DELTA 4 R/B, 39742
Orbit data source: Space-Track
DELTA 4 R/B, 39742 is space debris in MEO originally from a launch on Sat, 17 May 2014 UTC launched from the Air Force Eastern Test Range (AFETR). 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.
Focus sentinelFocus sentinel
Request partner network tasking
Focus sentinelFocus sentinel
Embed this page
Focus sentinelFocus sentinel
39742 intel report (Beta)
Focus sentinelFocus sentinel
Edit Public Description
Focus sentinelFocus sentinel
Create New Watchlist
Identifier
Orbit
Country
USRelated business
Manufacturer
ULA Decatur
Mission
Spacecraft
Bus & Motor
DCSS-4, RL10B-2
Mass
2,850 kg wet, 2,850 kg dry
Launch date (UTC)
Launch vehicle
Unknown
Launch site
Object type
Shape & HBR
Cyl + 1 Nozzle, 6.0 m
Radar Cross Section
43.982 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 14 hours ago
TLE from 14 hours ago
0 DELTA 4 R/B
1 39742U 14026B 26048.15022491 -.00000080 00000-0 00000+0 0 9990
2 39742 56.6784 347.3118 0012870 126.5400 233.5858 1.93898921 80749Epoch: 2026-02-17T03:36Z
TLE epoch observation values (Epoch: 2026-02-17T03:36:19.432Z)
Latitude
0.00003°
Longitude
146.08384°
Altitude
20,808.589 km
Speed
3.828 km/s
True Right ascension
23h 09m 11s
True Declination
0° 00' 00"
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
20:05:24
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
20,822.299 km
Perigee altitude
20,752.375 km
Semi-major axis
27,165.474 km
Eccentricity
0.00129
Inclination
56.6784°
RAAN
347.3118°
Arg. of periapsis
126.54°
True anomaly
233.46723°
Mean anomaly
233.5858°
Eccentric anomaly
233.5265°
Mean motion
0.48475 °/min
Orbital period
742.65 mins
BSTAR
0
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 #26 in the year 2014 (2014-05-17 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.DELTA 4 R/B 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. |
|---|---|---|---|---|---|---|---|
| 110 mins | 2026-02-17 17:15:05.774Z | 77.378° E | 2026-02-17 17:43:05.774Z | 64.521° ENE | 21.902° | 2026-02-17 19:05:05.774Z | 34.525° NE |
| 274 mins | 2026-02-18 06:45:05.774Z | 318.085° NNW | 2026-02-18 09:01:05.774Z | 275.11° WNW | 37.515° | 2026-02-18 11:19:05.774Z | 214.196° SW |
| 44 mins | 2026-02-18 16:31:05.774Z | 120.247° SE | 2026-02-18 17:15:05.774Z | 104.984° ESE | 21.728° | 2026-02-18 17:15:05.774Z | 104.984° ESE |
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 |
|---|