VANGUARD 2, 11
Orbit data source: Space-Track
VANGUARD 2, 11 is a payload satellite owned by NASA BSC (US) in LEO that was launched on Tue, 17 Feb 1959 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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Edit Public Description
Identifier
Orbit
Country
USRelated business
Manufacturer
NRL
Mission
Spacecraft
Bus & Motor
NRL 20", Unknown motor
Mass
10 kg wet, 10 kg dry
Launch date (UTC)
Launch vehicle
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: 9 hours ago
TLE from 9 hours ago
0 VANGUARD 2
1 00011U 59001A 25352.25212000 .00000231 00000-0 12299-3 0 9998
2 00011 32.8677 49.7671 1447572 107.4239 268.9423 11.90153247513902Epoch: 2025-12-18T06:03Z
TLE epoch observation values (Epoch: 2025-12-18T06:03:03.168Z)
Latitude
-0.00001°
Longitude
-128.10641°
Altitude
1,912.529 km
Speed
6.856 km/s
True Right ascension
03h 19m 04s
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
14:10:24
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
2,901.866 km
Perigee altitude
554.91 km
Semi-major axis
8,106.525 km
Eccentricity
0.14476
Inclination
32.8677°
RAAN
49.7671°
Arg. of periapsis
107.4239°
True anomaly
252.63513°
Mean anomaly
268.9423°
Eccentric anomaly
260.75603°
Mean motion
2.97366 °/min
Orbital period
121.06 mins
BSTAR
0.00012299
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Other satellites on launch #1 in the year 1959 (1959-02-17 UTC)
Did you know?
You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.VANGUARD 2 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 | 2025-12-19 06:22:55.143Z | 196.871° SSW | 2025-12-19 06:27:55.143Z | 158.559° S | 17.561° | 2025-12-19 06:30:55.143Z | 127.257° SE |
| 7 mins | 2025-12-19 08:31:55.143Z | 224.447° SW | 2025-12-19 08:35:55.143Z | 168.117° S | 27.801° | 2025-12-19 08:38:55.143Z | 116.584° SE |
| 5 mins | 2025-12-19 10:40:55.143Z | 234.598° WSW | 2025-12-19 10:42:55.143Z | 192.922° SSW | 27.402° | 2025-12-19 10:45:55.143Z | 129.834° 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 descending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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