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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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<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

6 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 6 hours ago

0 CALSPHERE 4(A)
1 01520U 65065H   25128.94671052  .00000139  00000-0  24957-3 0  9995
2 01520  89.9200 126.0051 0070054 162.6622 282.9163 13.36192144908725

Epoch: 2025-05-08T22:43Z

Definitive object data (Epoch: 2025-05-08T22:43:15.788Z)

Latitude

84.81403°

Longitude

-80.94362°

Altitude

1,125.884 km

Speed

7.302 km/s

True Right ascension

08h 27m 31s

True Declination

84° 47' 04"

Sunlit

Object was in daylight at TLE epoch

Visualization TLE readout

Latitude

-66.02718°

Longitude

98.35638°

Altitude

1,142.722 km

Speed

7.284 km/s

Apparent Right ascension

23h 20m 20s

Apparent Declination

-58° 46' 12"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

13:03:06

Azimuth

147.733° SSE

Elevation

-65.097°

Doppler factor

Orbital elements

Apogee altitude

1,173.099 km

Perigee altitude

1,068.036 km

Semi-major axis

7,498.704 km

Eccentricity

0.0070054

Inclination

89.92°

RAAN

126.0051°

Arg. of periapsis

162.6622°

True anomaly

282.13234°

Mean anomaly

282.9163°

Eccentric anomaly

282.52447°

Mean motion

3.34244 °/min

BSTAR

0.00024957

Orbital period

107.71 mins

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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.
12 mins	2025-05-09 11:28:31.741Z	15.567° NNE	2025-05-09 11:34:31.741Z	87.561° E	35.619°	2025-05-09 11:40:31.741Z	158.042° S
9 mins	2025-05-09 13:17:31.741Z	332.387° NNW	2025-05-09 13:21:31.741Z	287.56° WNW	25.019°	2025-05-09 13:26:31.741Z	232.365° WSW
11 mins	2025-05-09 23:34:31.741Z	150.988° SSE	2025-05-09 23:39:31.741Z	84.853° E	38.632°	2025-05-09 23:45:31.741Z	9.668° NNE
9 mins	2025-05-10 01:23:31.741Z	235.352° WSW	2025-05-10 01:27:31.741Z	279.402° WNW	23.781°	2025-05-10 01:32:31.741Z	330.083° NNW

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.