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CALSPHERE 4(A), 1520

Orbit data source: Space-Track

CALSPHERE 4(A), 1520 is a payload satellite owned by NRL (US) in LEO that was launched on Fri, 13 Aug 1965 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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Identifier
1520, 1965-065H
Orbit
LEO
Country
Flag of USUS
Related business
Manufacturer
NRL
Mission
Operational spacecraft
Bus & Motor
NRL 14", Unknown motor
Mass
4 kg wet, 4 kg dry
Launch date (UTC)
1965-08-13 (60 years ago)
Launch vehicle
THOR ABLESTAR
Launch site
Air Force Western Test Range (AFWTR)
Object type
Payload
Rocket body
Debris
Shape & HBR
Unknown
Radar Cross Section
Small (<0.1 m²)

Expand to show TLE details & history
Last TLE update: 7 hours ago

TLE from 7 hours ago
0 CALSPHERE 4(A)
1 01520U 65065H   26030.21607005  .00000113  00000-0  19726-3 0  9995
2 01520  89.9100 123.8206 0071469 132.4757 260.9687 13.36251814944284
Epoch: 2026-01-30T05:11Z
TLE epoch observation values (Epoch: 2026-01-30T05:11:08.452Z)
Latitude
32.69376°
Longitude
-83.36475°
Altitude
1,136.332 km
Speed
7.283 km/s
True Right ascension
08h 15m 30s
True Declination
32° 32' 44"
Sunlit
Object was in full shadow at epoch
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
N/A
Visualization observer readout
Local Sidereal Time
13:52:09
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,173.935 km
Perigee altitude
1,066.753 km
Semi-major axis
7,498.481 km
Eccentricity
0.00715
Inclination
89.91°
RAAN
123.8206°
Arg. of periapsis
132.4757°
True anomaly
260.16104°
Mean anomaly
260.9687°
Eccentric anomaly
260.56475°
Mean motion
3.34259 °/min
Orbital period
107.7 mins
BSTAR
0.00019726
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