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 25301.46450464 .00000015 00000-0 14916-3 0 9994
2 01328 41.1841 288.7656 0243263 181.1309 178.8916 13.38903162957276Epoch: 2025-10-28T11:08Z
TLE epoch observation values (Epoch: 2025-10-28T11:08:53.200Z)
Latitude
-0.00002°
Longitude
84.4923°
Altitude
1,295.16 km
Speed
7.122 km/s
True Right ascension
19h 15m 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
06:31:38
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,297.721 km
Perigee altitude
933.139 km
Semi-major axis
7,493.567 km
Eccentricity
0.02433
Inclination
41.1841°
RAAN
288.7656°
Arg. of periapsis
181.1309°
True anomaly
178.94393°
Mean anomaly
178.8916°
Eccentric anomaly
178.91792°
Mean motion
3.34588 °/min
Orbital period
107.6 mins
BSTAR
0.00014916
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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 | 2025-10-30 00:52:59.039Z | 191.242° SSW | 2025-10-30 00:58:59.039Z | 139.907° SSE | 24.223° | 2025-10-30 01:04:59.039Z | 88.481° E |
| 13 mins | 2025-10-30 02:45:59.039Z | 234.179° WSW | 2025-10-30 02:51:59.039Z | 165.398° S | 42.471° | 2025-10-30 02:58:59.039Z | 77.511° E |
| 13 mins | 2025-10-30 04:39:59.039Z | 268.026° W | 2025-10-30 04:45:59.039Z | 334.017° NNW | 44.712° | 2025-10-30 04:52:59.039Z | 83.927° E |
| 12 mins | 2025-10-30 06:33:59.039Z | 282.006° WNW | 2025-10-30 06:39:59.039Z | 224.207° SW | 44.775° | 2025-10-30 06:45:59.039Z | 109.248° ESE |
| 10 mins | 2025-10-30 08:28:59.039Z | 269.71° W | 2025-10-30 08:32:59.039Z | 222.249° SW | 30.655° | 2025-10-30 08:38:59.039Z | 151.031° 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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