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RELAY 2, 737

Orbit data source: Space-Track

RELAY 2, 737 is a payload satellite owned by GSFC (US) that was launched on Tue, 21 Jan 1964 UTC via a THOR DELTA B 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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Iframe embed code

<iframe src="https://www.satcat.com/sats-embedded/737?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/737?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

737, 1964-003A

Orbit

Active

Last TLE update

1 day ago

Origin

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

RCA/East Windsor

Mission

Civil Communications

Bus & Motor

RELAY, Unknown motor

Mass

83 kg wet, 83 kg dry

Launch date (UTC)

1964-01-21 (61 years ago)

Launch vehicle

THOR DELTA B

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Oct Cyl, 0.81 m

Radar Cross Section

0.652 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history

TLE from 1 day ago

0 RELAY 2
1 00737U 64003A   25187.55780108 -.00000017  00000-0  00000-0 0  9996
2 00737  46.4709  14.7642 2597164 353.6740   3.6281  7.39537248660522

Epoch: 2025-07-06T13:23Z

TLE epoch observation values (Epoch: 2025-07-06T13:23:14.013Z)

Latitude

-0.00003°

Longitude

-110.82399°

Altitude

1,870.787 km

Speed

7.8 km/s

True Right ascension

00h 59m 03s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

45.16564°

Longitude

-40.10154°

Altitude

3,660.333 km

Speed

6.608 km/s

Apparent Right ascension

03h 21m 43s

Apparent Declination

44° 32' 56"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

07:06:25

Azimuth

295.589° NW

Elevation

48.972°

Doppler factor

Orbital elements

Apogee altitude

7,641.533 km

Perigee altitude

1,860.648 km

Semi-major axis

11,129.227 km

Eccentricity

0.25972

Inclination

46.4709°

RAAN

14.7642°

Arg. of periapsis

353.674°

True anomaly

Unknown

Mean anomaly

3.6281°

Eccentric anomaly

Unknown

Mean motion

1.84861 °/min

Orbital period

194.74 mins

BSTAR

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Other satellites on launch #3 in the year 1964 (1964-01-21 UTC)

DELTA 1 R/B, 738

RELAY 2 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.
50 mins	2025-07-07 19:02:54.729Z	295.397° NW	2025-07-07 19:10:54.729Z	1.644° NNE	43.923°	2025-07-07 19:52:54.729Z	97.272° ESE
76 mins	2025-07-07 22:22:54.729Z	298.342° NW	2025-07-07 22:49:54.729Z	220.677° SW	43.435°	2025-07-07 23:38:54.729Z	148.796° SSE
55 mins	2025-07-08 01:58:54.729Z	287.378° WNW	2025-07-08 02:22:54.729Z	250.257° W	20.961°	2025-07-08 02:53:54.729Z	210.851° SW
27 mins	2025-07-08 14:08:54.729Z	198.387° SSW	2025-07-08 14:17:54.729Z	131.549° SE	37.279°	2025-07-08 14:35:54.729Z	60.819° ENE
47 mins	2025-07-08 17:32:54.729Z	266.157° W	2025-07-08 17:45:54.729Z	342.41° N	43.947°	2025-07-08 18:19:54.729Z	80.569° E

Authenticating...

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Check out RELAY 2, 737 on other resources

View RELAY 2, 737 on NASA - NSSDCA Website

View RELAY 2, 737 on Heavens-Above

View RELAY 2, 737 on Keep Track

View RELAY 2, 737 on Celestrak

View RELAY 2, 737 on Gunter's Space Page

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