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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503 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
USRelated business
Manufacturer
RCA/East Windsor
Mission
Spacecraft
Bus & Motor
RELAY, Unknown motor
Mass
78 kg wet, 78 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Unknown
Radar Cross Section
Medium (>0.1 m² and <1 m²)
Expand to show TLE details & historyLast TLE update: 22 hours ago
TLE from 22 hours ago
0 RELAY 1 (A-15)
1 00503U 62068A 25292.32921215 -.00000015 00000-0 00000-0 0 9992
2 00503 47.5314 13.3322 2837593 286.5617 82.2909 7.78162998786738Epoch: 2025-10-19T07:54Z
TLE epoch observation values (Epoch: 2025-10-19T07:54:03.929Z)
Latitude
28.94718°
Longitude
-102.93281°
Altitude
4,824.297 km
Speed
5.843 km/s
True Right ascension
02h 54m 31s
True Declination
28° 51' 16"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
01:13:39
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
7,432.269 km
Perigee altitude
1,327.026 km
Semi-major axis
10,757.785 km
Eccentricity
0.28376
Inclination
47.5314°
RAAN
13.3322°
Arg. of periapsis
286.5617°
True anomaly
114.35429°
Mean anomaly
82.2909°
Eccentric anomaly
98.3757°
Mean motion
1.94518 °/min
Orbital period
185.07 mins
BSTAR
0
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Other satellites on launch #68 in the year 1962 (1962-12-13 UTC)
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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.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. |
|---|---|---|---|---|---|---|---|
| 72 mins | 2025-10-20 08:20:16.026Z | 227.004° WSW | 2025-10-20 08:43:16.026Z | 135.658° SSE | 44.84° | 2025-10-20 09:32:16.026Z | 63.626° ENE |
| 85 mins | 2025-10-20 11:41:16.026Z | 276.325° WNW | 2025-10-20 12:19:16.026Z | 9.757° NNE | 44.161° | 2025-10-20 13:06:16.026Z | 98.616° ESE |
| 80 mins | 2025-10-20 15:08:16.026Z | 300.982° NW | 2025-10-20 15:55:16.026Z | 228.364° WSW | 43.595° | 2025-10-20 16:28:16.026Z | 150.216° SSE |
| 47 mins | 2025-10-20 18:44:16.026Z | 297.911° NW | 2025-10-20 19:11:16.026Z | 261.866° W | 20.082° | 2025-10-20 19:31:16.026Z | 222.143° SW |
| 26 mins | 2025-10-21 05:52:16.026Z | 175.159° S | 2025-10-21 06:08:16.026Z | 112.425° ESE | 33.732° | 2025-10-21 06:18:16.026Z | 81.367° E |
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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