New ultra-cool dwarfs from SDSS and 2MASS (Zhang+, 2009)
SDSS and 2MASS photometry of 129 ultra-cool dwarf candidates. The photometric data are from the seventh Data Release of the SDSS Photometric and the 2MASS All-Sky Catalog of Point Sources. Proper motions are found by dividing the difference between the 2MASS and SDSS coordinates by the observational epoch difference. Spectral types are based on the
Zhang, Z. H. et al.
Fecha de publicación:
4
2009