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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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: 20 hours ago

TLE from 20 hours ago

0 THOR AGENA D R/B
1 02255U 66056B   26082.62862552  .00000022  00000-0  19003-1 0  9999
2 02255  86.9838 186.6032 0047221 170.0331 190.1422  7.94756582733527

Epoch: 2026-03-23T15:05Z

TLE epoch observation values (Epoch: 2026-03-23T15:05:13.244Z)

Latitude

0.00001°

Longitude

139.18012°

Altitude

4,279.913 km

Speed

6.102 km/s

True Right ascension

12h 26m 24s

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

16:28:38

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

4,276.558 km

Perigee altitude

4,176.405 km

Semi-major axis

10,604.619 km

Eccentricity

0.00472

Inclination

86.9838°

RAAN

186.6032°

Arg. of periapsis

170.0331°

True anomaly

190.04747°

Mean anomaly

190.1422°

Eccentric anomaly

190.09478°

Mean motion

1.98747 °/min

Orbital period

181.13 mins

BSTAR

0.019003

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

PAGEOS 1 DEB, 9465 (Decayed)

PAGEOS 1 DEB, 9749 (Decayed)

PAGEOS 1 DEB, 9752 (Decayed)

PAGEOS 1 DEB, 9751 (Decayed)

PAGEOS 1 DEB, 9783 (Decayed)

PAGEOS 1 DEB, 9759 (Decayed)

PAGEOS 1 DEB, 9741 (Decayed)

PAGEOS 1 DEB, 9742 (Decayed)

PAGEOS 1 DEB, 9768 (Decayed)

PAGEOS 1 DEB, 9753 (Decayed)

PAGEOS 1, 2253 (Decayed)

PAGEOS 1 DEB, 9782 (Decayed)

PAGEOS 1 DEB, 9779 (Decayed)

PAGEOS 1 DEB, 9467 (Decayed)

PAGEOS 1 DEB, 9463 (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.
34 mins	2026-03-24 16:04:19.096Z	5.123° NNE	2026-03-24 16:21:19.096Z	59.51° ENE	24.885°	2026-03-24 16:38:19.096Z	115.288° SE
41 mins	2026-03-24 19:06:19.096Z	356.128° N	2026-03-24 19:26:19.096Z	289.388° WNW	44.58°	2026-03-24 19:47:19.096Z	191.317° SSW
22 mins	2026-03-24 22:11:19.096Z	339.776° N	2026-03-24 22:22:19.096Z	305.88° NW	18.143°	2026-03-24 22:33:19.096Z	272.242° WNW
17 mins	2026-03-25 03:40:19.096Z	71.116° E	2026-03-25 03:48:19.096Z	47.421° ENE	14.407°	2026-03-25 03:57:19.096Z	21.151° NNE
42 mins	2026-03-25 06:21:19.096Z	159.46° S	2026-03-25 06:42:19.096Z	76.714° E	43.12°	2026-03-25 07:03:19.096Z	4.883° NNE
37 mins	2026-03-25 09:27:19.096Z	232.495° WSW	2026-03-25 09:45:19.096Z	292.368° WNW	29.544°	2026-03-25 10:04:19.096Z	355.844° N

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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: 20 hours ago

TLE from 20 hours ago

TLE epoch observation values (Epoch: 2026-03-23T15:05:13.244Z)

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: 20 hours ago