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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.

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<iframe src="https://www.satcat.com/sats-embedded/1520?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

Iframe URL

https://www.satcat.com/sats-embedded/1520?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

1520, 1965-065H

Orbit

LEO

Last TLE update

13 hours ago

Origin

United States Navy (US)

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

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

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Other satellites on launch #65 in the year 1965 (1965-08-13 UTC)

THOR ABLESTAR DEB, 1504

THOR ABLESTAR R/B, 1508

DODECAPOLE 2, 1510

THOR ABLESTAR DEB, 1511

TEMPSAT 1, 1512

OPS 8464 (TRANSIT 5B-7), 1514

NAVSPASUR ROD 1, 1515

PORCUPINE 2, 1577

THOR ABLESTAR DEB, 1521

THOR ABLESTAR DEB, 1522

OPS 8464 DEB *, 2335 (Decayed)

TRANSIT 5B-7 DEB, 3809 (Decayed)

THOR ABLESTAR DEB, 3810

THOR ABLESTAR DEB, 5265

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 mins	2025-05-19 12:18:03.583Z	344.283° N	2025-05-19 12:23:03.583Z	290.947° WNW	31.579°	2025-05-19 12:29:03.583Z	217.602° SW
10 mins	2025-05-19 22:37:03.583Z	135.287° SSE	2025-05-19 22:41:03.583Z	87.53° E	31.561°	2025-05-19 22:47:03.583Z	16.336° NNE
11 mins	2025-05-20 00:24:03.583Z	217.352° SW	2025-05-20 00:29:03.583Z	275.939° WNW	30.02°	2025-05-20 00:35:03.583Z	339.721° N
6 mins	2025-05-20 09:55:03.583Z	52.715° ENE	2025-05-20 09:57:03.583Z	73.578° E	16.788°	2025-05-20 10:01:03.583Z	113.602° SE

Authenticating...

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Check out CALSPHERE 4(A), 1520 on other resources

View CALSPHERE 4(A), 1520 on NASA - NSSDCA Website

View CALSPHERE 4(A), 1520 on Heavens-Above

View CALSPHERE 4(A), 1520 on Keep Track

View CALSPHERE 4(A), 1520 on Celestrak

View CALSPHERE 4(A), 1520 on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.