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    Photographic and Radiometric Observations of the HAYABUSA Re-Entry

    Access Status
    Open access via publisher
    Authors
    Borovicka, J.
    Abe, S.
    Shrbený, L.
    Spurney, P.
    Bland, Phil
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Borovicka, J. and Abe, S. and Shrbený, L. and Spurný, P. and Bland, P. 2011. Photographic and Radiometric Observations of the HAYABUSA Re-Entry. Publications of Astronomical Society of Japan. 63 (5): pp. 1003-1009.
    Source Title
    Publications of Astronomical Society of Japan
    DOI
    10.1093/pasj/63.5.1003
    ISSN
    0004-6264
    URI
    http://hdl.handle.net/20.500.11937/36289
    Collection
    • Curtin Research Publications
    Abstract

    We analyzed photographic observations of the re-entry of the HAYABUSA spacecraft and capsule over Southern Australia on 2010 June 13, 13:52 UT. Radiometric measurements of the brightness of the associated fireball were obtained as well. We derived the trajectories and velocities of the spacecraft, its four fragments, and the capsule. The capsule trajectory was within a few hundred meters of the trajectory predicted by JAXA prior to re-entry. The spacecraft trajectory was about 1 km higher than the capsule trajectory. Two major fragments separated from the spacecraft at a height of about 62 km with a mutual lateral velocity of 250 m s −1 . The maximum absolute magnitude of the fireball of − 12.6 was reached at a height of 67 km. The dynamic pressures acting on the spacecraft at the fragmentation points were only 1–50 kPa. No spacecraft fragment was seen to survive below a height of 47 km. The integral luminous efficiency of the event was 1.3%. As expected, the capsule had a very low luminous efficiency and very low ablation coefficient. The ablation coefficients and masses of the major spacecraft fragments are discussed.

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