Space Science Reviews

, Volume 208, Issue 1–4, pp 17–31 | Cite as

Preflight Calibration Test Results for Optical Navigation Camera Telescope (ONC-T) Onboard the Hayabusa2 Spacecraft

  • S. Kameda
  • H. Suzuki
  • T. Takamatsu
  • Y. Cho
  • T. Yasuda
  • M. Yamada
  • H. Sawada
  • R. Honda
  • T. Morota
  • C. Honda
  • M. Sato
  • Y. Okumura
  • K. Shibasaki
  • S. Ikezawa
  • S. Sugita
Article

Abstract

The optical navigation camera telescope (ONC-T) is a telescopic framing camera with seven colors onboard the Hayabusa2 spacecraft launched on December 3, 2014. The main objectives of this instrument are to optically navigate the spacecraft to asteroid Ryugu and to conduct multi-band mapping the asteroid. We conducted performance tests of the instrument before its installation on the spacecraft. We evaluated the dark current and bias level, obtained data on the dependency of the dark current on the temperature of the charge-coupled device (CCD). The bias level depends strongly on the temperature of the electronics package but only weakly on the CCD temperature. The dark-reference data, which is obtained simultaneously with observation data, can be used for estimation of the dark current and bias level. A long front hood is used for ONC-T to reduce the stray light at the expense of flatness in the peripheral area of the field of view (FOV). The central area in FOV has a flat sensitivity, and the limb darkening has been measured with an integrating sphere. The ONC-T has a wheel with seven bandpass filters and a panchromatic glass window. We measured the spectral sensitivity using an integrating sphere and obtained the sensitivity of all the pixels. We also measured the point-spread function using a star simulator. Measurement results indicate that the full width at half maximum is less than two pixels for all the bandpass filters and in the temperature range expected in the mission phase except for short periods of time during touchdowns.

Keywords

ONC Visible Multi-band imaging Asteroid Hayabusa2 Ryugu 

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • S. Kameda
    • 1
  • H. Suzuki
    • 2
  • T. Takamatsu
    • 1
  • Y. Cho
    • 1
  • T. Yasuda
    • 1
  • M. Yamada
    • 3
  • H. Sawada
    • 4
  • R. Honda
    • 5
  • T. Morota
    • 6
  • C. Honda
    • 7
  • M. Sato
    • 1
  • Y. Okumura
    • 1
  • K. Shibasaki
    • 1
  • S. Ikezawa
    • 1
  • S. Sugita
    • 8
  1. 1.Department of PhysicsRikkyo UniversityToshimaJapan
  2. 2.Department of PhysicsMeiji UniversityKawasakiJapan
  3. 3.Planetary Exploration Research CenterChiba Institute of TechnologyNarashinoJapan
  4. 4.Japan Aerospace Exploration AgencyJAXA Space Exploration Center, HAYABUSA2 ProjectSagamiharaJapan
  5. 5.Natural Sciences Cluster-Science UnitKochi UniversityKochiJapan
  6. 6.Graduate School of Environmental StudiesNagoya UniversityNagoyaJapan
  7. 7.Research Center for Advanced Information Science and TechnologyThe University of AizuAizuwakamatsuJapan
  8. 8.Department of Earth and Planetary Science, Graduate School of ScienceUniversity of TokyoBunkyo-kuJapan

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