VANGUARD R/B, 12
Orbit data source: Space-Track
VANGUARD R/B, 12 is space debris in LEO originally from a launch on Tue, 17 Feb 1959 UTC launched from the Air Force Eastern Test Range (AFETR). Debris objects in space refer to the collection of defunct objects orbiting the Earth. Examples of debris include non-operational satellites, rocket bodies, and fragments generated from explosions, collisions, or faulty payload assembly.
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Identifier
Orbit
Country
USRelated business
Manufacturer
GCR/Redlands
Mission
Spacecraft
Bus & Motor
33-KS-2800, Unknown motor
Mass
22 kg wet, 22 kg dry
Launch date (UTC)
Launch vehicle
Unknown
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: 13 hours ago
TLE from 13 hours ago
0 VANGUARD R/B
1 12U 59001B 26151.72585135 .00000246 00000-0 14530-3 0 9997
2 12 32.8997 283.2227 1646575 18.0170 347.2370 11.48613173529434Epoch: 2026-05-31T17:25Z
TLE epoch observation values (Epoch: 2026-05-31T17:25:13.556Z)
Latitude
0.00002°
Longitude
132.69285°
Altitude
600.33 km
Speed
8.138 km/s
True Right ascension
18h 52m 53s
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
16:19:26
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
3,289.326 km
Perigee altitude
555.784 km
Semi-major axis
8,300.692 km
Eccentricity
0.16466
Inclination
32.8997°
RAAN
283.2227°
Arg. of periapsis
18.017°
True anomaly
342.04247°
Mean anomaly
347.237°
Eccentric anomaly
344.75656°
Mean motion
2.86993 °/min
Orbital period
125.44 mins
BSTAR
0.0001453
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Other satellites on launch #1 in the year 1959 (1959-02-17 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 R/B 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. |
|---|---|---|---|---|---|---|---|
| 8 mins | 2026-06-01 12:24:50.860Z | 199.757° SSW | 2026-06-01 12:27:50.860Z | 156.474° SSE | 20.573° | 2026-06-01 12:32:50.860Z | 102.459° ESE |
| 13 mins | 2026-06-01 14:35:50.860Z | 239.526° WSW | 2026-06-01 14:39:50.860Z | 177.544° S | 37.244° | 2026-06-01 14:48:50.860Z | 101.801° ESE |
| 18 mins | 2026-06-01 16:47:50.860Z | 253.61° W | 2026-06-01 16:53:50.860Z | 183.044° SSW | 36.632° | 2026-06-01 17:05:50.860Z | 123.037° SE |
| 21 mins | 2026-06-01 18:59:50.860Z | 255.582° W | 2026-06-01 19:07:50.860Z | 205.238° SW | 26.639° | 2026-06-01 19:20:50.860Z | 153.911° SSE |
| 5 mins | 2026-06-01 21:20:50.860Z | 225.329° WSW | 2026-06-01 21:22:50.860Z | 218.107° SW | 10.884° | 2026-06-01 21:25:50.860Z | 207.902° SW |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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