![]() ![]() The parallax and radial velocity will have a very Upon output to contain the values of these quantities in theī1950 system. The values of MU_RADEC, PARALLAX, and RADVEL will all be modified RAD_VEL - N_element vector giving radial velocity in km/s PARALLAX - N_element vector giving stellar parallax (seconds of arc) OPTIONAL INPUT-OUTPUT KEYWORDS MU_RADEC - 2xN element double precision vector containing the proper motion in seconds of arc per tropical century in right Scalar or N element vector OUTPUTS: RA_1950, DEC_1950 - The corresponding B1950 right ascension and declination in degrees. CALLING SEQUENCE: bprecess, ra, dec, ra_1950, dec_1950, INPUTS: RA,DEC - Input J2000 right ascension and declination in degrees. The mean place at J2000.0 on the FK5 system. ![]() bprecess ( ra0, dec0, mu_radec=None, parallax=None, rad_vel=None, epoch=None ) ¶ NAME: BPRECESS PURPOSE: Precess positions from J2000.0 (FK5) to B1950.0 (FK4) EXPLANATION: Calculates the mean place of a star at B1950.0 on the FK4 system from Landsman September 1997ĭocumentation update W. Landsman, Cleaned up program sent by Chris McCarthy (SfSU) June 1994Ĭonverted to IDL V5.0 W. Vb*cos(dec)*sin(ra) + vb*sin(dec) REVISION HISTORY: Jeff Valenti, U.C. ![]()
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