Institute of Space and Astronautical ScienceMu-3S-IIMu Center, Uchinoura Space Center, Japan
Yohkoh
Launched
August 30, 1991
Image: NASA/MSFC
Summary
Yohkoh launched on an Institute of Space and Astronautical Science Mu-3S-II from Mu Center, Uchinoura Space Center, Japan on August 30, 1991. It was Institute of Space and Astronautical Science's 26th launch, 1st this year and humanity's 3,661st orbital launch attempt. It was the 6th Mu-3S-II flight and the 1st this year. The payload was bound for low Earth orbit (LEO). Yohkoh, one of 9 catalogued objects, reached a 530 × 799 km orbit inclined 31.3°. 9 objects from this launch are catalogued, one of them a payload.
- Watch
- No webcast on record.
- Booster
- No booster details on record.
- Mission
- Earth Science · Low Earth Orbit (LEO)
- Milestone
- 6th Mu-3S-II flight · 1st this yearInstitute of Space and Astronautical Science's 26th launch1st this yearhumanity's 3,661st orbital launch attempt64th orbital launch attempt this year
Flight preview
Orbit: as tracked
Yohkoh · NORAD 21694 · 1991-062 · Space-Track · tracking 1 of 9 objects
Show the numbers for orbit elements
- Object
- SOLAR A (YOHKOH)
- Object ID
- 1991-062A
- Epoch
- 1991-08-30 05:27:07 UTC
- Mean motion
- 14.71220216 rev/day
- Eccentricity
- 0.0191603
- Inclination
- 31.3442°
- Ascending node
- 53.3748°
- Arg. of perigee
- 47.1499°
- Mean anomaly
- 315.3684°
- Element set
- 999
- Rev at epoch
- 2
- B*
- 0.0000038395
Perigee, apogee and period are Kepler figures from the catalogued mean elements, not a propagated state. Published orbit: LEO. Ascent drawn from padside's representative profile.
Catalogued objects
9 catalogued: 1 payload, 1 rocket stage, 5 debris, 2 components; none still in orbit
- Yohkoh · NORAD 21694 · re-entered September 12, 2005
M-3S2-6 Stage 3 · re-entered May 2, 2014
Data from J. McDowell, planet4589.org
About this launch
The objective of Solar A or Yohkoh (Japanese for sunbeam) is to study the high-energy radiations from solar flares (hard and soft X-rays and energetic neutrons) as well as quiet structures and pre-flare conditions. The mission is a successor to Hinotori, a previous Japanese spacecraft flown at the previous solar activity maximum in 1981.
Pad
Mu Center, Uchinoura Space Center, Japan
21st launch from Mu Center, 1st this year · 26th from Uchinoura Space Center, Japan
36 launches from this pad · 43 from Uchinoura Space Center, Japan
582 days after the previous launch from this pad
Questions
When did Yohkoh launch?
Yohkoh launched on August 30, 1991. The time is known to the hour, not the minute.
Where can I watch Yohkoh?
No webcast is on record for this launch.
What rocket launched Yohkoh?
Mu-3S-II, flown by Institute of Space and Astronautical Science. Mu-3S-II spec sheet
Where did Yohkoh launch from?
Mu Center, Uchinoura Space Center, Japan.
What orbit did Yohkoh reach?
Yohkoh, one of 9 catalogued objects, reached a 530 × 799 km orbit inclined 31.3°.
How many satellites did Yohkoh launch?
1 payload from this launch is catalogued, no longer in orbit (Data from J. McDowell, planet4589.org).