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: 21 hours ago
TLE from 21 hours ago
0 VANGUARD 2
1 11U 59001A 26151.44263714 .00001909 00000-0 99701-3 0 9991
2 11 32.8692 148.5361 1445122 321.5749 29.0068 11.90461364533474Epoch: 2026-05-31T10:37Z
TLE epoch observation values (Epoch: 2026-05-31T10:37:23.848Z)
Latitude
-0.00001°
Longitude
100.24247°
Altitude
747.589 km
Speed
7.919 km/s
True Right ascension
09h 54m 08s
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
17:11:07
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
2,898.279 km
Perigee altitude
555.7 km
Semi-major axis
8,105.126 km
Eccentricity
0.14451
Inclination
32.8692°
RAAN
148.5361°
Arg. of periapsis
321.5749°
True anomaly
38.4856°
Mean anomaly
29.0068°
Eccentric anomaly
33.58732°
Mean motion
2.97443 °/min
Orbital period
121.03 mins
BSTAR
0.00099701
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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. |
|---|---|---|---|---|---|---|---|
| 4 mins | 2026-06-01 07:32:23.483Z | 118.795° SE | 2026-06-01 07:32:23.483Z | 118.795° SE | 20.191° | 2026-06-01 07:36:23.483Z | 115.06° SE |
| 28 mins | 2026-06-01 09:18:23.483Z | 268.26° W | 2026-06-01 09:30:23.483Z | 210.773° SW | 34.214° | 2026-06-01 09:46:23.483Z | 144.473° SSE |
| 18 mins | 2026-06-01 11:32:23.483Z | 254.699° W | 2026-06-01 11:40:23.483Z | 225.17° WSW | 17.976° | 2026-06-01 11:50:23.483Z | 187.981° SSW |
| 16 mins | 2026-06-02 03:06:23.483Z | 209.727° SW | 2026-06-02 03:12:23.483Z | 145.897° SSE | 32.166° | 2026-06-02 03:22:23.483Z | 90.625° ESE |
| 23 mins | 2026-06-02 05:12:23.483Z | 248.662° W | 2026-06-02 05:20:23.483Z | 182.984° SSW | 41.396° | 2026-06-02 05:35:23.483Z | 98.931° ESE |
| 12 mins | 2026-06-02 07:20:23.483Z | 265.323° W | 2026-06-02 07:31:23.483Z | 193.629° SSW | 40.332° | 2026-06-02 07:32:23.483Z | 180.683° SSW |
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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