M. Honda, University of Tokyo, and colleagues (T. Yamashita, H. Kataza, T. Miyata, T. Fujiyoshi, S. Sako, Y. K. Okamoto, T. Onaka, T. Sekiguchi, D. Kinoshita, and J. Watanabe) report on mid- infrared observations of two comets with the 8.2-m Subaru Telescope (+ COMICS). N/Q-band imaging of C/2002 V1 on Jan. 11.2 UT yield the following total fluxes within a 2".73-box aperture: 8.8 microns, 0.83 +/- 0.01 Jy; 11.7 microns, 1.55 +/- 0.02 Jy; 12.4 microns, 1.95 +/- 0.04 Jy; 18.8 microns, 2.79 +/- 0.06 Jy. Low- resolution (250) N-band spectroscopic observations (range 8-13 microns) of C/2002 V1 showed a broad amorphous silicate feature with a 11.2-micron local peak, indicating the presence of crystalline olivine. Total fluxes for C/2001 RX_14 on Jan. 11.6 (measured as above): 8.8 microns, 0.066 +/- 0.004 Jy; 12.4 microns, 0.279 +/- 0.016 Jy; 18.8 microns, 0.356 +/- 0.022 Jy. Low- resolution N-band spectroscopy of C/2001 RX_14 showed the possible shallow silicate feature, but no 11.2-micron local peak was found within the error bars.
International Astronomical Union Circular
- Pub Date:
- January 2003