Final Diamant-B flight from Kourou carrying France's Castor (D-5B) upper-atmosphere science satellite and Pollux (D-5A) technology payload; fairing separation failure prevented orbit.
- Outcome
- Failure
- Orbit
- LEO
- Low Earth orbit
- Payload to orbit
- Did not reach orbit
- Flight
- 5th
- of 5 Diamant B flights
- Date and time
- 21 May 1973, 08:47 UTC
- Rocket
- Diamant B
- Builder
- SEREB
- Launch site
- Diamant Launch Area, Guiana Space Centre, French Guiana
- Payload
- Earth Science
- Launches in 1973
- 32nd of 116