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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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Identifier
503, 1962-068A
Orbit
Active
Last TLE update
21 hours ago
Origin
Manufacturer
RCA/East Windsor
Mission
Civil Communications
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
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 21 hours ago
0 RELAY 1 (A-15)
1 00503U 62068A   25183.32322691 -.00000026  00000-0  00000-0 0  9996
2 00503  47.4941 152.6726 2840034 154.4427 355.7984  7.78158195778246
Epoch: 2025-07-02T07:45Z
TLE epoch observation values (Epoch: 2025-07-02T07:45:26.805Z)
Latitude
24.02454°
Longitude
-88.2745°
Altitude
1,340.047 km
Speed
8.142 km/s
True Right ascension
20h 34m 46s
True Declination
23° 54' 24"
Sunlit
Object was in full shadow at epoch
Visualization orbit readout
Latitude
26.00651°
Longitude
141.05633°
Altitude
5,095.16 km
Speed
5.697 km/s
Apparent Right ascension
09h 59m 21s
Apparent Declination
5° 36' 31"
Sunlit
Object is in daylight
Visualization observer readout
Local Sidereal Time
16:23:15
Azimuth
278.132° WNW
Elevation
-0.96°
Doppler factor
1
Orbital elements
Apogee altitude
7,434.958 km
Perigee altitude
1,324.435 km
Semi-major axis
10,757.834 km
Eccentricity
0.284
Inclination
47.4941°
RAAN
152.6726°
Arg. of periapsis
154.4427°
True anomaly
Unknown
Mean anomaly
355.7984°
Eccentric anomaly
Unknown
Mean motion
1.94516 °/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)

RELAY 1 (A-15) 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.
28 mins2025-07-03 04:46:52.745Z282.837° WNW2025-07-03 05:05:52.745Z1.286° NNE41.898°2025-07-03 05:14:52.745Z86.612° E
15 mins2025-07-03 08:12:52.745Z294.637° NW2025-07-03 08:20:52.745Z235.577° WSW36.71°2025-07-03 08:27:52.745Z154.275° SSE
58 mins2025-07-03 22:29:52.745Z196.58° SSW2025-07-03 23:08:52.745Z131.998° SE38.585°2025-07-03 23:27:52.745Z63.393° ENE
44 mins2025-07-04 01:58:52.745Z247.951° W2025-07-04 02:29:52.745Z328.295° NNW44.26°2025-07-04 02:42:52.745Z65.024° ENE
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