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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 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

Last TLE update

18 hours ago

Origin

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

TLE from 18 hours ago

0 OV1-4
1 02121U 66025A   25221.55370403  .00000295  00000-0  23369-4 0  9997
2 02121 144.5018 237.2102 0083888 300.8300  58.4154 13.87268301  7842

Epoch: 2025-08-09T13:17Z

TLE epoch observation values (Epoch: 2025-08-09T13:17:20.028Z)

Latitude

-0.00001°

Longitude

79.58902°

Altitude

905.478 km

Speed

7.417 km/s

True Right ascension

15h 48m 50s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

-15.59887°

Longitude

-119.49922°

Altitude

949.545 km

Speed

7.374 km/s

Apparent Right ascension

05h 13m 56s

Apparent Declination

-40° 11' 24"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

21:49:44

Azimuth

114.099° SE

Elevation

-38.647°

Doppler factor

Orbital elements

Apogee altitude

1,002.601 km

Perigee altitude

879.8 km

Semi-major axis

7,319.337 km

Eccentricity

0.00839

Inclination

144.5018°

RAAN

237.2102°

Arg. of periapsis

300.83°

True anomaly

59.23878°

Mean anomaly

58.4154°

Eccentric anomaly

58.82664°

Mean motion

3.46606 °/min

Orbital period

103.86 mins

BSTAR

0.000023369

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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°

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.
6 mins	2025-08-10 15:48:03.752Z	115.309° SE	2025-08-10 15:51:03.752Z	147.013° SSE	15.528°	2025-08-10 15:54:03.752Z	180.024° SSW
9 mins	2025-08-10 17:26:03.752Z	104.322° ESE	2025-08-10 17:30:03.752Z	166.413° S	30.845°	2025-08-10 17:35:03.752Z	225.951° WSW
9 mins	2025-08-10 19:04:03.752Z	101.027° ESE	2025-08-10 19:08:03.752Z	172.069° S	39.891°	2025-08-10 19:13:03.752Z	249.261° W
9 mins	2025-08-10 20:42:03.752Z	113.496° SE	2025-08-10 20:46:03.752Z	177.046° S	39.621°	2025-08-10 20:51:03.752Z	261.946° W
8 mins	2025-08-10 22:21:03.752Z	144.383° SSE	2025-08-10 22:25:03.752Z	209.212° SW	29.953°	2025-08-10 22:29:03.752Z	260.53° W
4 mins	2025-08-11 00:02:03.752Z	196.85° SSW	2025-08-11 00:03:03.752Z	208.676° SW	14.318°	2025-08-11 00:06:03.752Z	241.759° WSW

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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Check out OV1-4, 2121 on other resources

View OV1-4, 2121 on NASA - NSSDCA Website

View OV1-4, 2121 on Heavens-Above

View OV1-4, 2121 on Keep Track

View OV1-4, 2121 on Celestrak

View OV1-4, 2121 on Gunter's Space Page

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