EXPLORER 27, 1328
Orbit data source: Space-Track
EXPLORER 27, 1328 is a payload satellite owned by GSFC (US) in LEO that was launched on Thu, 29 Apr 1965 UTC via an SCOUT X-4 launch vehicle from the Wallops Island (WLPIS). 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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1328 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
USRelated business
Manufacturer
APL
Mission
Spacecraft
Bus & Motor
TRANSIT 5, Unknown motor
Mass
55 kg wet, 55 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Unknown
Radar Cross Section
Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 1 day ago
TLE from 1 day ago
0 EXPLORER 27
1 01328U 65032A 25315.26632125 .00000011 00000-0 13920-3 0 9993
2 01328 41.1844 229.7123 0243972 252.7676 104.6242 13.38906148959124Epoch: 2025-11-11T06:23Z
TLE epoch observation values (Epoch: 2025-11-11T06:23:30.155Z)
Latitude
-0°
Longitude
83.18131°
Altitude
1,163.239 km
Speed
7.249 km/s
True Right ascension
15h 18m 50s
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
06:56:41
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,298.241 km
Perigee altitude
932.597 km
Semi-major axis
7,493.556 km
Eccentricity
0.0244
Inclination
41.1844°
RAAN
229.7123°
Arg. of periapsis
252.7676°
True anomaly
107.30768°
Mean anomaly
104.6242°
Eccentric anomaly
105.96812°
Mean motion
3.34589 °/min
Orbital period
107.59 mins
BSTAR
0.0001392
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Other satellites on launch #32 in the year 1965 (1965-04-29 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.EXPLORER 27 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. |
|---|---|---|---|---|---|---|---|
| 12 mins | 2025-11-12 20:07:55.317Z | 191.915° SSW | 2025-11-12 20:13:55.317Z | 137.118° SSE | 25.288° | 2025-11-12 20:19:55.317Z | 87.035° E |
| 14 mins | 2025-11-12 22:00:55.317Z | 235.675° WSW | 2025-11-12 22:06:55.317Z | 158.218° S | 43.137° | 2025-11-12 22:14:55.317Z | 76.36° E |
| 15 mins | 2025-11-12 23:53:55.317Z | 268.558° W | 2025-11-13 00:00:55.317Z | 332.248° NNW | 44.722° | 2025-11-13 00:08:55.317Z | 85.175° E |
| 14 mins | 2025-11-13 01:48:55.317Z | 282.156° WNW | 2025-11-13 01:54:55.317Z | 246.991° WSW | 44.434° | 2025-11-13 02:02:55.317Z | 110.708° ESE |
| 12 mins | 2025-11-13 03:42:55.317Z | 275.49° WNW | 2025-11-13 03:48:55.317Z | 215.607° SW | 32.394° | 2025-11-13 03:54:55.317Z | 153.281° SSE |
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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