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.
Focus sentinelFocus sentinel
Request partner network tasking
Focus sentinelFocus sentinel
Embed this page
Focus sentinelFocus sentinel
1328 intel report (Beta)
Focus sentinelFocus sentinel
Create New Watchlist
Focus sentinelFocus sentinel
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: 7 hours ago
TLE from 7 hours ago
0 EXPLORER 27
1 1328U 65032A 25346.15470519 .00000040 00000-0 19738-3 0 9997
2 1328 41.1827 97.5476 0242144 53.2400 309.0324 13.38910722963261Epoch: 2025-12-12T03:42Z
TLE epoch observation values (Epoch: 2025-12-12T03:42:46.528Z)
Latitude
-0.00002°
Longitude
-39.24668°
Altitude
1,001.434 km
Speed
7.407 km/s
True Right ascension
06h 30m 11s
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
09:15:41
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,296.853 km
Perigee altitude
933.95 km
Semi-major axis
7,493.539 km
Eccentricity
0.02421
Inclination
41.1827°
RAAN
97.5476°
Arg. of periapsis
53.24°
True anomaly
306.83568°
Mean anomaly
309.0324°
Eccentric anomaly
307.93821°
Mean motion
3.3459 °/min
Orbital period
107.59 mins
BSTAR
0.00019738
Loading maneuver chart data...
Computing Atmospheric mass density...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Other satellites on launch #32 in the year 1965 (1965-04-29 UTC)
Did you know?
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
Loading observer location...
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 | 2025-12-12 11:03:35.280Z | 223.396° SW | 2025-12-12 11:09:35.280Z | 142.825° SSE | 36.33° | 2025-12-12 11:14:35.280Z | 81.701° E |
| 11 mins | 2025-12-12 12:57:35.280Z | 261.198° W | 2025-12-12 13:02:35.280Z | 333.738° NNW | 44.932° | 2025-12-12 13:08:35.280Z | 80.04° E |
| 11 mins | 2025-12-12 14:51:35.280Z | 280.79° WNW | 2025-12-12 14:56:35.280Z | 72.237° E | 44.87° | 2025-12-12 15:02:35.280Z | 100.453° ESE |
| 11 mins | 2025-12-12 16:45:35.280Z | 272.809° WNW | 2025-12-12 16:49:35.280Z | 215.43° SW | 36.731° | 2025-12-12 16:56:35.280Z | 136.152° SSE |
| 5 mins | 2025-12-12 18:40:35.280Z | 242.156° WSW | 2025-12-12 18:42:35.280Z | 223.319° SW | 14.753° | 2025-12-12 18:45:35.280Z | 196.54° SSW |
| 9 mins | 2025-12-13 10:20:35.280Z | 207.66° SW | 2025-12-13 10:24:35.280Z | 154.52° SSE | 31.603° | 2025-12-13 10:29:35.280Z | 86.616° E |
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 |
|---|
CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
Authenticating...
Click to sort rows by Secondary header in ascending order | Click to sort rows by Secondary name header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Owner header in ascending order | Click to sort rows by Obj. Type header in ascending order | Click to sort rows by Miss dist. header in ascending order | Click to sort rows by Rel. speed header in ascending order | Click to sort rows by Apr. angle header in ascending order | Click to sort rows by TCA header in descending order |
|---|