COSMOS 1125
NORAD 11510
Payload
LEO
1979-078A
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🛰️ Orbital Parameters
Perigee
770 km
Apogee
786 km
Inclination
74.0°
Period
100.4 min
Mean Motion
14.34120296 rev/day
TLE Epoch
2026-05-08 14:00:00 UTC
📐 Computed Orbital Characteristics
Avg. Altitude778 km
Orbital Velocity26,881 km/h
Velocity7.47 km/s
Orbital Period100 minutes
Orbits / Day14.34
Eccentricity0.0011
Semi-Major Axis7,149 km
Est. Orbital Lifetime~25–100 years
🚀 Launch & Identity
Country / Operator
🇷🇺 Russia (CIS)
Launch Date
1979-08-28
Launch Site
PKMTR
Int'l Designator
1979-078A
Object Type
Payload
RCS Size
Large (>1 m²)
📖 About This Object
COSMOS 1125 is an active satellite operated by Russia (CIS), launched on 1979-08-28 from PKMTR. With over 47 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Low Earth Orbit (LEO) at altitudes between 770 km and 786 km with an inclination of 74.0°. It travels at approximately 26,881 km/h (7.47 km/s), completing one full orbit every 100 minutes — that’s roughly 14.34 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~25–100 years. Orbital Radar tracks COSMOS 1125 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.
🌍 Orbit Context
COSMOS 1125 occupies the mid-LEO band between 600 and 1,000 km, where atmospheric drag is minimal but radiation exposure remains low. This altitude range balances orbital longevity (decades to centuries) with reasonable ground coverage, making it popular for remote sensing constellations, scientific instruments and weather satellites. Debris concerns are significant here because objects persist far longer than in lower orbits.
🔗 Cosmos (Military/Government) Series
This satellite carries the Cosmos designation, used by Russia (and formerly the Soviet Union) as a generic identifier for military and government spacecraft. The Cosmos series encompasses reconnaissance, signals intelligence (SIGINT), early warning, navigation, communications and scientific payloads. Many Cosmos satellites have classified missions with limited publicly available information.
❓ Frequently Asked Questions
COSMOS 1125 orbits in Low Earth Orbit (LEO) at altitudes between 770 km (perigee) and 786 km (apogee), with an average altitude of approximately 778 km. It completes one orbit every 100 minutes, travelling at approximately 26,881 km/h (16,703 mph).
COSMOS 1125 is operated by Russia (CIS). It is catalogued by the U.S. Space Surveillance Network under NORAD ID 11510. You can track COSMOS 1125 in real time on Orbital Radar’s live tracker.
COSMOS 1125 was launched on 1979-08-28 from PKMTR. At its current altitude, the estimated remaining orbital lifetime is: ~25–100 years.
Yes — Orbital Radar tracks COSMOS 1125 (NORAD ID 11510) using the latest TLE (two-line element set) data from Space-Track and CelesTrak. Open the live tracker to see its current position, altitude, speed and orbital path updated in real time.
COSMOS 1125 travels at approximately 26,881 km/h (16,703 mph) — roughly 7.47 km/s. It completes 14.34 orbits per day, meaning the crew or instruments aboard (if any) would experience approximately 29 sunrises and sunsets every 24 hours.