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: 1 day ago
TLE from 1 day ago
0 RELAY 1 (A-15)
1 00503U 62068A 25340.24340291 -.00000022 00000-0 00000-0 0 9994
2 00503 47.5173 312.0980 2838679 344.5655 28.8576 7.78167308790464Epoch: 2025-12-06T05:50Z
TLE epoch observation values (Epoch: 2025-12-06T05:50:30.011Z)
Latitude
25.39796°
Longitude
174.84027°
Altitude
2,010.546 km
Speed
7.618 km/s
True Right ascension
22h 30m 57s
True Declination
25° 17' 05"
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
06:36:42
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
7,433.389 km
Perigee altitude
1,325.831 km
Semi-major axis
10,757.747 km
Eccentricity
0.28387
Inclination
47.5173°
RAAN
312.098°
Arg. of periapsis
344.5655°
True anomaly
50.88254°
Mean anomaly
28.8576°
Eccentric anomaly
39.11947°
Mean motion
1.94519 °/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. |
|---|---|---|---|---|---|---|---|
| 74 mins | 2025-12-07 10:04:41.921Z | 299.73° NW | 2025-12-07 10:35:41.921Z | 241.282° WSW | 35.136° | 2025-12-07 11:18:41.921Z | 179.946° S |
| 31 mins | 2025-12-08 00:58:41.921Z | 220.696° SW | 2025-12-08 01:06:41.921Z | 139.758° SSE | 43.922° | 2025-12-08 01:29:41.921Z | 60.25° ENE |
| 55 mins | 2025-12-08 04:12:41.921Z | 279.418° WNW | 2025-12-08 04:27:41.921Z | 5.653° NNE | 43.397° | 2025-12-08 05:07:41.921Z | 91.206° ESE |
| 62 mins | 2025-12-08 07:29:41.921Z | 299.138° NW | 2025-12-08 07:55:41.921Z | 216.252° SW | 44.605° | 2025-12-08 08:31:41.921Z | 142.163° SSE |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
Click to sort rows by RSO header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Type header in ascending order | Click to sort rows by Inclination Δ header in ascending order | Click to sort rows by RAAN Δ header in ascending order | Click to sort rows by Coplanar Angle header in ascending order | Click to sort rows by SMA Δ header in ascending order | Click to sort rows by Orbital period header in ascending order | Click to sort rows by <5km Md TCA header in descending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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