VANGUARD 1, 5
Orbit data source: Space-Track
VANGUARD 1, 5 is a payload satellite owned by NRL (US) in LEO that was launched on Mon, 17 Mar 1958 UTC via a VANGUARD 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
Orbit
Country
USRelated business
Manufacturer
NRL
Mission
Spacecraft
Bus & Motor
NRL 6", Unknown motor
Mass
2 kg wet, 2 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
SPHERE, 0.1 m
Radar Cross Section
Medium (>0.1 m² and <1 m²)
Expand to show TLE details & historyLast TLE update: 14 hours ago
TLE from 14 hours ago
0 VANGUARD 1
1 5U 58002B 26247.56862957 .00000274 00000-0 36003-3 0 9997
2 5 34.2435 69.3292 1837099 136.4718 239.6461 10.86044898451915Epoch: 2026-09-04T13:38Z
TLE epoch observation values (Epoch: 2026-09-04T13:38:49.594Z)
Latitude
-0°
Longitude
-119.06802°
Altitude
3,220.935 km
Speed
6.066 km/s
True Right ascension
04h 37m 19s
True Declination
0° 00' 00"
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
19:42:03
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
3,820.874 km
Perigee altitude
655.133 km
Semi-major axis
8,616.141 km
Eccentricity
0.18371
Inclination
34.2435°
RAAN
69.3292°
Arg. of periapsis
136.4718°
True anomaly
223.58462°
Mean anomaly
239.6461°
Eccentric anomaly
231.41792°
Mean motion
2.71378 °/min
Orbital period
132.66 mins
BSTAR
0.00036003
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Other satellites on launch #2 in the year 1958 (1958-03-17 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.VANGUARD 1 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. |
|---|---|---|---|---|---|---|---|
| 4 mins | 2026-09-05 11:47:27.045Z | 149.164° SSE | 2026-09-05 11:49:27.045Z | 142.603° SSE | 10.387° | 2026-09-05 11:51:27.045Z | 135.639° SSE |
| 20 mins | 2026-09-05 14:00:27.045Z | 204.338° SW | 2026-09-05 14:12:27.045Z | 155.112° SSE | 26.878° | 2026-09-05 14:20:27.045Z | 101.491° ESE |
| 17 mins | 2026-09-05 16:23:27.045Z | 238.079° WSW | 2026-09-05 16:34:27.045Z | 167.695° S | 37.847° | 2026-09-05 16:40:27.045Z | 98.377° ESE |
| 11 mins | 2026-09-05 18:48:27.045Z | 259.214° W | 2026-09-05 18:54:27.045Z | 202.725° SW | 37.94° | 2026-09-05 18:59:27.045Z | 115.11° SE |
| 5 mins | 2026-09-05 21:11:27.045Z | 245.739° WSW | 2026-09-05 21:14:27.045Z | 203.039° SW | 18.764° | 2026-09-05 21:16:27.045Z | 171.916° S |
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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