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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

11 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 11 hours ago

0 CALSPHERE 4(A)
1  1520U 65065H   25181.88379341  .00000097  00000-0  16885-3 0  9997
2  1520  89.9226 125.6043 0070580  16.7890  43.2493 13.36202592916204

Epoch: 2025-06-30T21:12Z

TLE epoch observation values (Epoch: 2025-06-30T21:12:39.75Z)

Latitude

60.6848°

Longitude

-111.6114°

Altitude

1,095.489 km

Speed

7.329 km/s

True Right ascension

08h 22m 57s

True Declination

60° 32' 40"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

53.42609°

Longitude

68.14416°

Altitude

1,151.08 km

Speed

7.273 km/s

Apparent Right ascension

04h 44m 55s

Apparent Declination

71° 44' 43"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

19:57:29

Azimuth

15.135° NNE

Elevation

26.682°

Doppler factor

Orbital elements

Apogee altitude

1,173.454 km

Perigee altitude

1,067.603 km

Semi-major axis

7,498.665 km

Eccentricity

0.00706

Inclination

89.9226°

RAAN

125.6043°

Arg. of periapsis

16.789°

True anomaly

Unknown

Mean anomaly

43.2493°

Eccentric anomaly

Unknown

Mean motion

3.34247 °/min

Orbital period

107.7 mins

BSTAR

0.00016885

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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	2025-07-01 08:19:22.904Z	15.221° NNE	2025-07-01 08:23:22.904Z	86.207° E	42.28°	2025-07-01 08:30:22.904Z	171.595° S
8 mins	2025-07-01 10:07:22.904Z	318.93° NNW	2025-07-01 10:10:22.904Z	287.215° WNW	20.162°	2025-07-01 10:15:22.904Z	241.349° WSW
11 mins	2025-07-01 20:23:22.904Z	165.079° S	2025-07-01 20:28:22.904Z	85.75° E	43.512°	2025-07-01 20:34:22.904Z	2.988° NNE
6 mins	2025-07-01 22:14:22.904Z	259.065° W	2025-07-01 22:16:22.904Z	279.935° WNW	16.584°	2025-07-01 22:20:22.904Z	319.04° NNW
11 mins	2025-07-02 07:40:22.904Z	26.388° NE	2025-07-02 07:45:22.904Z	88.143° E	30.891°	2025-07-02 07:51:22.904Z	149.085° SSE

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.