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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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https://www.satcat.com/sats-embedded/1328?theme=dark&initialShowStats=false

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Identifier

1328, 1965-032A

Orbit

LEO

Country

Related business

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

APL

Mission

Spacecraft

Bus & Motor

TRANSIT 5, Unknown motor

Mass

55 kg wet, 55 kg dry

Launch date (UTC)

1965-04-29 (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

Large (>1 m²)

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Last TLE update: 5 hours ago

TLE from 5 hours ago

0 EXPLORER 27
1  1328U 65032A   26121.78824795 -.00000051  00000-0  55953-4 0  9990
2  1328  41.1817 215.8121 0240899  64.5659 297.9817 13.38925522982119

Epoch: 2026-05-01T18:55Z

TLE epoch observation values (Epoch: 2026-05-01T18:55:04.622Z)

Latitude

0.00001°

Longitude

72.32737°

Altitude

1,031.677 km

Speed

7.377 km/s

True Right ascension

14h 23m 14s

True Declination

0° 00' 00"

Sunlit

Object was in full shadow 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

07:35:22

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,295.864 km

Perigee altitude

934.83 km

Semi-major axis

7,493.484 km

Eccentricity

0.02409

Inclination

41.1817°

RAAN

215.8121°

Arg. of periapsis

64.5659°

True anomaly

295.50976°

Mean anomaly

297.9817°

Eccentric anomaly

296.74916°

Mean motion

3.34594 °/min

Orbital period

107.59 mins

BSTAR

0.000055953

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Other satellites on launch #32 in the year 1965 (1965-04-29 UTC)

SCOUT X-4 DEB, 2011

SCOUT X-4 R/B, 1358

SCOUT X-4 DEB, 1995 (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 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.
10 mins	2026-05-02 09:26:10.146Z	215.536° SW	2026-05-02 09:31:10.146Z	143.298° SSE	34.361°	2026-05-02 09:36:10.146Z	82.794° E
11 mins	2026-05-02 11:19:10.146Z	258.192° W	2026-05-02 11:24:10.146Z	341.814° N	44.995°	2026-05-02 11:30:10.146Z	79.216° E
11 mins	2026-05-02 13:13:10.146Z	280.104° WNW	2026-05-02 13:18:10.146Z	62.291° ENE	44.677°	2026-05-02 13:24:10.146Z	97.785° ESE
10 mins	2026-05-02 15:07:10.146Z	274.149° WNW	2026-05-02 15:11:10.146Z	212.691° SW	38.212°	2026-05-02 15:17:10.146Z	134.426° SE
6 mins	2026-05-02 17:02:10.146Z	241.835° WSW	2026-05-02 17:04:10.146Z	221.434° SW	16.097°	2026-05-02 17:08:10.146Z	185.43° SSW

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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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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings

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Check out EXPLORER 27, 1328 on other resources

View EXPLORER 27, 1328 on NASA - NSSDCA Website

View EXPLORER 27, 1328 on Heavens-Above

View EXPLORER 27, 1328 on Keep Track

View EXPLORER 27, 1328 on Celestrak

View EXPLORER 27, 1328 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 27, 1328

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 5 hours ago

TLE from 5 hours ago

TLE epoch observation values (Epoch: 2026-05-01T18:55:04.622Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #32 in the year 1965 (1965-04-29 UTC)

EXPLORER 27 Visibility forecast

Co-orbital & Co-planar RSOs

Check out EXPLORER 27, 1328 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 5 hours ago