CALSPHERE 1, 900
Orbit data source: Space-Track
CALSPHERE 1, 900 is a payload satellite owned by NRL (US) in LEO that was launched on Tue, 06 Oct 1964 UTC via a THOR ABLESTAR 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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900 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
USRelated business
Manufacturer
NRL
Mission
Operational Defense Calibration
Bus & Motor
NRL 14", Unknown motor
Mass
1 kg wet, 1 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Sphere, 0.2 m
Radar Cross Section
0.102 m², Small (<0.1 m²)
Expand to show TLE details & historyLast TLE update: 9 hours ago
TLE from 9 hours ago
0 CALSPHERE 1
1 00900U 64063C 25258.25236525 .00000687 00000-0 69491-3 0 9993
2 00900 90.2136 65.4178 0026748 48.0613 125.3479 13.76188461 33600Epoch: 2025-09-15T06:03Z
TLE epoch observation values (Epoch: 2025-09-15T06:03:24.357Z)
Latitude
6.26276°
Longitude
160.12995°
Altitude
991.254 km
Speed
7.351 km/s
True Right ascension
16h 21m 45s
True Declination
6° 13' 36"
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
07:35:30
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
994.115 km
Perigee altitude
954.782 km
Semi-major axis
7,352.586 km
Eccentricity
0.00267
Inclination
90.2136°
RAAN
65.4178°
Arg. of periapsis
48.0613°
True anomaly
125.59742°
Mean anomaly
125.3479°
Eccentric anomaly
125.47271°
Mean motion
3.44257 °/min
Orbital period
104.57 mins
BSTAR
0.00069491
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Other satellites on launch #63 in the year 1964 (1964-10-06 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.CALSPHERE 1 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. |
|---|---|---|---|---|---|---|---|
| 12 mins | 2025-09-15 23:14:41.031Z | 9.833° NNE | 2025-09-15 23:20:41.031Z | 90.782° ESE | 41.185° | 2025-09-15 23:26:41.031Z | 170.007° S |
| 7 mins | 2025-09-16 01:01:41.031Z | 319.315° NNW | 2025-09-16 01:04:41.031Z | 284.869° WNW | 18.433° | 2025-09-16 01:08:41.031Z | 243.924° WSW |
| 9 mins | 2025-09-16 11:00:41.031Z | 145.817° SSE | 2025-09-16 11:04:41.031Z | 81.689° E | 36.339° | 2025-09-16 11:09:41.031Z | 12.049° NNE |
| 8 mins | 2025-09-16 12:45:41.031Z | 233.701° WSW | 2025-09-16 12:49:41.031Z | 282.85° WNW | 21.912° | 2025-09-16 12:53:41.031Z | 327.353° NNW |
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 |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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