银河系巡天

光谱

中分辨率

• RAVE

南天，Ｉ<12等，R~5000,1.2m 望远镜，已经完成，大概50万颗星

搞分辨率

• H3 Spectroscopic Survey [ arXiv:1907.07684 | h3survey.rc.fas.harvard.edu]

spectrophotometric distances for 200,000 stars to r=18.

Hectochelle instrument at the MMT,resolution R~23,000 spectra covering the wavelength range 5150A-5300A.

The survey is optimized for stellar halo science and therefore focuses on high Galactic latitude fields (|b|>30 deg.), sparsely sampling 15,000 sq. degrees.