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: 8 hours ago
TLE from 8 hours ago
0 VANGUARD 2
1 00011U 59001A 26077.61258348 .00000827 00000-0 41723-3 0 9993
2 00011 32.8768 67.9037 1445787 261.4526 82.0136 11.90283883524679Epoch: 2026-03-18T14:42Z
TLE epoch observation values (Epoch: 2026-03-18T14:42:07.212Z)
Latitude
-0.00001°
Longitude
31.19978°
Altitude
1,729.562 km
Speed
7.012 km/s
True Right ascension
04h 31m 36s
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
03:08:23
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
2,899.738 km
Perigee altitude
555.849 km
Semi-major axis
8,105.931 km
Eccentricity
0.14458
Inclination
32.8768°
RAAN
67.9037°
Arg. of periapsis
261.4526°
True anomaly
98.60689°
Mean anomaly
82.0136°
Eccentric anomaly
90.29724°
Mean motion
2.97399 °/min
Orbital period
121.05 mins
BSTAR
0.00041723
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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. |
|---|---|---|---|---|---|---|---|
| 22 mins | 2026-03-19 00:51:54.586Z | 188.298° SSW | 2026-03-19 01:01:54.586Z | 137.741° SSE | 24.424° | 2026-03-19 01:13:54.586Z | 90.874° ESE |
| 29 mins | 2026-03-19 02:58:54.586Z | 226.241° WSW | 2026-03-19 03:11:54.586Z | 152.475° SSE | 39.026° | 2026-03-19 03:27:54.586Z | 87.716° E |
| 31 mins | 2026-03-19 05:07:54.586Z | 254.795° W | 2026-03-19 05:22:54.586Z | 180.987° SSW | 42.856° | 2026-03-19 05:38:54.586Z | 100.835° ESE |
| 29 mins | 2026-03-19 07:18:54.586Z | 270.195° WNW | 2026-03-19 07:34:54.586Z | 197.747° SSW | 40.233° | 2026-03-19 07:47:54.586Z | 126.495° SE |
| 21 mins | 2026-03-19 09:32:54.586Z | 268.527° W | 2026-03-19 09:43:54.586Z | 222.821° SW | 27.019° | 2026-03-19 09:53:54.586Z | 166.244° 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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