 3611 (Decayed)

OV1-5 DEB, 5361

OV1-5 DEB, 5599

OV1-5 DEB, 27880 (Decayed)

OV1-4 Visibility forecast

Observer location: undefined°, undefined°
Set Observer location

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.
7 mins	2025-08-31 23:04:29.609Z	108.83° ESE	2025-08-31 23:07:29.609Z	156.808° SSE	28.062°	2025-08-31 23:11:29.609Z	216.931° SW
8 mins	2025-09-01 00:42:29.609Z	102.361° ESE	2025-09-01 00:46:29.609Z	188.856° SSW	38.18°	2025-09-01 00:50:29.609Z	246.588° WSW
9 mins	2025-09-01 02:20:29.609Z	113.221° SE	2025-09-01 02:24:29.609Z	187.817° SSW	39.126°	2025-09-01 02:29:29.609Z	262.865° W
8 mins	2025-09-01 03:59:29.609Z	143.734° SSE	2025-09-01 04:02:29.609Z	189.583° SSW	29.476°	2025-09-01 04:07:29.609Z	262.254° W