Key statistics
Satellite TOPO 1 at a glance.
Uptime
20281
Days in orbit
Revolutions
≈ 13.5
Per day
Orbit
SSO
Sun Synchronous Orbit
Inclination
99.9
Latest
Satellite identification and parameters
Extended collection of information and parameters for TOPO 1.
Object identification
Identified? True
Debris? False
Object name: TOPO 1
International designator: 1970-025B
Object number (NORAD): 4363
Object ID (CCSDS): 4363
Country: UNITED STATES OF AMERICA (US)
Current information (Y/N): Y
RCS size: MEDIUM
Orbital parameters
Period: 106.929 minutes
Inclination: 99.8872 deg
SMA: 7462.616 km
Apoapsis: 1085.5 km
Periapsis: 1083.461 km
RAAN: 201.9572 deg
Eccentricy: 0.00013664
Argument of periapsis: 216.6307 deg
Mean anomaly: 216.6334 deg
Mean motion: 13.46685425 rev/day
Mean motion (dot): -0.00000019 rev/day2
B* drag term: 0.000042931013 1/REarth
Two-line elements (TLE)
Creation date: Oct. 17, 2025, 2:15 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 16, 2025, 8:50 p.m. UTC
TLE line 0: 0 TOPO 1
TLE line 1: 1 04363U 70025B 25289.86842549 -.00000019 00000-0 42931-4 0 9996
TLE line 2: 2 04363 99.8872 201.9572 0001366 216.6307 216.6334 13.46685425728442
Live tracking on map
Real-time ground track for satellite TOPO 1.
In-orbit conjunctions
There are no conjunctions computed for TOPO 1, at the moment. Check back to stay up to date, as we update our databases every day.
Go to all conjunctionsAssociated space launch
Meteorological research and development satellite
TOPO 1 was lifted into orbit during the mission ‘Thorad SLV-2G Agena D | Nimbus 4’, on board a Thorad SLV-2G Agena D space rocket.
The launch took place on April 8, 1970, 8:17 a.m. from Space Launch Complex 2E.
For more information about the launch, click the button.
Thorad SLV-2G Agena D | Nimbus 4
Agency: N/A
Status: Launch Successful
Launch date: April 8, 1970, 8:17 a.m. UTC
Rocket: Thorad SLV-2G Agena D
Launch pad: Space Launch Complex 2E
Location: Vandenberg SFB, CA, USA
...
Latest news about this satellite
There are no fresh news available about this satellite. Check back as we update our databases every day.
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