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: 14 hours ago
TLE from 14 hours ago
0 EXPLORER 27
1 1328U 65032A 26040.91438632 -.00000007 00000-0 12107-3 0 9990
2 1328 41.1815 201.8547 0242115 3.9126 356.3456 13.38916373971271Epoch: 2026-02-09T21:56Z
TLE epoch observation values (Epoch: 2026-02-09T21:56:42.978Z)
Latitude
0.00001°
Longitude
92.67327°
Altitude
931.96 km
Speed
7.476 km/s
True Right ascension
13h 27m 25s
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
14:02:11
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,296.81 km
Perigee altitude
933.952 km
Semi-major axis
7,493.518 km
Eccentricity
0.02421
Inclination
41.1815°
RAAN
201.8547°
Arg. of periapsis
3.9126°
True anomaly
356.16326°
Mean anomaly
356.3456°
Eccentric anomaly
356.25499°
Mean motion
3.34591 °/min
Orbital period
107.59 mins
BSTAR
0.00012107
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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. |
|---|---|---|---|---|---|---|---|
| 7 mins | 2026-02-10 12:25:24.152Z | 171.957° S | 2026-02-10 12:28:24.152Z | 140.753° SSE | 16.988° | 2026-02-10 12:32:24.152Z | 100.551° ESE |
| 11 mins | 2026-02-10 14:16:24.152Z | 227.735° WSW | 2026-02-10 14:21:24.152Z | 151.35° SSE | 40.15° | 2026-02-10 14:27:24.152Z | 78.726° E |
| 12 mins | 2026-02-10 16:09:24.152Z | 265.627° W | 2026-02-10 16:15:24.152Z | 51.494° ENE | 44.327° | 2026-02-10 16:21:24.152Z | 82.136° E |
| 13 mins | 2026-02-10 18:03:24.152Z | 281.511° WNW | 2026-02-10 18:09:24.152Z | 116.938° SE | 44.523° | 2026-02-10 18:16:24.152Z | 105.632° ESE |
| 12 mins | 2026-02-10 19:57:24.152Z | 273.602° WNW | 2026-02-10 20:02:24.152Z | 213.153° SW | 35.148° | 2026-02-10 20:09:24.152Z | 143.192° SSE |
| 5 mins | 2026-02-10 21:53:24.152Z | 241.159° WSW | 2026-02-10 21:55:24.152Z | 224.891° SW | 13.487° | 2026-02-10 21:58:24.152Z | 201.626° SSW |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
Click to sort rows by RSO header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Type header in ascending order | Click to sort rows by Inclination Δ header in ascending order | Click to sort rows by RAAN Δ header in ascending order | Click to sort rows by Coplanar Angle header in ascending order | Click to sort rows by SMA Δ header in ascending order | Click to sort rows by Orbital period header in ascending order | Click to sort rows by <5km Md TCA header in descending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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