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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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https://www.satcat.com/sats-embedded/1738?theme=dark&initialShowStats=false

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Identifier

1738, 1965-093A

Orbit

LEO

Country

Related business

United States Navy (US)

Manufacturer

NRL

Mission

Spacecraft

Bus & Motor

NRL 24", Unknown motor

Mass

57 kg wet, 57 kg dry

Launch date (UTC)

1965-11-19 (61 years ago)

Launch vehicle

SCOUT X-4

Launch site

Wallops Island (WLPIS)

Object type

Payload

Rocket body

Debris

Shape & HBR

Unknown

Radar Cross Section

Medium (>0.1 m² and <1 m²)

Expand to show TLE details & history
Last TLE update: 6 hours ago

TLE from 6 hours ago

0 EXPLORER 30
1 01738U 65093A   26198.57909652 -.00000012  00000-0  40246-4 0  9995
2 01738  59.7064 141.4979 0137297  64.9417 296.5801 14.41845649160775

Epoch: 2026-07-17T13:53Z

TLE epoch observation values (Epoch: 2026-07-17T13:53:53.939Z)

Latitude

-0°

Longitude

-2.38102°

Altitude

711.197 km

Speed

7.523 km/s

True Right ascension

09h 25m 59s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

Unknown

Longitude

Unknown

Altitude

Unknown

Speed

Unknown

Apparent Right ascension

Unknown

Apparent Declination

Unknown

Sunlit

N/A

Visualization observer readout

Local Sidereal Time

08:34:38

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

849.571 km

Perigee altitude

653.79 km

Semi-major axis

7,129.817 km

Eccentricity

0.01373

Inclination

59.7064°

RAAN

141.4979°

Arg. of periapsis

64.9417°

True anomaly

295.16234°

Mean anomaly

296.5801°

Eccentric anomaly

295.87229°

Mean motion

3.60517 °/min

Orbital period

99.86 mins

BSTAR

0.000040246

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Other satellites on launch #93 in the year 1965 (1965-11-19 UTC)

SCOUT X-4 R/B, 1739

SCOUT X-4 DEB, 2088

SCOUT X-4 DEB, 2013 (Decayed)

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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.

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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	2026-07-17 22:21:30.862Z	211.609° SW	2026-07-17 22:25:30.862Z	170.523° S	43.287°	2026-07-17 22:29:30.862Z	43.774° NE
5 mins	2026-07-18 00:07:30.862Z	292.443° WNW	2026-07-18 00:09:30.862Z	322.921° NNW	18.058°	2026-07-18 00:12:30.862Z	7.119° NNE
6 mins	2026-07-18 05:23:30.862Z	357.717° N	2026-07-18 05:25:30.862Z	33.637° NE	25.024°	2026-07-18 05:29:30.862Z	94.796° ESE
7 mins	2026-07-18 07:06:30.862Z	299.189° NW	2026-07-18 07:09:30.862Z	227.924° WSW	36.335°	2026-07-18 07:13:30.862Z	165.781° S

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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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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

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Check out EXPLORER 30, 1738 on other resources

View EXPLORER 30, 1738 on NASA - NSSDCA Website

View EXPLORER 30, 1738 on Heavens-Above

View EXPLORER 30, 1738 on Keep Track

View EXPLORER 30, 1738 on Celestrak

View EXPLORER 30, 1738 on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.

EXPLORER 30, 1738

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 6 hours ago

TLE from 6 hours ago

TLE epoch observation values (Epoch: 2026-07-17T13:53:53.939Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #93 in the year 1965 (1965-11-19 UTC)

EXPLORER 30 Visibility forecast

Co-orbital & Co-planar RSOs

Check out EXPLORER 30, 1738 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 6 hours ago