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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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: 11 hours ago
TLE from 11 hours ago
0 VANGUARD 2
1 00011U 59001A 26071.99183624 .00000986 00000-0 50142-3 0 9993
2 00011 32.8733 89.1658 1445751 229.4824 117.0719 11.90274636524001Epoch: 2026-03-12T23:48Z
TLE epoch observation values (Epoch: 2026-03-12T23:48:14.651Z)
Latitude
-0.00001°
Longitude
-78.52904°
Altitude
2,377.481 km
Speed
6.472 km/s
True Right ascension
05h 56m 39s
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
15:39:37
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
2,899.758 km
Perigee altitude
555.914 km
Semi-major axis
8,105.973 km
Eccentricity
0.14458
Inclination
32.8733°
RAAN
89.1658°
Arg. of periapsis
229.4824°
True anomaly
130.57521°
Mean anomaly
117.0719°
Eccentric anomaly
123.94381°
Mean motion
2.97396 °/min
Orbital period
121.05 mins
BSTAR
0.00050142
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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 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. |
|---|---|---|---|---|---|---|---|
| 24 mins | 2026-03-14 02:02:40.962Z | 186.051° SSW | 2026-03-14 02:13:40.962Z | 140.297° SSE | 23.475° | 2026-03-14 02:26:40.962Z | 92.005° ESE |
| 30 mins | 2026-03-14 04:09:40.962Z | 223.331° SW | 2026-03-14 04:23:40.962Z | 160.746° S | 37.948° | 2026-03-14 04:39:40.962Z | 87.685° E |
| 30 mins | 2026-03-14 06:19:40.962Z | 251.852° W | 2026-03-14 06:35:40.962Z | 177.081° S | 42.542° | 2026-03-14 06:49:40.962Z | 98.507° ESE |
| 26 mins | 2026-03-14 08:31:40.962Z | 268.737° W | 2026-03-14 08:46:40.962Z | 199.281° SSW | 40.309° | 2026-03-14 08:57:40.962Z | 123.009° SE |
| 17 mins | 2026-03-14 10:45:40.962Z | 268.042° W | 2026-03-14 10:55:40.962Z | 218.469° SW | 26.319° | 2026-03-14 11:02:40.962Z | 167.226° 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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