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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>

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

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Identifier

2121, 1966-025A

Orbit

LEO

Last TLE update

1 day 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, 1.4 m

Radar Cross Section

0.946 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history

TLE from 1 day ago

0 OV1-4
1  2121U 66025A   25108.54272464  .00000406  00000-0  11442-3 0  9990
2  2121 144.5042  29.1790 0083659 214.7416 144.7770 13.87251130992564

Epoch: 2025-04-18T13:01Z

Definitive object data (Epoch: 2025-04-18T13:01:31.408Z)

Latitude

0.00001°

Longitude

-13.10066°

Altitude

987.463 km

Speed

7.335 km/s

True Right ascension

01h 56m 42s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at TLE epoch

Visualization TLE readout

Latitude

19.79582°

Longitude

-36.32824°

Altitude

997.303 km

Speed

7.326 km/s

Apparent Right ascension

21h 36m 43s

Apparent Declination

-13° 08' 39"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

04:53:49

Azimuth

271.983° WNW

Elevation

-23.107°

Doppler factor

Orbital elements

Apogee altitude

1,002.494 km

Perigee altitude

880.028 km

Semi-major axis

7,319.398 km

Eccentricity

0.0083659

Inclination

144.5042°

RAAN

29.179°

Arg. of periapsis

214.7416°

True anomaly

145.32522°

Mean anomaly

144.777°

Eccentric anomaly

145.05158°

Mean motion

3.46601 °/min

BSTAR

0.00011442

Orbital period

103.87 mins

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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

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.
8 mins	2025-04-20 10:29:16.844Z	107.195° ESE	2025-04-20 10:33:16.844Z	160.35° S	23.592°	2025-04-20 10:37:16.844Z	208.336° SW
9 mins	2025-04-20 12:07:16.844Z	99.364° ESE	2025-04-20 12:11:16.844Z	162.587° S	36.936°	2025-04-20 12:16:16.844Z	239.361° WSW
10 mins	2025-04-20 13:45:16.844Z	105.359° ESE	2025-04-20 13:49:16.844Z	163.114° S	40.451°	2025-04-20 13:55:16.844Z	260.21° W
10 mins	2025-04-20 15:23:16.844Z	125.602° SE	2025-04-20 15:28:16.844Z	205.459° SW	35.619°	2025-04-20 15:33:16.844Z	265.908° W
7 mins	2025-04-20 17:03:16.844Z	166.599° S	2025-04-20 17:06:16.844Z	205.447° SW	22.244°	2025-04-20 17:10:16.844Z	253.363° W

Authenticating...

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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.