CALSPHERE 4A

MilitaryLEOPolarUnited States

CALSPHERE 4A 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 1,077 km altitude. It completes one orbit of Earth roughly every 108 minutes at an inclination of 89.9°. It was launched in 1965. Track its live position and see when it passes over your location on azmth.

Orbital data

NORAD ID: 1520
COSPAR ID: 1965-065H
Type: Military
Orbit: LEO
Perigee (lowest): 1,077 km
Apogee (highest): 1,184 km
Inclination: 89.89°
Orbital period: 108 min
Launch year: 1965
Owner (CelesTrak): United States

Orbital data updated: 2026-10-18 · from CelesTrak, refreshed every 2 hours.

Who operates it

United StatesLIVEMission ended 13 Aug 1965

Calibration target

GCAT lists it as Calsphere.

Independent assessment

GCAT classes it as a military satellite for calibration and records its mission as ended on 13 Aug 1965 (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.