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

CYL, 3.1 m

Radar Cross Section

Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 14 hours ago

TLE from 14 hours ago

0 THOR AGENA D R/B
1 02255U 66056B   26235.80176660 -.00000001  00000-0 -27817-2 0  9999
2 02255  86.9831 173.0936 0047476  45.1312 315.3337  7.94756039745690

Epoch: 2026-08-23T19:14Z

TLE epoch observation values (Epoch: 2026-08-23T19:14:32.634Z)

Latitude

-0°

Longitude

-87.63498°

Altitude

4,194.903 km

Speed

6.151 km/s

True Right ascension

11h 32m 22s

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

00:23:35

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

4,276.833 km

Perigee altitude

4,176.14 km

Semi-major axis

10,604.623 km

Eccentricity

0.00475

Inclination

86.9831°

RAAN

173.0936°

Arg. of periapsis

45.1312°

True anomaly

314.94964°

Mean anomaly

315.3337°

Eccentric anomaly

315.14183°

Mean motion

1.98747 °/min

Orbital period

181.13 mins

BSTAR

-0.0027817

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

PAGEOS 1 DEB, 2256

PAGEOS 1 DEB, 9465 (Decayed)

PAGEOS 1 DEB, 9468

PAGEOS 1 DEB, 8076 (Decayed)

PAGEOS 1 DEB, 8079 (Decayed)

PAGEOS 1 DEB, 9741 (Decayed)

PAGEOS 1 DEB, 9748 (Decayed)

PAGEOS 1 DEB, 9777 (Decayed)

PAGEOS 1 DEB, 9763 (Decayed)

PAGEOS 1 DEB, 9749 (Decayed)

PAGEOS 1 DEB, 9455 (Decayed)

PAGEOS 1 DEB, 9457 (Decayed)

PAGEOS 1 DEB, 2511

PAGEOS 1 DEB, 9757 (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.
25 mins	2026-08-24 11:12:23.405Z	343.38° N	2026-08-24 11:24:23.405Z	307.418° NW	18.663°	2026-08-24 11:37:23.405Z	268.365° W
15 mins	2026-08-24 16:44:23.405Z	67.336° ENE	2026-08-24 16:51:23.405Z	46.172° ENE	13.771°	2026-08-24 16:59:23.405Z	22.55° NE
40 mins	2026-08-24 19:25:23.405Z	158.25° S	2026-08-24 19:44:23.405Z	86.207° E	42.903°	2026-08-24 20:05:23.405Z	5.162° NNE
37 mins	2026-08-24 22:30:23.405Z	232.062° WSW	2026-08-24 22:48:23.405Z	293.855° NW	29.661°	2026-08-24 23:07:23.405Z	357.027° N
35 mins	2026-08-25 05:17:23.405Z	6.015° NNE	2026-08-25 05:35:23.405Z	66.133° ENE	27.242°	2026-08-25 05:52:23.405Z	121.57° SE
41 mins	2026-08-25 08:19:23.405Z	355.278° N	2026-08-25 08:39:23.405Z	272.902° WNW	43.998°	2026-08-25 09:00:23.405Z	195.754° 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 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: 14 hours ago

TLE from 14 hours ago

TLE epoch observation values (Epoch: 2026-08-23T19:14:32.634Z)

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: 14 hours ago