... Piotrovich Main Astronomical Observatory, Pulkovo, St. Petersburg, Russia Received May 24, 2006; in final form, July 7, 2006 Abstract--We have used two astrometric methods developed at the Main Astronomical Observatory of the Russian Academy of Sciences--the method of apparent-motion parameters (AMP) and a direct geometrical method (DGM)--to derive the orbit of the star S2 around the Galactic center, and thereby the mass of the supermassive black hole at the Galactic center. ... Relative positions. ...

... A:link {color: # 0000BF } A:visited {color: # 0000BF } A:active {color: # 0000BF } A:hover {color: #FF0000} -- /style /style !--#config timefmt= %e -- !--#set var = DATE value = $DATE_LOCAL -- !--#config timefmt= %m -- !--#set var = NUM_MONTH value = $DATE_LOCAL -- !--#config timefmt= %G -- !--#set var = YEAR ...

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