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
Unknown
Radar Cross Section
Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 6 hours ago
TLE from 6 hours ago
0 EXPLORER 27
1 1328U 65032A 26131.18864582 -.00000100 00000-0 -22987-4 0 9990
2 1328 41.1815 175.5880 0240871 113.5945 249.0297 13.38925058983377Epoch: 2026-05-11T04:31Z
TLE epoch observation values (Epoch: 2026-05-11T04:31:38.998Z)
Latitude
-0.00004°
Longitude
-121.30549°
Altitude
1,181.206 km
Speed
7.231 km/s
True Right ascension
11h 42m 21s
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
18:40:40
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,295.845 km
Perigee altitude
934.852 km
Semi-major axis
7,493.486 km
Eccentricity
0.02409
Inclination
41.1815°
RAAN
175.588°
Arg. of periapsis
113.5945°
True anomaly
246.48067°
Mean anomaly
249.0297°
Eccentric anomaly
247.75235°
Mean motion
3.34593 °/min
Orbital period
107.59 mins
BSTAR
-0.000022987
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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. |
|---|---|---|---|---|---|---|---|
| 5 mins | 2026-05-11 10:24:15.263Z | 91.633° ESE | 2026-05-11 10:24:15.263Z | 91.633° ESE | 44.203° | 2026-05-11 10:29:15.263Z | 100.772° ESE |
| 10 mins | 2026-05-11 12:12:15.263Z | 275.659° WNW | 2026-05-11 12:17:15.263Z | 203.03° SW | 35.207° | 2026-05-11 12:22:15.263Z | 140.734° SSE |
| 10 mins | 2026-05-12 05:47:15.263Z | 210.454° SW | 2026-05-12 05:52:15.263Z | 144.435° SSE | 33.468° | 2026-05-12 05:57:15.263Z | 84.718° E |
| 11 mins | 2026-05-12 07:40:15.263Z | 254.756° W | 2026-05-12 07:45:15.263Z | 219.705° SW | 44.933° | 2026-05-12 07:51:15.263Z | 78.512° E |
| 11 mins | 2026-05-12 09:34:15.263Z | 278.988° WNW | 2026-05-12 09:39:15.263Z | 31.251° NE | 44.722° | 2026-05-12 09:45:15.263Z | 95.051° ESE |
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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