CALSPHERE 1

MilitaryLEOPolarUnited States

CALSPHERE 1 is a military satellite, as listed in Jonathan McDowell's GCAT catalogue, with ownership listed as United States in CelesTrak's catalogue, currently in low Earth orbit, around 965 km altitude. It completes one orbit of Earth roughly every 105 minutes at an inclination of 90.2°. It was launched in 1964. Track its live position and see when it passes over your location on azmth.

Orbital data

NORAD ID: 900
COSPAR ID: 1964-063C
Type: Military
Orbit: LEO
Perigee (lowest): 965 km
Apogee (highest): 1,001 km
Inclination: 90.22°
Orbital period: 105 min
Launch year: 1964
Owner (CelesTrak): United States

Orbital data updated: 2026-10-19 · from CelesTrak, refreshed every 2 hours.

Who operates it

United StatesLIVEMission ended 6 Oct 1964

Calibration target

GCAT lists it as Dragsphere 1.

Independent assessment

GCAT classes it as a military satellite for calibration and records its mission as ended on 6 Oct 1964 (17 Oct 2026).

Data: GCAT · CC BY 4.0 Class, mission and status adapted from GCAT by Jonathan McDowell, CC BY 4.0, data update 17 Oct 2026.

Military satellites, counted and explained →

About LEO orbit

Low Earth Orbit. Up to 2,000 km altitude. Where most satellites live including the ISS (~420 km), Starlink (~550 km), and Earth observation. Orbital period roughly 90 minutes.