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Accidental Collision of DMSP R/B and Chinese Debris on 17 January 2005

Accidental Collision of DMSP R/B and Chinese Debris on 17 January 2005. 7 February 2005 Summary. Executive Summary.

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Accidental Collision of DMSP R/B and Chinese Debris on 17 January 2005

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  1. Accidental Collision of DMSP R/B and Chinese Debrison 17 January 2005 7 February 2005 Summary

  2. Executive Summary • The second known accidental collision between two Earth satellites from different missions occurred on 17 January 2005, involving a 1974 US rocket body and debris from a Chinese rocket body which exploded in March 2000. • Both objects were in similar retrograde orbits. • The collision occurred at an altitude of 885 km. • Only two debris from the US rocket body had been detected within three weeks of the event. • The only other known accidental collision between two Earth satellites from different missions occurred on 24 July 1996, involving the 1995 French CERISE spacecraft and debris from a French rocket body which exploded in November 1986.

  3. Collision Summary • Time and Location of Collision: 0214 GMT, 17 January 2005 80.6 S, 306.8 E • Altitude of Collision: 885 km • Satellites Involved in Collision: US DMSP 5B F5 R/B (Thor-Burner 2A final stage) Sat. No. 07219, Int. Designator 1974-015B Launched 16 March 1974 Orbit at time of collision: 775 km by 885 km Chinese CZ-4 Third Stage Debris Sat. No. 26207, Int. Designator 1999-057CV Created during Explosion on 11 March 2000 Orbit at time of collision: 700 km by 895 km • New Debris Created: Two pieces from DMSP R/B tracked (Sat. No.s 81057 and 87876)

  4. Location of Collision • Groundtracks +/- 30 minutes of 0214 GMT, 17 January 2005 CZ-4 Debris DMSP R/B

  5. Location of Collision, Alternate View DMSP R/B CZ-4 Debris 700 km by 895 km 98.2 deg inclination 775 km by 885 km 99.1 deg inclination Collision Altitude: 885 km

  6. Colliding Objects plus 2 Debris Graphic by AFSPC/1SPCS

  7. New Debris from DMSP R/B Graphic by AFSPC/1SPCS

  8. Perturbation of CZ-4 Debris Orbit Graphic by AFSPC/1SPCS

  9. Breakup of CZ-4 in March 2000(1999-057C, Sat. No. 25942) • CZ-4 third stage suffered a post-mission, propellant-induced breakup on 11 March 2000. More than 300 debris were officially cataloged. A total of 176 cataloged debris remained in orbit on 17 January 2005.

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