Key statistics
Satellite H-1 R/B at a glance.
Uptime
12992
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: 110.452 minutes
Inclination: 99.0233 deg
SMA: 7625.634 km
Apoapsis: 1604.916 km
Periapsis: 890.083 km
RAAN: 226.9091 deg
Eccentricy: 0.04687039
Argument of periapsis: 111.5995 deg
Mean anomaly: 253.5719 deg
Mean motion: 13.03733404 rev/day
Mean motion (dot): 0.00000108 rev/day2
B* drag term: 0.0002586241 1/REarth
Two-line elements (TLE)
Creation date: Sept. 3, 2025, 2:21 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Sept. 2, 2025, 10:09 p.m. UTC
TLE line 0: 0 H-1 R/B
TLE line 1: 1 20491U 90013D 25245.92339772 .00000108 00000-0 25862-3 0 9994
TLE line 2: 2 20491 99.0233 226.9091 0468704 111.5995 253.5719 13.03733404691593
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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