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Calsphere 1, 2, 3, 4

Calsphere [NRL]

The Calsphere (Calibration Sphere) satellites were passive spherical surveillance calibration target built by the Naval Research Laboratory (NRL).

These satellites were launched on three cluster launches of multiple small satellites.

Nation: USA
Type / Application: Radar calibration
Operator: Naval Research Laboratory (NRL)
Contractors: Naval Research Laboratory (NRL)
Equipment:
Configuration:
Propulsion: None
Power: None
Lifetime: Passive
Mass: 1.4 kg (#1); 4 kg (#2); 4.5 kg (#3); 5 kg (#4)
Orbit: 231 km × 2748 km, 70.34 (#1); 1083 km × 1194 km, 90.04 (#2); 913 km × 936 km, 69.97 (#3); 914 km × 925 km, 69.98 (#4)
Satellite COSPAR Date LS Launch Vehicle Remarks
Calsphere 1 1962 βτ 5 13.12.1962 Va 75-1-1 P Thor-DM21 Agena-D with Poppy 3A, Poppy 3B, Injun 3, Surcal 2, Wild Bill 2
Calsphere 2 (NRL-PL 158 ?) 1965-065H 13.08.1965 Va 75-1-1 Thor-DSV2A Able-Star with Transit-O 5, Long Rod, Tempsat 1, Dodecapole 2, Surcal 5
Calsphere 3 (NRL-PL 160) 1967-053A 31.05.1967 Va SLC-2W Thor-DM21 Agena-D with Poppy 7A, Poppy 7B (GGSE 4), Poppy 7C, Poppy 7D (GGSE 5), Timation 1, Calsphere 4, NRL-PL 150B, OPS 5712
Calsphere 4 (NRL-PL 159) 1967-053F 31.05.1967 Va SLC-2W Thor-DM21 Agena-D with Poppy 7A, Poppy 7B (GGSE 4), Poppy 7C, Poppy 7D (GGSE 5), Timation 1, Calsphere 3, NRL-PL 150B, OPS 5712

References: