Calsphere 1, 2, 3, 4

The Calsphere (Calibration Sphere) satellites were passive sperical radar calibratiuon target built by the Naval Research Laboratory (NRL).

Nation: USA
Type / Application: Radar calibration
Operator: Naval Research Laboratory (NRL)
Contractors: Naval Research Laboratory (NRL)
Equipment:
Configuration:
Propulsion: None
Power: None
Lifetime:
Mass: 1.4 kg (#1); 4 kg (#2); 4.5 kg (#3); 5 kg (#4)
Orbit:
Satellite Date LS Launch Vehicle Remarks
Calsphere 1 13.12.1962 Va 75-1-1 Thor-DM21 Agena-D with Injun 3, Poppy 1, Surcal 2, NRL-PL 121
Calsphere 2 (NRL-PL 158 ?) 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) 31.05.1967 Va SLC-2W Thor-DM21 Agena-D with Poppy 5, Timation 1, GGSE 4, GGSE 5, Calsphere 4, NRL-PL 153, NRL-PL 159, OPS 5712
Calsphere 4 (NRL-PL 150B) 31.05.1967 Va SLC-2W Thor-DM21 Agena-D with Poppy 5, Timation 1, GGSE 4, GGSE 5, Calsphere 3, NRL-PL 153, NRL-PL 159, OPS 5712