DMSP 5D-2 F8 (USA 26), 18123
Orbit data source: Space-Track
DMSP 5D-2 F8 (USA 26), 18123 is a payload satellite owned by USAF SD (US) in SSO that was launched on Sat, 20 Jun 1987 UTC via an ATLAS E 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.
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18123 intel report (Beta)
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Identifier
Orbit
Country
USRelated business
Manufacturer
GE/East Windsor
Mission
Non-operational Defense Weather
Bus & Motor
BLOCK 5D, STAR 37S
Mass
1,487 kg wet, 773 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Cyl + 1 Pan, 3.5 m
Radar Cross Section
9.012 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 11 hours ago
TLE from 11 hours ago
0 DMSP 5D-2 F8 (USA 26)
1 18123U 87053A 26171.44233487 .00000017 00000-0 28712-4 0 9992
2 18123 98.7333 357.4519 0013049 147.4679 212.7304 14.19554461 17309Epoch: 2026-06-20T10:36Z
TLE epoch observation values (Epoch: 2026-06-20T10:36:57.732Z)
Latitude
-0.00002°
Longitude
-70.44555°
Altitude
837.687 km
Speed
7.43 km/s
True Right ascension
23h 49m 48s
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
08:33:32
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
833.418 km
Perigee altitude
814.622 km
Semi-major axis
7,202.157 km
Eccentricity
0.0013
Inclination
98.7333°
RAAN
357.4519°
Arg. of periapsis
147.4679°
True anomaly
212.64966°
Mean anomaly
212.7304°
Eccentric anomaly
212.69002°
Mean motion
3.55099 °/min
Orbital period
101.38 mins
BSTAR
0.000028712
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Other satellites on launch #53 in the year 1987 (1987-06-20 UTC)
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You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.DMSP 5D-2 F8 (USA 26) 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. |
|---|---|---|---|---|---|---|---|
| 9 mins | 2026-06-21 00:44:35.018Z | 33.082° NE | 2026-06-21 00:48:35.018Z | 97.548° ESE | 33.48° | 2026-06-21 00:53:35.018Z | 168.76° S |
| 7 mins | 2026-06-21 02:25:35.018Z | 337.852° N | 2026-06-21 02:28:35.018Z | 294.707° NW | 22.708° | 2026-06-21 02:32:35.018Z | 243.375° WSW |
| 8 mins | 2026-06-21 12:07:35.018Z | 150° SSE | 2026-06-21 12:10:35.018Z | 103.247° ESE | 41.763° | 2026-06-21 12:15:35.018Z | 353.576° N |
| 4 mins | 2026-06-21 13:50:35.018Z | 255.107° W | 2026-06-21 13:51:35.018Z | 267.625° W | 14.418° | 2026-06-21 13:54:35.018Z | 302.21° NW |
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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