We collected a large data set of field RR Lyrae stars (RRLs) by using catalogs already available in the literature and Gaia DR2. We estimated the iron abundances for a subsample of 2382 fundamental RRLs (∆S method: Ca II K, Hβ, Hγ, and Hδ lines) for which there are publicly available medium-resolution SDSS-SEGUE spectra. We also included similar

PUMA is a proposed ultra-wideband low-resolution interferometric transit radio telescope operating at 200-1100 MHz composed of thousands of 6m dishes. It is optimized for intensity mapping of the redshifted 21cm line over z=0.3-6 to study dark energy and inflation. The same design also allows an unprecedented study of fast radio bursts and pulsars.

PolStar is an Explorer-class far ultraviolet (FUV) spectropolarimetry mission designed to target massive stars and their environments. PolStar will take advantage of resonance lines only available in the FUV to measure for the first time the magnetic and wind environment around massive stars to constrain models of rotation and mass loss.

Based on the observations by the optical navigation camera on the Hayabusa2 spacecraft, stronger 0.7-micron band absorption, which might attribute to hydrated minerals, was found on the pole regions of the C-type asteroid Ryugu. This could be because of less irradiation rate from the Sun.

In 2010 we started a spectroscopic survey to obtain visible and near-infrared spectra of primitive asteroids in the main belt. The main objective was to characterize the collisional families located in the inner part of the belt, and believed to be the origin of primitive near-Earth asteroids, in particular those that are the targets of two sample