The Hayabusa Spacecraft Asteroid Multi-Band Imaging Camera: AMICA

Details The Hayabusa Spacecraft Asteroid Multi-Band Imaging Camera: AMICA The Hayabusa Spacecraft Asteroid Multi-Band Imaging Camera: AMICA

2009-12-24

arxiv.org/abs/0912.4797v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

107 pages, 22 figures, 9 tables. will appear in Icarus

Scientific paper

The Hayabusa Spacecraft Asteroid Multiband Imaging Camera (AMICA) has acquired more than 1400 multispectral and high-resolution images of its target asteroid, 25143 Itokawa, since late August 2005. In this paper, we summarize the design and performance of AMICA. In addition, we describe the calibration methods, assumptions, and models, based on measurements. Major calibration steps include corrections for linearity and modeling and subtraction of bias, dark current, read-out smear, and pixel-to-pixel responsivity variations. AMICA v-band data were calibrated to radiance using in-flight stellar observations. The other band data were calibrated to reflectance by comparing them to ground-based observations to avoid the uncertainty of the solar irradiation in those bands. We found that the AMICA signal was linear with respect to the input signal to an accuracy of << 1% when the signal level was < 3800 DN. We verified that the absolute radiance calibration of the AMICA v-band (0.55 micron) was accurate to 4% or less, the accuracy of the disk-integrated spectra with respect to the AMICA v-band was about 1%, and the pixel-to-pixel responsivity (flatfield) variation was 3% or less. The uncertainty in background zero-level was 5 DN. From wide-band observations of star clusters, we found that the AMICA optics have an effective focal length of 120.80 \pm 0.03 mm, yielding a field-of-view (FOV) of 5.83 deg x 5.69 deg. The resulting geometric distortion model was accurate to within a third of a pixel. We demonstrated an image-restoration technique using the point-spread functions of stars, and confirmed that the technique functions well in all loss-less images. An artifact not corrected by this calibration is scattered light associated with bright disks in the FOV.

Affiliated with

Also associated with

No associations

Rating

The Hayabusa Spacecraft Asteroid Multi-Band Imaging Camera: AMICA does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Hayabusa Spacecraft Asteroid Multi-Band Imaging Camera: AMICA, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Hayabusa Spacecraft Asteroid Multi-Band Imaging Camera: AMICA will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-555177