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OPS 3674 (VELA 4), 837

Orbit data source: Space-Track

OPS 3674 (VELA 4), 837 is a payload satellite owned by USAF SSD (US) in HEO that was launched on Fri, 17 Jul 1964 UTC via an ATLAS AGENA D launch vehicle from the Air Force Eastern Test Range (AFETR). 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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https://www.satcat.com/sats-embedded/837?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

837, 1964-040B

Orbit

HEO

Last TLE update

4 weeks ago

Origin

United States Space Force (US)

Manufacturer

TRW

Mission

Defense Early Warn

Bus & Motor

VELA, BE-3

Mass

~217 kg wet, 125 kg dry

Launch date (UTC)

1964-07-17 (61 years ago)

Launch vehicle

ATLAS AGENA D

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Poly, 1.4 m

Radar Cross Section

2.240 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history

TLE from 4 weeks ago

0 OPS 3674 (VELA 4)
1 00837U 64040B   25104.64541123  .00000407  00000-0  00000-0 0  9991
2 00837  48.6998 131.9020 4420611 260.1689   0.5585  0.24000412 53699

Epoch: 2025-04-14T15:29Z

Definitive object data (Epoch: 2025-04-14T15:29:23.53Z)

Latitude

-47.67315°

Longitude

-47.76481°

Altitude

54,123.65 km

Speed

3.088 km/s

True Right ascension

01h 50m 33s

True Declination

-47° 39' 11"

Sunlit

Object was in daylight at TLE epoch

Visualization TLE readout

Latitude

-33.04202°

Longitude

20.6947°

Altitude

61,869.411 km

Speed

2.835 km/s

Apparent Right ascension

06h 33m 35s

Apparent Declination

-37° 59' 12"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

04:41:59

Azimuth

158.136° S

Elevation

8.009°

Doppler factor

Orbital elements

Apogee altitude

151,349.203 km

Perigee altitude

54,647.168 km

Semi-major axis

109,376.322 km

Eccentricity

0.4420611

Inclination

48.6998°

RAAN

131.902°

Arg. of periapsis

260.1689°

True anomaly

1.60916°

Mean anomaly

0.5585°

Eccentric anomaly

1.00097°

Mean motion

0.06 °/min

BSTAR

Unknown

Orbital period

5999.9 mins

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Other satellites on launch #40 in the year 1964 (1964-07-17 UTC)

OPS 3662 (VELA 3), 836

ERS 13, 838 (Decayed)

OPS 3674 (VELA 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.
546 mins	2025-05-09 20:48:50.869Z	159.48° S	2025-05-10 01:23:50.869Z	207.049° SW	28.009°	2025-05-10 05:54:50.869Z	265.024° W
28 mins	2025-05-10 20:02:50.869Z	58.794° ENE	2025-05-10 20:30:50.869Z	61.637° ENE	14.388°	2025-05-10 20:30:50.869Z	61.637° ENE

Authenticating...

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Check out OPS 3674 (VELA 4), 837 on other resources

View OPS 3674 (VELA 4), 837 on NASA - NSSDCA Website

View OPS 3674 (VELA 4), 837 on Heavens-Above

View OPS 3674 (VELA 4), 837 on Keep Track

View OPS 3674 (VELA 4), 837 on Celestrak

View OPS 3674 (VELA 4), 837 on Gunter's Space Page

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