|Manufacturer||ERNO Raumfahrttechnik GmbH|
|Country of origin||Germany|
|Used on||Europa 1 third stage.|
|Height||3.36 m (132 in)|
|Diameter||2.00 m (79 in)|
|Gross mass||3,370 kg (7,430 lb)|
|Propellant mass||2,760 kg (6,080 lb)|
|Empty mass||610 kg (1,340 lb)|
|Engines||1 Astris (rocket engine)|
|Thrust||23.3 kilonewtons (5,200 lbf)|
|Specific impulse||310 s (3.0 km/s)|
|Propellant||Aerozine 50 / N2O4|
The Astris was an upper stage developed by ERNO Raumfahrttechnik GmbH and MBB as the third stage of the Europa 1 launch vehicle. It was the German contribution to the project and only flew activated four times. The high failure rate of the three and four stage rocket meant that the project was cancelled.
On November 29, 1968, its inaugural flight, the Astris third stage exploded. On the second attempt on July 1969, the Astris engine failed to start. On the third attempt on June 11, 1970, the stage performed correctly, but the fairing failed to separate. On November 5, 1971, the Europa II launched from CSG ELA-1, had a mishap due to structural failure of the third stage. After this last failure the project was definitely cancelled.
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