Key statistics
Satellite HELIOS 1B at a glance.
Uptime
9409
Days in orbit
Revolutions
≈ 14.9
Per day
Orbit
SSO
Sun Synchronous Orbit
Inclination
98.2
Latest
Satellite identification and parameters
Extended collection of information and parameters for HELIOS 1B.
Object identification
Identified? True
Debris? False
Object name: HELIOS 1B
International designator: 1999-064A
Object number (NORAD): 25977
Object ID (CCSDS): 25977
Country: FRANCE (FR)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 96.858 minutes
Inclination: 98.1824 deg
SMA: 6986.329 km
Apoapsis: 608.836 km
Periapsis: 607.551 km
RAAN: 140.7512 deg
Eccentricy: 0.000092
Argument of periapsis: 38.6886 deg
Mean anomaly: 321.4394 deg
Mean motion: 14.86720168 rev/day
Mean motion (dot): 0.00002222 rev/day2
B* drag term: 0.00025641338 1/REarth
Two-line elements (TLE)
Creation date: Sept. 6, 2025, 2:09 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Sept. 5, 2025, 11:05 p.m. UTC
TLE line 0: 0 HELIOS 1B
TLE line 1: 1 25977U 99064A 25248.96230769 .00002222 00000-0 25641-3 0 9990
TLE line 2: 2 25977 98.1824 140.7512 0000920 38.6886 321.4394 14.86720168657809
Live tracking on map
Real-time ground track for satellite HELIOS 1B.
In-orbit conjunctions
A list of the most updated potential collisions computed for object HELIOS 1B.
Associated space launch
The Helios program is Europe's military optical reconnaissance system consisting of both a space and a ground segment, which commenced service in 1995, jointly funded by the French, Italian and Spanish governments. The Helios I optical observation satellites, launched in July 1995 and December 1999 respectively, can acquire high resolution images of any point on the globe, with daily revisit capability. Helios-1B had suffered a breakdown of its power supply system in October 2004 and could no longer perform any work after operating for just under its 5-year nominal life expectancy.
HELIOS 1B was lifted into orbit during the mission ‘Ariane 40 | Helios 1B’, on board a Ariane 40 space rocket.
The launch took place on Dec. 3, 1999, 4:22 p.m. from Ariane Launch Area 2.
For more information about the launch, click the button.
Ariane 40 | Helios 1B
Agency: N/A
Status: Launch Successful
Launch date: Dec. 3, 1999, 4:22 p.m. UTC
Rocket: Ariane 40
Launch pad: Ariane Launch Area 2
Location: Guiana Space Centre, French Guiana
...
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