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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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
OCT CYL + 4 PAN, 1.1 m
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 EXPLORER 27
1 01328U 65032A 26264.58404590 -.00000128 00000-0 -65617-4 0 9997
2 01328 41.1846 324.8153 0239868 87.1814 275.6365 13.38934771 1260Epoch: 2026-09-21T14:01Z
TLE epoch observation values (Epoch: 2026-09-21T14:01:01.565Z)
Latitude
0.00001°
Longitude
114.09701°
Altitude
1,099.494 km
Speed
7.311 km/s
True Right ascension
21h 39m 15s
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
14:52:02
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,295.056 km
Perigee altitude
935.568 km
Semi-major axis
7,493.449 km
Eccentricity
0.02399
Inclination
41.1846°
RAAN
324.8153°
Arg. of periapsis
87.1814°
True anomaly
272.89407°
Mean anomaly
275.6365°
Eccentric anomaly
274.26597°
Mean motion
3.34596 °/min
Orbital period
107.59 mins
BSTAR
-0.000065617
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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. |
|---|---|---|---|---|---|---|---|
| 10 mins | 2026-09-22 06:16:23.301Z | 194.811° SSW | 2026-09-22 06:21:23.301Z | 146.036° SSE | 24.553° | 2026-09-22 06:26:23.301Z | 92.099° ESE |
| 11 mins | 2026-09-22 08:09:23.301Z | 238.3° WSW | 2026-09-22 08:14:23.301Z | 170.95° S | 67.754° | 2026-09-22 08:20:23.301Z | 77.752° E |
| 11 mins | 2026-09-22 10:03:23.301Z | 271.941° WNW | 2026-09-22 10:08:23.301Z | 26.929° NE | 77.873° | 2026-09-22 10:14:23.301Z | 85.304° E |
| 10 mins | 2026-09-22 11:57:23.301Z | 281.308° WNW | 2026-09-22 12:01:23.301Z | 241.084° WSW | 74.518° | 2026-09-22 12:07:23.301Z | 112.874° SE |
| 9 mins | 2026-09-22 13:51:23.301Z | 262.055° W | 2026-09-22 13:55:23.301Z | 205.884° SW | 31.017° | 2026-09-22 14:00:23.301Z | 155.256° 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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