EXPLORER 30, 1738
Orbit data source: Space-Track
EXPLORER 30, 1738 is a payload satellite owned by NRL (US) in LEO that was launched on Fri, 19 Nov 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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1738 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
USRelated business
Manufacturer
NRL
Mission
Civil Astronomy
Bus & Motor
NRL 24", Unknown motor
Mass
57 kg wet, 57 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Sphere, 0.3 m
Radar Cross Section
0.292 m², Medium (>0.1 m² and < 1m²)
Expand to show TLE details & historyLast TLE update: 12 hours ago
TLE from 12 hours ago
0 EXPLORER 30
1 01738U 65093A 25260.94724995 .00000178 00000-0 92583-4 0 9993
2 01738 59.7060 90.9624 0135181 143.0706 217.9734 14.41632844117131Epoch: 2025-09-17T22:44Z
TLE epoch observation values (Epoch: 2025-09-17T22:44:02.395Z)
Latitude
-0.00001°
Longitude
112.83652°
Altitude
831.105 km
Speed
7.398 km/s
True Right ascension
06h 03m 50s
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
03:57:08
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
848.773 km
Perigee altitude
655.991 km
Semi-major axis
7,130.519 km
Eccentricity
0.01352
Inclination
59.706°
RAAN
90.9624°
Arg. of periapsis
143.0706°
True anomaly
217.03285°
Mean anomaly
217.9734°
Eccentric anomaly
217.50188°
Mean motion
3.60464 °/min
Orbital period
99.87 mins
BSTAR
0.000092583
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Other satellites on launch #93 in the year 1965 (1965-11-19 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 30 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. |
|---|---|---|---|---|---|---|---|
| 8 mins | 2025-09-18 13:50:07.097Z | 172.917° S | 2025-09-18 13:54:07.097Z | 122.306° SE | 24.251° | 2025-09-18 13:58:07.097Z | 66.35° ENE |
| 8 mins | 2025-09-18 15:34:07.097Z | 247.876° W | 2025-09-18 15:37:07.097Z | 300.383° NW | 36.499° | 2025-09-18 15:42:07.097Z | 28.708° NE |
| 7 mins | 2025-09-18 22:35:07.097Z | 335.647° NNW | 2025-09-18 22:38:07.097Z | 64.471° ENE | 39.783° | 2025-09-18 22:42:07.097Z | 125.869° SE |
| 4 mins | 2025-09-19 00:19:07.097Z | 268.562° W | 2025-09-19 00:21:07.097Z | 237.463° WSW | 16.647° | 2025-09-19 00:23:07.097Z | 209.304° SW |
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 ascending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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