COSMOS 2251 DEB, 40239
Orbit data source: Space-Track
COSMOS 2251 DEB, 40239 is space debris in LEO originally from a launch on Wed, 16 Jun 1993 UTC launched from the Plesetsk Missile And Space Complex (PKMTR). The debris from Iridium 33, an American commercial communications satellite, has been tracked extensively since its accidental collision with the defunct Russian satellite Cosmos 2251 in 2009. This event, occurring at high speed in low Earth orbit (LEO), generated thousands of pieces of space debris, significantly increasing the risk of further collisions. The Iridium 33 debris cloud has impacted space traffic management and orbital debris mitigation strategies, making it a subject of ongoing study in space situational awareness.
Focus sentinelFocus sentinel
Request partner network tasking
Focus sentinelFocus sentinel
Embed this page
Focus sentinelFocus sentinel
40239 intel report (Beta)
Focus sentinelFocus sentinel
Edit Public Description
Focus sentinelFocus sentinel
Edit Sat Name
Focus sentinelFocus sentinel
Create New Watchlist
Identifier
Orbit
Country
CISRelated business
Manufacturer
Unknown
Mission
Spacecraft
Bus & Motor
Unknown
Mass
Unknown
Launch date (UTC)
Launch vehicle
Unknown
Launch site
Object type
Shape & HBR
Unknown shape, 0.1 m
Radar Cross Section
Small (<0.1 m²)
Expand to show TLE details & historyLast TLE update: 1 day ago
TLE from 1 day ago
0 COSMOS 2251 DEB
1 40239U 93036BVU 26252.98707269 .00000835 00000-0 16142-3 0 9997
2 40239 74.0282 115.9398 0085144 160.2234 267.9449 14.62793324635768Epoch: 2026-09-09T23:41Z
TLE epoch observation values (Epoch: 2026-09-09T23:41:23.080Z)
Latitude
62.50759°
Longitude
164.72587°
Altitude
697.209 km
Speed
7.512 km/s
True Right ascension
09h 56m 24s
True Declination
62° 21' 55"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
02:23:16
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
741.875 km
Perigee altitude
621.653 km
Semi-major axis
7,059.901 km
Eccentricity
0.00851
Inclination
74.0282°
RAAN
115.9398°
Arg. of periapsis
160.2234°
True anomaly
266.97027°
Mean anomaly
267.9449°
Eccentric anomaly
267.45754°
Mean motion
3.65886 °/min
Orbital period
98.39 mins
BSTAR
0.00016142
Loading maneuver chart data...
Computing Atmospheric mass density...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Other satellites on launch #36 in the year 1993 (1993-06-16 UTC)
Did you know?
You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.COSMOS 2251 DEB Visibility forecast
Loading observer location...
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. |
|---|---|---|---|---|---|---|---|
| 6 mins | 2026-09-11 14:53:59.345Z | 140.537° SSE | 2026-09-11 14:56:59.345Z | 100.923° ESE | 19.886° | 2026-09-11 14:59:59.345Z | 58.345° ENE |
| 7 mins | 2026-09-11 16:33:59.345Z | 231.106° WSW | 2026-09-11 16:36:59.345Z | 289.858° WNW | 42.612° | 2026-09-11 16:40:59.345Z | 1.667° NNE |
| 5 mins | 2026-09-12 01:11:59.345Z | 24.675° NE | 2026-09-12 01:13:59.345Z | 62.5° ENE | 24.83° | 2026-09-12 01:16:59.345Z | 112.202° ESE |
| 5 mins | 2026-09-12 02:51:59.345Z | 302.71° NW | 2026-09-12 02:53:59.345Z | 263.757° W | 28.32° | 2026-09-12 02:56:59.345Z | 208.316° SW |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
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
Authenticating...
Click to sort rows by Secondary header in ascending order | Click to sort rows by Secondary name header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Owner header in ascending order | Click to sort rows by Obj. Type header in ascending order | Click to sort rows by Miss dist. header in ascending order | Click to sort rows by Rel. speed header in ascending order | Click to sort rows by Apr. angle header in ascending order | Click to sort rows by TCA header in descending order |
|---|