Showing default

CALSPHERE 4(A), 1520

Orbit data source: Space-Track

CALSPHERE 4(A), 1520 is a payload satellite 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.

Loading next visibility...
Identifier
1520, 1965-065H
Orbit
LEO
Last TLE update
13 hours ago
Origin
Manufacturer
NRL
Mission
Operational Defense Calibration
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
Sphere, 0.4 m
Radar Cross Section
0.126 m², Small (<0.1 m²)

Expand to show TLE details & history

TLE from 13 hours ago
0 CALSPHERE 4(A)
1 01520U 65065H   25138.90164090  .00000123  00000-0  21781-3 0  9996
2 01520  89.9203 125.9289 0070980 134.9512 288.6903 13.36194284910058
Epoch: 2025-05-18T21:38Z
TLE epoch observation values (Epoch: 2025-05-18T21:38:21.773Z)
Latitude
62.95385°
Longitude
-75.32847°
Altitude
1,117.66 km
Speed
7.308 km/s
True Right ascension
08h 24m 20s
True Declination
62° 49' 16"
Sunlit
Object was in daylight at epoch
Visualization orbit readout
Latitude
-54.50673°
Longitude
104.62303°
Altitude
1,154.422 km
Speed
7.27 km/s
Apparent Right ascension
04h 46m 07s
Apparent Declination
-85° 26' 03"
Sunlit
Object is in daylight
Visualization observer readout
Local Sidereal Time
19:53:04
Azimuth
175.457° S
Elevation
-42.959°
Doppler factor
1
Orbital elements
Apogee altitude
1,173.785 km
Perigee altitude
1,067.334 km
Semi-major axis
7,498.696 km
Eccentricity
0.0071
Inclination
89.9203°
RAAN
125.9289°
Arg. of periapsis
134.9512°
True anomaly
Unknown
Mean anomaly
288.6903°
Eccentric anomaly
Unknown
Mean motion
3.34245 °/min
Orbital period
107.71 mins
BSTAR
0.00021781
Loading maneuver chart data...
Loading SW <> Apogee altitude chart data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...

CALSPHERE 4(A) Visibility forecast

Observer location: undefined°, undefined°

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.
11 mins2025-05-19 12:18:03.583Z344.283° N2025-05-19 12:23:03.583Z290.947° WNW31.579°2025-05-19 12:29:03.583Z217.602° SW
10 mins2025-05-19 22:37:03.583Z135.287° SSE2025-05-19 22:41:03.583Z87.53° E31.561°2025-05-19 22:47:03.583Z16.336° NNE
11 mins2025-05-20 00:24:03.583Z217.352° SW2025-05-20 00:29:03.583Z275.939° WNW30.02°2025-05-20 00:35:03.583Z339.721° N
6 mins2025-05-20 09:55:03.583Z52.715° ENE2025-05-20 09:57:03.583Z73.578° E16.788°2025-05-20 10:01:03.583Z113.602° SE
|