OPS 4988 (GREB 6), 1271
Orbit data source: Space-Track
OPS 4988 (GREB 6), 1271 is an American payload satellite in LEO that was launched on Tue, 09 Mar 1965 UTC via a THOR SLV-2 AGENA D launch vehicle from the Air Force Western Test Range (AFWTR). Payload-class satellites include a variety of spacecraft equipped with specific instruments for various scientific and technological missions. These include communications satellites like Starlink; space stations such as the ISS; scientific satellites like the Hubble; Earth observation satellites from companies like Planet Labs, Umbra, and HawkEye 360; GPS; miniature CubeSats for education and research; and military/defense satellites.
Focus sentinelFocus sentinel
Embed this page
Focus sentinelFocus sentinel
1271 intel report (Beta)
Focus sentinelFocus sentinel
Create New Watchlist
Focus sentinelFocus sentinel
Edit Public Description
Identifier
Orbit
Country
USRelated business
Manufacturer
NRL
Mission
Defense Sigint
Bus & Motor
NRL 24", Unknown motor
Mass
48 kg wet, 48 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Sphere, 0.3 m
Radar Cross Section
0.196 m², Medium (>0.1 m² and < 1m²)
Expand to show TLE details & historyLast TLE update: 10 hours ago
TLE from 10 hours ago
0 OPS 4988 (GREB 6)
1 01271U 65016A 25258.61254439 .00000015 00000-0 48636-4 0 9992
2 01271 70.0816 23.4701 0018248 67.5397 18.0105 13.96592280 80471Epoch: 2025-09-15T14:42Z
TLE epoch observation values (Epoch: 2025-09-15T14:42:03.835Z)
Latitude
69.72088°
Longitude
-114.56045°
Altitude
904.433 km
Speed
7.413 km/s
True Right ascension
06h 43m 04s
True Declination
69° 36' 40"
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
17:06:09
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
916.942 km
Perigee altitude
890.366 km
Semi-major axis
7,281.791 km
Eccentricity
0.00182
Inclination
70.0816°
RAAN
23.4701°
Arg. of periapsis
67.5397°
True anomaly
18.07529°
Mean anomaly
18.0105°
Eccentric anomaly
18.04288°
Mean motion
3.4929 °/min
Orbital period
103.07 mins
BSTAR
0.000048636
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 #16 in the year 1965 (1965-03-09 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.OPS 4988 (GREB 6) 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. |
|---|---|---|---|---|---|---|---|
| 10 mins | 2025-09-16 09:18:46.853Z | 179.98° S | 2025-09-16 09:23:46.853Z | 107.817° ESE | 37.575° | 2025-09-16 09:28:46.853Z | 36.722° NE |
| 7 mins | 2025-09-16 11:06:46.853Z | 267.387° W | 2025-09-16 11:09:46.853Z | 309.743° NW | 23.461° | 2025-09-16 11:13:46.853Z | 357.846° N |
| 8 mins | 2025-09-16 18:21:46.853Z | 6.982° NNE | 2025-09-16 18:24:46.853Z | 48.373° ENE | 26.452° | 2025-09-16 18:29:46.853Z | 112.687° SE |
| 9 mins | 2025-09-16 20:06:46.853Z | 315.199° NNW | 2025-09-16 20:10:46.853Z | 254.193° W | 33.916° | 2025-09-16 20:15:46.853Z | 186.439° SSW |
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 ascending 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 ascending order |
|---|