(Proposal ID) S10A-037

(PI) Yagi, Masafumi

(Proposal Title)
Slitless spectroscopy of small bodies on a dark cloud curtain

(Abstract)
We propose a slitless spectroscopy of minor bodies in the solar system of 
R < 23, which corresponds to > 0.2 - 0.7 km size at the main belt using 
Suprime-Cam and grism filters. The merit of slitless spectroscopy is that we 
can detect a minor body and take its spectrum in a single observation. We can 
therefore avoid the prior orbit determination, which made the spectroscopy of 
faint moving objects difficult. In our 2009A observation, we obtained 50 
spectra in a night. Our method to use a Galactic dark cloud to shade 
extragalactic objects is also proven to be very effective. However, the S/N of 
the faint moving object are insufficient for type classification. We therefore 
propose to observe more than 50 spectra of R < 23 moving objects with S/N>10 
using 3 nights. The data is enough to make a statistical comparison of the 
spectroscopic type distribution of < 5km size MBAs with that of well-studied 
near earth objects. We also aim to obtain spectra of Jupiter and Neptune 
Trojans, and TNOs.