Showing default

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.

Loading next visibility...

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

Optional Secondary NORAD IDs

Max 10 NORAD IDs; Separated by commas

Initial load time (optional)

ISO8601 Format

TLE date request (optional)

ISO8601 Format

Identifier

503, 1962-068A

Orbit

Active

Last TLE update

1 day 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, 0.4 m

Radar Cross Section

0.652 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history

TLE from 1 day ago

0 RELAY 1 (A-15)
1 00503U 62068A   25200.28621257 -.00000023  00000-0  00000-0 0  9998
2 00503  47.5012 130.9755 2839017 175.0273 355.3749  7.78158013779564

Epoch: 2025-07-19T06:52Z

TLE epoch observation values (Epoch: 2025-07-19T06:52:08.766Z)

Latitude

9.99547°

Longitude

-98.63136°

Altitude

1,343.831 km

Speed

8.137 km/s

True Right ascension

20h 06m 55s

True Declination

9° 56' 29"

Sunlit

Object was in full shadow at epoch

Visualization orbit readout

Latitude

29.34658°

Longitude

120.08389°

Altitude

5,986.558 km

Speed

5.239 km/s

Apparent Right ascension

10h 40m 31s

Apparent Declination

7° 09' 46"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

22:37:46

Azimuth

359.066° N

Elevation

-42.917°

Doppler factor

Orbital elements

Apogee altitude

7,433.865 km

Perigee altitude

1,325.53 km

Semi-major axis

10,757.835 km

Eccentricity

0.2839

Inclination

47.5012°

RAAN

130.9755°

Arg. of periapsis

175.0273°

True anomaly

351.36622°

Mean anomaly

355.3749°

Eccentric anomaly

353.54666°

Mean motion

1.94516 °/min

Orbital period

185.07 mins

BSTAR

Loading maneuver chart data...

Loading SW <> Apogee altitude chart data...

Loading historical data...

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.
61 mins	2025-07-20 18:12:31.693Z	164.671° S	2025-07-20 18:48:31.693Z	116.509° SE	27.29°	2025-07-20 19:13:31.693Z	67.46° ENE
67 mins	2025-07-20 21:26:31.693Z	219.293° SW	2025-07-20 22:11:31.693Z	147.828° SSE	44.496°	2025-07-20 22:33:31.693Z	60.784° ENE
44 mins	2025-07-21 01:04:31.693Z	270.037° WNW	2025-07-21 01:36:31.693Z	359.304° N	42.954°	2025-07-21 01:48:31.693Z	78.203° E
24 mins	2025-07-21 04:39:31.693Z	299.096° NW	2025-07-21 04:55:31.693Z	200.865° SSW	43.905°	2025-07-21 05:03:31.693Z	134.678° SE

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 ascending order

Authenticating...

Click to sort rows by Secondary header in ascending order	Click to sort rows by Secondary name header in ascending order	Click to sort rows by Country header in ascending order	Click to sort rows by Owner header in ascending order	Click to sort rows by Obj. Type header in ascending order	Click to sort rows by Miss dist. header in ascending order	Click to sort rows by Rel. speed header in ascending order	Click to sort rows by Apr. angle header in ascending order	Click to sort rows by TCA header in ascending order

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.