THOR AGENA D R/B, 2255

Orbit data source: Space-Track

THOR AGENA D R/B, 2255 is space debris in LEO originally from a launch on Fri, 24 Jun 1966 UTC launched from the Air Force Western Test Range (AFWTR). Debris objects in space refer to the collection of defunct objects orbiting the Earth. Examples of debris include non-operational satellites, rocket bodies, and fragments generated from explosions, collisions, or faulty payload assembly.

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https://www.satcat.com/sats-embedded/2255?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

2255, 1966-056B

Orbit

LEO

Country

Related business

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

LMSC

Mission

Spacecraft

Bus & Motor

AGENA D, Unknown motor

Mass

600 kg wet, 600 kg dry

Launch date (UTC)

1966-06-24 (60 years ago)

Launch vehicle

Unknown

Launch site

Air Force Western Test Range (AFWTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Unknown

Radar Cross Section

Large (>1 m²)

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Last TLE update: 8 hours ago

TLE from 8 hours ago

0 THOR AGENA D R/B
1 02255U 66056B   26124.54048314  .00000016  00000-0  12956-1 0  9992
2 02255  86.9791 182.9092 0047258 135.9441 224.5145  7.94756589736852

Epoch: 2026-05-04T12:58Z

TLE epoch observation values (Epoch: 2026-05-04T12:58:17.743Z)

Latitude

-0.00005°

Longitude

125.90706°

Altitude

4,266.46 km

Speed

6.11 km/s

True Right ascension

12h 11m 38s

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

04:37:44

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

4,276.597 km

Perigee altitude

4,176.366 km

Semi-major axis

10,604.619 km

Eccentricity

0.00473

Inclination

86.9791°

RAAN

182.9092°

Arg. of periapsis

135.9441°

True anomaly

224.13643°

Mean anomaly

224.5145°

Eccentric anomaly

224.32531°

Mean motion

1.98747 °/min

Orbital period

181.13 mins

BSTAR

0.012956

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Other satellites on launch #56 in the year 1966 (1966-06-24 UTC)

PAGEOS 1 DEB, 9781 (Decayed)

PAGEOS 1 DEB, 9465 (Decayed)

PAGEOS 1 DEB, 9468

PAGEOS 1 DEB, 2511

PAGEOS 1 DEB, 9739 (Decayed)

PAGEOS 1 DEB, 9456 (Decayed)

PAGEOS 1 DEB, 9764 (Decayed)

PAGEOS 1 DEB, 9761 (Decayed)

PAGEOS 1 DEB, 2256

PAGEOS 1 DEB, 9748 (Decayed)

PAGEOS 1 DEB, 9469 (Decayed)

PAGEOS 1 DEB, 9782 (Decayed)

PAGEOS 1 DEB, 9780 (Decayed)

PAGEOS 1 DEB, 9462 (Decayed)

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THOR AGENA D R/B 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.
27 mins	2026-05-05 01:15:13.391Z	97.447° ESE	2026-05-05 01:28:13.391Z	57.974° ENE	20.833°	2026-05-05 01:42:13.391Z	15.111° NNE
42 mins	2026-05-05 04:04:13.391Z	174.087° S	2026-05-05 04:24:13.391Z	130.75° SE	44.951°	2026-05-05 04:46:13.391Z	3.174° NNE
31 mins	2026-05-05 07:16:13.391Z	255.446° W	2026-05-05 07:30:13.391Z	300.213° NW	22.364°	2026-05-05 07:47:13.391Z	353.987° N
38 mins	2026-05-05 13:58:13.391Z	4.546° NNE	2026-05-05 14:17:13.391Z	74.224° E	34.366°	2026-05-05 14:36:13.391Z	140.838° SSE
39 mins	2026-05-05 17:00:13.391Z	352.299° N	2026-05-05 17:19:13.391Z	279.741° WNW	39.986°	2026-05-05 17:39:13.391Z	210.75° SW

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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 THOR AGENA D R/B, 2255 on other resources

View THOR AGENA D R/B, 2255 on Heavens-Above

View THOR AGENA D R/B, 2255 on Keep Track

View THOR AGENA D R/B, 2255 on Celestrak

View THOR AGENA D R/B, 2255 on Gunter's Space Page

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

THOR AGENA D R/B, 2255

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 8 hours ago

TLE from 8 hours ago

TLE epoch observation values (Epoch: 2026-05-04T12:58:17.743Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #56 in the year 1966 (1966-06-24 UTC)

THOR AGENA D R/B Visibility forecast

Co-orbital & Co-planar RSOs

Check out THOR AGENA D R/B, 2255 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 8 hours ago