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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 embed code

<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

Last TLE update

21 hours ago

Origin

National Aeronautics and Space Administration (NASA) (US)

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

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

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

DELTA 1 R/B, 515

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 mins	2025-07-03 04:46:52.745Z	282.837° WNW	2025-07-03 05:05:52.745Z	1.286° NNE	41.898°	2025-07-03 05:14:52.745Z	86.612° E
15 mins	2025-07-03 08:12:52.745Z	294.637° NW	2025-07-03 08:20:52.745Z	235.577° WSW	36.71°	2025-07-03 08:27:52.745Z	154.275° SSE
58 mins	2025-07-03 22:29:52.745Z	196.58° SSW	2025-07-03 23:08:52.745Z	131.998° SE	38.585°	2025-07-03 23:27:52.745Z	63.393° ENE
44 mins	2025-07-04 01:58:52.745Z	247.951° W	2025-07-04 02:29:52.745Z	328.295° NNW	44.26°	2025-07-04 02:42:52.745Z	65.024° ENE

Authenticating...

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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.