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, 2.3 m
Radar Cross Section
Medium (>0.1 m² and <1 m²)
Expand to show TLE details & historyLast TLE update: 14 hours ago
TLE from 14 hours ago
0 EXPLORER 27
1 01328U 65032A 26208.33098222 -.00000034 00000-0 75743-4 0 9995
2 01328 41.1810 205.5110 0240515 154.8509 206.4179 13.38930810993718Epoch: 2026-07-27T07:56Z
TLE epoch observation values (Epoch: 2026-07-27T07:56:36.863Z)
Latitude
-0.00005°
Longitude
141.34125°
Altitude
1,275.048 km
Speed
7.141 km/s
True Right ascension
13h 42m 02s
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
11:23:42
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,295.556 km
Perigee altitude
935.098 km
Semi-major axis
7,493.464 km
Eccentricity
0.02405
Inclination
41.181°
RAAN
205.511°
Arg. of periapsis
154.8509°
True anomaly
205.22394°
Mean anomaly
206.4179°
Eccentric anomaly
205.81775°
Mean motion
3.34595 °/min
Orbital period
107.59 mins
BSTAR
0.000075743
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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 | 2026-07-28 01:59:48.155Z | 194.968° SSW | 2026-07-28 02:05:48.155Z | 136.987° SSE | 25.69° | 2026-07-28 02:10:48.155Z | 89.82° E |
| 12 mins | 2026-07-28 03:52:48.155Z | 238.845° WSW | 2026-07-28 03:58:48.155Z | 147.436° SSE | 43.284° | 2026-07-28 04:04:48.155Z | 77.79° E |
| 12 mins | 2026-07-28 05:46:48.155Z | 271.157° WNW | 2026-07-28 05:52:48.155Z | 39.872° NE | 44.35° | 2026-07-28 05:58:48.155Z | 85.758° E |
| 11 mins | 2026-07-28 07:40:48.155Z | 281.85° WNW | 2026-07-28 07:45:48.155Z | 238.723° WSW | 43.909° | 2026-07-28 07:51:48.155Z | 113.653° SE |
| 9 mins | 2026-07-28 09:34:48.155Z | 268.932° W | 2026-07-28 09:38:48.155Z | 223.914° SW | 26.567° | 2026-07-28 09:43:48.155Z | 161.222° 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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