Key statistics
Satellite H-1 R/B at a glance.
Uptime
12934
Days in orbit
Revolutions
≈ 13.0
Per day
Orbit
SSO
Sun Synchronous Orbit
Inclination
99.0
Latest
Satellite identification and parameters
Extended collection of information and parameters for H-1 R/B.
Object identification
Identified? True
Debris? False
Object name: H-1 R/B
International designator: 1990-013D
Object number (NORAD): 20491
Object ID (CCSDS): 20491
Country: JAPAN (JPN)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 110.454 minutes
Inclination: 99.0128 deg
SMA: 7625.708 km
Apoapsis: 1603.61 km
Periapsis: 891.536 km
RAAN: 177.9258 deg
Eccentricy: 0.046689
Argument of periapsis: 248.7716 deg
Mean anomaly: 106.2928 deg
Mean motion: 13.03714515 rev/day
Mean motion (dot): 0.00000021 rev/day2
B* drag term: 0.00010815 1/REarth
Two-line elements (TLE)
Creation date: July 6, 2025, 6:05 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: July 6, 2025, 12:29 p.m. UTC
TLE line 0: 0 H-1 R/B
TLE line 1: 1 20491U 90013D 25187.52072187 .00000021 00000-0 10815-3 0 9995
TLE line 2: 2 20491 99.0128 177.9258 0466890 248.7716 106.2928 13.03714515683986
Live tracking on map
Real-time ground track for satellite H-1 R/B.
Associated space launch
Japanese Earth observation satellite
H-1 R/B was lifted into orbit during the mission ‘H-1 | Momo 1b’, on board a H-1 space rocket.
The launch took place on Feb. 7, 1990, 1:33 a.m. from Osaki Launch Complex.
For more information about the launch, click the button.
H-1 | Momo 1b
Agency: N/A
Status: Launch Successful
Launch date: Feb. 7, 1990, 1:33 a.m. UTC
Rocket: H-1
Launch pad: Osaki Launch Complex
Location: Tanegashima Space Center, Japan
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