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Calsphere
Calsphere 1
Calsphere 1
Credit: Manufacturer Image
American military target satellite. Radar calibration objects (but also cover for other classified subsatellites). Radar calibration satellite for Naval Research Laboratory (NRL), USA. Launched 1962-1967.

AKA: Dragsphere. Status: Operational 1962. First Launch: 1962-12-13. Last Launch: 1971-02-17. Number: 12 . Gross mass: 1.00 kg (2.20 lb).


More at: Calsphere.

Family: Medium earth orbit, Military, Military target sat, Surveillance. Country: USA. Launch Vehicles: Atlas, Thor, Delta, Thor Ablestar, Atlas F, Thor Agena D, Thor SLV-2 Agena D, Thor Burner 2, Atlas Burner 2, Thor Burner. Launch Sites: Vandenberg, Vandenberg SLC2E, Vandenberg SLC10W, Vandenberg SLC2W, Vandenberg SLC3E. Agency: USAF, U.S. Navy. Bibliography: 2, 279, 6.
Photo Gallery

Calsphere 1Calsphere 1
Credit: Manufacturer Image


Calsphere 4Calsphere 4
Credit: Manufacturer Image



1962 December 13 - . 04:07 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC2E. LV Family: Thor. Launch Vehicle: Thor Agena D.
  • Calsphere 1A - . Mass: 23 kg (50 lb). Nation: USA. Agency: USAF, USN. Class: Surveillance. Type: Naval signals intelligence satellite. Spacecraft: Calsphere. Decay Date: 1967-02-05 . USAF Sat Cat: 513 . COSPAR: 1962-B-Tau-5. Apogee: 2,069 km (1,285 mi). Perigee: 228 km (141 mi). Inclination: 70.3000 deg. Period: 108.40 min. Surveillance calibration..

1964 October 6 - . 17:04 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC2W. LV Family: Thor. Launch Vehicle: Thor Ablestar.
  • Calsphere 2 - . Payload: Dragsphere 2. Mass: 10 kg (22 lb). Nation: USA. Agency: USN. Class: Surveillance. Type: Radar calibration target. Spacecraft: Calsphere. USAF Sat Cat: 902 . COSPAR: 1964-063E. Apogee: 1,078 km (669 mi). Perigee: 1,049 km (651 mi). Inclination: 90.2000 deg. Period: 106.50 min. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A). .
  • Calsphere 1 - . Payload: Dragsphere 1. Mass: 1.00 kg (2.20 lb). Nation: USA. Agency: USN. Class: Surveillance. Type: Radar calibration target. Spacecraft: Calsphere. USAF Sat Cat: 900 . COSPAR: 1964-063C. Apogee: 1,034 km (642 mi). Perigee: 997 km (619 mi). Inclination: 90.1000 deg. Period: 105.50 min. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A). .

1965 August 13 - . 22:11 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC2E. LV Family: Thor. Launch Vehicle: Thor Ablestar.
  • Calsphere 4A - . Payload: NRL PL 158?. Mass: 2.00 kg (4.40 lb). Nation: USA. Agency: USN. Class: Surveillance. Type: Radar calibration target. Spacecraft: Calsphere. USAF Sat Cat: 1520 . COSPAR: 1965-065H. Apogee: 1,179 km (732 mi). Perigee: 1,077 km (669 mi). Inclination: 90.1000 deg. Period: 107.90 min. Surveillance Calibration; white 14 inch dia. sphere. .

1967 May 31 - . 09:30 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC2W. LV Family: Thor. Launch Vehicle: Thor SLV-2 Agena D.
  • Calsphere 4 - . Payload: Agena D 2704 / OPS 5712. Nation: USA. Agency: NRL. Class: Surveillance. Type: Radar calibration target. Spacecraft: Calsphere. USAF Sat Cat: 2826 . COSPAR: 1967-053A. Apogee: 834 km (518 mi). Perigee: 815 km (506 mi). Inclination: 69.9000 deg. Period: 101.40 min. The last Air Force Thor/Agena D, SLV-2 #443 and SS-01B #2704, was launched from Vandenberg. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A). .
  • Calsphere 3 - . Payload: NRL PL159. Mass: 38 kg (83 lb). Nation: USA. Agency: NRL. Class: Surveillance. Type: Radar calibration target. Spacecraft: Calsphere. USAF Sat Cat: 2872 . COSPAR: 1967-053F. Apogee: 906 km (562 mi). Perigee: 900 km (550 mi). Inclination: 70.0000 deg. Period: 103.10 min. Surveillance Calibration. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A). .

1968 August 16 - . 20:57 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC3E. LV Family: Atlas. Launch Vehicle: Atlas Burner 2. FAILURE: Failure.
  • AVL-802 Rigid Sphere - . Payload: AVL-802. Nation: USA. Agency: USAF AFSC. Spacecraft: Calsphere.

    An Atlas/Burner II (SLV-3, #7004), the first Atlas to be launched with a Burner II upper stage, was launched from Space Launch Complex 3 East (SLC-3E) at Vandenberg but failed to place its payload in orbit due to a malfunction of the nose-fairing heat shield separation system.


1971 February 17 - . 03:52 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC10W. LV Family: Thor. Launch Vehicle: Thor Burner 2.
  • Calsphere 5 - . Payload: NRL PL170C / OPS 5268. Mass: 1.00 kg (2.20 lb). Nation: USA. Agency: NRL. Class: Surveillance. Type: Radar calibration target. Spacecraft: Calsphere. Decay Date: 1990-01-07 . USAF Sat Cat: 4963 . COSPAR: 1971-012E. Apogee: 360 km (220 mi). Perigee: 340 km (210 mi). Inclination: 98.2000 deg. Period: 91.50 min. Radar calibarion sphere. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A). .
  • Calsphere 4 - . Payload: NRL PL170B / OPS 5268. Mass: 1.00 kg (2.20 lb). Nation: USA. Agency: NRL. Class: Surveillance. Type: Radar calibration target. Spacecraft: Calsphere. Decay Date: 1989-09-20 . USAF Sat Cat: 4958 . COSPAR: 1971-012D. Apogee: 502 km (311 mi). Perigee: 486 km (301 mi). Inclination: 98.4000 deg. Period: 94.50 min. Radar calibarion sphere. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A). .
  • Calsphere 3A - . Payload: NRL PL170A / OPS 5268. Mass: 1.00 kg (2.20 lb). Nation: USA. Agency: NRL. Class: Surveillance. Type: Radar calibration target. Spacecraft: Calsphere. Decay Date: 1989-10-17 . USAF Sat Cat: 4957 . COSPAR: 1971-012C. Apogee: 531 km (329 mi). Perigee: 509 km (316 mi). Inclination: 98.4000 deg. Period: 95.00 min. Radar calibarion sphere. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A). .


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