Encyclopedia Astronautica
EXOS


Japanese earth ionosphere satellite. 4 launches, 1978.02.04 (SS-05 Kyokko) to 1989.02.21 (Akebono). Optical investigations of ionosphere. EXOS-C (OHZORA).

Optical study of the stratosphere and middle atmosphere. Study of the specific phenomena of the ionospheric plasma over the southern Atlantic geomagnetic anomaly zone which was discovered by the third scientific satellite "TAIYO". Launch vehicle Mu-3S-4, launching organization ISAS (Institute of Space and Astronautical Science).

First Launch: 1978.02.04.
Last Launch: 1989.02.21.
Number: 4 .

More... - Chronology...


Associated Countries
See also
  • Mu The Japanese Mu launcher series provided a flexible all-solid propellant launch vehicle for access to space. It was the first Japanese launch vehicle designed from the start as an orbital launch vehicle. More...

Associated Launch Vehicles
  • Mu The Japanese Mu launcher series provided a flexible all-solid propellant launch vehicle for access to space. It was the first Japanese launch vehicle designed from the start as an orbital launch vehicle. More...
  • Mu-3H Japanese all-solid orbital launch vehicle. Five stage vehicle consisting of 8 x SB-310 + 1 x M-13 + 1 x M-22TVC + 1 x M-3A + 1 x KM-H More...
  • Mu-3S Japanese all-solid orbital launch vehicle. Four stage vehicle consisting of 8 x SB-310 + 1 x M-13TVC + 1 x M-22TVC + 1 x M-3A More...
  • Mu-3S-II Japanese all-solid orbital launch vehicle. Four stage vehicle consisting of 2 x SB-735 + 1 x M-13 + 1 x M-23 + 1 x M-3B More...
  • Mu-3 The Japanese Mu launcher series provided a flexible all-solid propellant launch vehicle for access to space. More...

Associated Manufacturers and Agencies
Bibliography
  • McDowell, Jonathan, Jonathan's Space Home Page (launch records), Harvard University, 1997-present. Web Address when accessed: here.
  • JPL Mission and Spacecraft Library, Jet Propulsion Laboratory, 1997. Web Address when accessed: here.
  • McDowell, Jonathan, Launch Log, October 1998. Web Address when accessed: here.

Associated Launch Sites
  • Kagoshima Japanese launch center for solid fueled sounding rockets and satellite launchers. Limited to two months a year due to disturbance of local fisheries. More...

EXOS Chronology


1978 February 4 - . 07:00 GMT - . Launch Site: Kagoshima. Launch Complex: Kagoshima M. LV Family: Mu. Launch Vehicle: Mu-3H. LV Configuration: Mu-3H M-3H-2.
  • SS-05 Kyokko - . Payload: Exos A. Mass: 103 kg (227 lb). Nation: Japan. Agency: ISAS. Class: Earth. Type: Ionosphere satellite. Spacecraft: EXOS. USAF Sat Cat: 10664 . COSPAR: 1978-014A. Apogee: 3,952 km (2,455 mi). Perigee: 639 km (397 mi). Inclination: 65.4000 deg. Period: 134.00 min. Auroral studies. Active life - two years. Function: 1) Observation of wide angle global auroral pictures using UV television camera. 2) Spectrophotometry of ultraviolet air glow. 3) Observation of the energy spectrum of photoelectrons and auroral electrons. 4) Mass spect rometry of the ionized atmospheric species in the thermosphere. 5) Measurements of density and temperature of ambient electrons in the thermosphere. 6) Observation of electromagnetic and plasma waves and the emission associated with auroral phenomena.

1978 September 16 - . 05:00 GMT - . Launch Site: Kagoshima. Launch Complex: Kagoshima M. LV Family: Mu. Launch Vehicle: Mu-3H. LV Configuration: Mu-3H M-3H-3.
  • SS-06 Jikiken - . Payload: Exos B. Mass: 100 kg (220 lb). Nation: Japan. Agency: ISAS. Class: Earth. Type: Ionosphere satellite. Spacecraft: EXOS. USAF Sat Cat: 11027 . COSPAR: 1978-087A. Apogee: 21,192 km (13,168 mi). Perigee: 251 km (155 mi). Inclination: 31.3000 deg. Period: 370.90 min. Launching organization: Institute of Space and Aeronautical Science, University of Tokyo. Stimulated plasma wave experiment, natural plasma wave measurement, plasma parameter measurement by VLF Doppler technique, electric field probe and plasma density me asurement, energetic particle analysis, and controlled electron beam emission experiment. Characteristics: weight 90.5 kg, configuration - polyhedron with 38 faces, height 0.6m , diameter 0.75m, attitude control spin stabilization, life two years.

1984 February 14 - . 08:00 GMT - . Launch Site: Kagoshima. Launch Complex: Kagoshima M. Launch Pad: M1. LV Family: Mu. Launch Vehicle: Mu-3S. LV Configuration: Mu-3S M-3S-4.
  • SS-09 Onzora - . Payload: Exos C. Mass: 180 kg (390 lb). Nation: Japan. Agency: ISAS. Class: Earth. Type: Ionosphere satellite. Spacecraft: EXOS. Decay Date: 1988-12-26 . USAF Sat Cat: 14722 . COSPAR: 1984-015A. Apogee: 331 km (205 mi). Perigee: 247 km (153 mi). Inclination: 74.6000 deg. Period: 90.30 min. Optical investigations of ionosphere. EXOS-C (OHZORA). Optical study of the stratosphere and middle atmosphere. Study of the specific phenomena of the ionospheric plasma over the southern Atlantic geomagnetic anomaly zone which was discovered by the third scientific satellite 'TAIYO'. Launch vehicle Mu-3S-4, launching organization ISAS (Institute of Space and Astronautical Science). Launch time 0800 GMT.

1989 February 21 - . 23:30 GMT - . Launch Site: Kagoshima. Launch Complex: Kagoshima M. Launch Pad: M1. LV Family: Mu. Launch Vehicle: Mu-3S-II. LV Configuration: Mu-3S-II M-3S2-4.
  • Akebono - . Payload: Exos D. Mass: 295 kg (650 lb). Nation: Japan. Agency: ISAS. Class: Earth. Type: Ionosphere satellite. Spacecraft: EXOS. USAF Sat Cat: 19822 . COSPAR: 1989-016A. Apogee: 8,554 km (5,315 mi). Perigee: 272 km (169 mi). Inclination: 75.1000 deg. Period: 185.90 min. Summary: Studied aurora borealis, auroral australis. EXOS-D (Akebono). Observation in high precision of behaviour and acceleration mechanism of aurora particles in Earth magnetosphere. Launching organization ISAS. Launch time 2330 GMT. .

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