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: 10 hours ago
TLE from 10 hours ago
0 EXPLORER 27
1 1328U 65032A 26037.78074458 -.00000028 00000-0 87242-4 0 9999
2 1328 41.1817 215.2636 0242381 347.6167 11.8704 13.38915908970854Epoch: 2026-02-06T18:44Z
TLE epoch observation values (Epoch: 2026-02-06T18:44:16.331Z)
Latitude
-0.00002°
Longitude
157.28183°
Altitude
935.452 km
Speed
7.472 km/s
True Right ascension
14h 21m 03s
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
06:35:16
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,297.011 km
Perigee altitude
933.754 km
Semi-major axis
7,493.52 km
Eccentricity
0.02424
Inclination
41.1817°
RAAN
215.2636°
Arg. of periapsis
347.6167°
True anomaly
12.45915°
Mean anomaly
11.8704°
Eccentric anomaly
12.163°
Mean motion
3.34591 °/min
Orbital period
107.59 mins
BSTAR
0.000087242
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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. |
|---|---|---|---|---|---|---|---|
| 11 mins | 2026-02-07 14:36:29.875Z | 212.192° SW | 2026-02-07 14:41:29.875Z | 154.286° SSE | 32.952° | 2026-02-07 14:47:29.875Z | 83.003° E |
| 13 mins | 2026-02-07 16:29:29.875Z | 254.182° W | 2026-02-07 16:35:29.875Z | 96.372° ESE | 44.726° | 2026-02-07 16:42:29.875Z | 78.448° E |
| 13 mins | 2026-02-07 18:23:29.875Z | 278.331° WNW | 2026-02-07 18:29:29.875Z | 51.944° ENE | 44.647° | 2026-02-07 18:36:29.875Z | 95.198° ESE |
| 13 mins | 2026-02-07 20:17:29.875Z | 279.51° WNW | 2026-02-07 20:23:29.875Z | 189.642° SSW | 41.162° | 2026-02-07 20:30:29.875Z | 127.719° SE |
| 10 mins | 2026-02-07 22:11:29.875Z | 263.225° W | 2026-02-07 22:16:29.875Z | 217.905° SW | 21.896° | 2026-02-07 22:21:29.875Z | 175.962° S |
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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