For the company traded under the stock symbol OREX, see Orexigen Therapeutics.
Mission type Technology
Operator NASDA
COSPAR ID 1994-007A
SATCAT № 22978
Website www.jaxa.jp/projects/rockets/orex/index_e.html
Mission duration 2 hours
Spacecraft properties
Manufacturer NASDA
Launch mass 865 kilograms (1,907 lb)
Landing mass 761 kilograms (1,678 lb)
Start of mission
Launch date 3 February 1994, 22:20 (1994-02-03UTC22:20Z) UTC[1]
Rocket H-II
Launch site Tanegashima Yoshinobu 1
End of mission
Landing date 4 February 1994, 00:30 (1994-02-04UTC00:31Z) UTC[2]
Landing site Pacific Ocean
Orbital parameters
Reference system Geocentric
Regime Low Earth
Perigee 448 kilometres (278 mi)
Apogee 458 kilometres (285 mi)
Inclination 30.5 degrees
Period 93.64 minutes
Epoch 3 February 1994[3]

OREX (Orbital Re-entry Experiment) was a NASDA re-entry demonstrator prototype which was launched in 1994 on the H-II launcher; the satellite was renamed Ryūsei (りゅうせい Shooting star). It was a precursor for the Japanese space Shuttle Hope.

OREX tested various communications systems, heating profiles and heat shielding components for Hope.


  1. McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 9 November 2013.
  2. McDowell, Jonathan (7 February 1994). "Issue 183". Jonathan's Space Report. Retrieved 9 November 2013.
  3. McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 9 November 2013.

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