Year: 2011
Type: article
Abstract: We present the fourth installment of the Yale/San Juan Southern Proper Motion Catalog, SPM4. The SPM4 contains absolute proper motions, celestial coordinates, and B , V photometry for over 103 million stars and galaxies between the south celestial pole and −20° declination. The catalog is roughly complete to V = 17.5 and is based on photographic and CCD observations taken with the Yale Southern Observatory's double astrograph at Cesco Observatory in El Leoncito, Argentina. The proper-motion precision, for well-measured stars, is estimated to be 2–3 mas yr −1 , depending on the type of second-epoch material. At the bright end, proper motions are on the International Celestial Reference System by way of Hipparcos Catalog stars, while the faint end is anchored to the inertial system using external galaxies. Systematic uncertainties in the absolute proper motions are on the order of 1 mas yr −1 .
Source: The Astronomical Journal
Authors: Terrence M. Girard, William F. van Altena, Norbert Zacharias, Katherine Vieira, Dana I. Casetti-Dinescu, Danilo Castillo, David Herrera, Young Sun Lee, Timothy C. Beers, David G. Monet, Carlos E. López
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2082144756