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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

7 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 7 hours ago

0 CALSPHERE 4(A)
1 01520U 65065H   25186.60004708  .00000077  00000-0  13141-3 0  9994
2 01520  89.9228 125.5690 0070108   3.6277  49.8420 13.36203430916421

Epoch: 2025-07-05T14:24Z

TLE epoch observation values (Epoch: 2025-07-05T14:24:04.067Z)

Latitude

54.18105°

Longitude

-14.17729°

Altitude

1,098.734 km

Speed

7.324 km/s

True Right ascension

08h 22m 42s

True Declination

54° 01' 31"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

14.44492°

Longitude

-14.26614°

Altitude

1,074.143 km

Speed

7.341 km/s

Apparent Right ascension

06h 37m 48s

Apparent Declination

-38° 54' 25"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

09:19:41

Azimuth

210.379° SW

Elevation

2.926°

Doppler factor

Orbital elements

Apogee altitude

1,173.097 km

Perigee altitude

1,067.953 km

Semi-major axis

7,498.662 km

Eccentricity

0.00701

Inclination

89.9228°

RAAN

125.569°

Arg. of periapsis

3.6277°

True anomaly

Unknown

Mean anomaly

49.842°

Eccentric anomaly

Unknown

Mean motion

3.34247 °/min

Orbital period

107.7 mins

BSTAR

0.00013141

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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.
10 mins	2025-07-05 21:26:39.845Z	224.123° SW	2025-07-05 21:31:39.845Z	282.686° WNW	26.201°	2025-07-05 21:36:39.845Z	334.621° NNW
8 mins	2025-07-06 06:56:39.845Z	43.867° NE	2025-07-06 06:59:39.845Z	75.227° E	20.96°	2025-07-06 07:04:39.845Z	124.59° SE
12 mins	2025-07-06 08:42:39.845Z	352.146° N	2025-07-06 08:47:39.845Z	292.209° WNW	41.217°	2025-07-06 08:54:39.845Z	199.212° SSW
8 mins	2025-07-06 19:02:39.845Z	111.175° ESE	2025-07-06 19:05:39.845Z	77.036° E	22.08°	2025-07-06 19:10:39.845Z	25.895° NE
11 mins	2025-07-06 20:47:39.845Z	198.421° SSW	2025-07-06 20:52:39.845Z	261.782° W	38.845°	2025-07-06 20:58:39.845Z	346.436° N

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.