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CALSPHERE 4A — Live Satellite Tracking (NORAD 1520)
Track CALSPHERE 4A (NORAD catalog number 1520) live on the WatchSat interactive 3D globe above. Its position is propagated in real time from the latest CelesTrak two-line element set using the SGP4/SDP4 orbital model — the same math professional trackers run. It is object H of 1965's 65th orbital launch (COSPAR designation 1965-065H). It went up together with 1 other satellite from that launch still in the active catalog.
Moving at about 7.34 km/s, CALSPHERE 4A flies in low Earth orbit at an altitude of roughly 1,079 × 1,181 km, completing one revolution every 107.8 minutes — about 13.4 trips around Earth per day. The orbit is essentially circular (eccentricity 0.0068). Inclined 89.9° — nearly pole-to-pole — its ground track sweeps essentially every latitude. Its orbital plane crosses the equator northbound at right ascension 121.7°.
Orbital elements
| Orbit regime | low Earth orbit (LEO) |
|---|---|
| Perigee × apogee altitude | ~1,079 km × 1,181 km |
| Inclination | 89.89° |
| Orbital period | 107.8 min (13.36 rev/day) |
| Eccentricity | 0.00681 |
| Element set epoch | 2026-09-07 |
| COSPAR designation | 1965-065H |
| NORAD catalog number | 1520 |
This page's orbital elements come from the CelesTrak catalog of 2026-09-08. The live 3D view above fetches its own current CelesTrak data when the page opens, through an edge cache that refreshes roughly every 30 minutes.
About the Other Active Satellites group
CALSPHERE 4A is one of 4,471 active satellites in WatchSat's general catalog — the broad population of Earth-observation, communications, science, amateur-radio and technology spacecraft outside the giant broadband constellations. Browse all other active satellites live in 3D.
Can you see CALSPHERE 4A from the ground?
Sometimes. Like most low-Earth-orbit spacecraft, CALSPHERE 4A is visible only around dawn and dusk, when your sky is dark but the satellite is still sunlit — and whether you can spot it depends on its size and reflectivity. See pass predictions for your location for when it is above your horizon and sunlit.
Related satellites
Nearest catalog neighbors of CALSPHERE 4A in the Other Active Satellites group — usually craft from the same or adjacent launches:
- TEMPSAT 1 (NORAD 1512)
- LCS 1 (NORAD 1361)
- CALSPHERE 2 (NORAD 902)
- CALSPHERE 1 (NORAD 900)
- OPS 5712 (P/L 160) (NORAD 2826)
- LES-5 (NORAD 2866)
Browse the Other Active Satellites directory or the full satellite directory · What is a TLE? · WatchSat live globe