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RELAY 1 (A-15), 503

Orbit data source: Space-Track

RELAY 1 (A-15), 503 is a payload satellite owned by GSFC (US) that was launched on Thu, 13 Dec 1962 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 src="https://www.satcat.com/sats-embedded/503?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/503?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

503, 1962-068A

Orbit

Active

Country

Related business

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

RCA/East Windsor

Mission

Spacecraft

Bus & Motor

RELAY, Unknown motor

Mass

78 kg wet, 78 kg dry

Launch date (UTC)

1962-12-13 (63 years ago)

Launch vehicle

THOR DELTA B

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Unknown

Radar Cross Section

Medium (>0.1 m² and <1 m²)

Expand to show TLE details & history
Last TLE update: 2 days ago

TLE from 2 days ago

0 RELAY 1 (A-15)
1 00503U 62068A   25351.93633311 -.00000024  00000-0  00000-0 0  9992
2 00503  47.5122 297.1445 2839575 358.7426  25.4692  7.78168240791375

Epoch: 2025-12-17T22:28Z

TLE epoch observation values (Epoch: 2025-12-17T22:28:19.180Z)

Latitude

31.03635°

Longitude

-93.47202°

Altitude

1,870.404 km

Speed

7.724 km/s

True Right ascension

22h 01m 37s

True Declination

30° 54' 18"

Sunlit

Object was in daylight 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

15:30:10

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

7,434.343 km

Perigee altitude

1,324.861 km

Semi-major axis

10,757.739 km

Eccentricity

0.28396

Inclination

47.5122°

RAAN

297.1445°

Arg. of periapsis

358.7426°

True anomaly

45.45563°

Mean anomaly

25.4692°

Eccentric anomaly

34.74061°

Mean motion

1.94519 °/min

Orbital period

185.07 mins

BSTAR

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Other satellites on launch #68 in the year 1962 (1962-12-13 UTC)

DELTA 1 R/B, 515

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You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.

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RELAY 1 (A-15) Visibility forecast

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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	2025-12-19 20:38:31.842Z	130.785° SE	2025-12-19 20:41:31.842Z	109.218° ESE	12.223°	2025-12-19 20:44:31.842Z	90.996° ESE
27 mins	2025-12-19 23:45:31.842Z	235° WSW	2025-12-19 23:53:31.842Z	94.179° ESE	44.85°	2025-12-20 00:12:31.842Z	62.285° ENE
49 mins	2025-12-20 03:00:31.842Z	287.445° WNW	2025-12-20 03:13:31.842Z	14.26° NNE	43.316°	2025-12-20 03:49:31.842Z	97.351° ESE
69 mins	2025-12-20 06:16:31.842Z	298.889° NW	2025-12-20 06:38:31.842Z	219.337° SW	43.652°	2025-12-20 07:25:31.842Z	147.771° SSE
54 mins	2025-12-20 09:38:31.842Z	286.86° WNW	2025-12-20 10:00:31.842Z	247.678° W	22.934°	2025-12-20 10:32:31.842Z	205.723° SW

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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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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings

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Check out RELAY 1 (A-15), 503 on other resources

View RELAY 1 (A-15), 503 on NASA - NSSDCA Website

View RELAY 1 (A-15), 503 on Heavens-Above

View RELAY 1 (A-15), 503 on Keep Track

View RELAY 1 (A-15), 503 on Celestrak

View RELAY 1 (A-15), 503 on Gunter's Space Page

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

RELAY 1 (A-15), 503

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 2 days ago

TLE from 2 days ago

TLE epoch observation values (Epoch: 2025-12-17T22:28:19.180Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #68 in the year 1962 (1962-12-13 UTC)

RELAY 1 (A-15) Visibility forecast

Co-orbital & Co-planar RSOs

Check out RELAY 1 (A-15), 503 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 2 days ago