1146 I/146 Positions and Proper Motions S Roeser U Bastian Astron. Astrophys. Suppl. Ser. 74 449 1988 1988A&AS...74..449R Positional data Proper motions PPM North gives J2000 positions and proper motions of 181,731 stars north of -2.5 degrees declination. Its main purpose is to provide a convenient, dense, and accurate net of astrometric reference stars that represents the new IAU (1976) coordinate system on the sky. The mean epoch is near 1931. The average mean errors of the positions and proper motions are 0.27" and 0.43"/cen. On the average six measured positions are available per star; 1064 stars do not have sufficient redundancies to resolve discrepancies. In addition to the positions and proper motions, the PPM (North) contains the BD number, the magnitude, the spectral type, the number of positions included, the mean error of each component of the position and proper motion, the weighted mean epoch in each coordinate, the numbers in the SAO, HD, and AGK3 catalogs, and various standard notes. In addition a number of individual notes are given in the introduction. The PPM North consists of three files: a descriptive document supplied by the authors for more detail regarding the scope, construction, properties, and usage of PPM North; the data file for the PPM North itself; and a version of PPM North in the format of the preliminary PPM North. See author supplied description for more complete information.

PPM Designation of the star Designation of the star in PPM South starting with No. 181732, see chapter 3 of the author's description file. --- DM BD (zones -02 to -22), else CD Designation of the star in the Bonner Durchmusterung (for zones from -02 to -22 degrees) or in the Cordoba Durchmusterung (zones -23 to -89 degrees). --- mag Magnitude See chapter 3 of description file. mag Sp Spectral type --- RAh Right Ascension J2000 (hours) h RAm Right Ascension J2000 (minutes) min RAs Right Ascension J2000 (seconds) s DE- Declination J2000 (sign) --- DEd Declination J2000 (degrees) deg DEm Declination J2000 (minutes) arcmin DEs Declination J2000 (seconds) arcsec pmRA Proper motion in RA, J2000 Proper motion in right ascension fro epoch and equinox J2000.0, on the system of FK5 given in seconds of time per Julian year. s/yr pmDE Proper motion in DE, J2000 arcsec/yr N Number of individual published positions used Number of individual published positions used for the derivation of the position and proper motion given. --- e_RA Mean error of RA Mean error of right ascension at the mean epoch of right ascension, multiplied by the cosine of declination, given in units of #0.01 seconds of arc. 10mas e_DE Mean error of DE Mean error of declination at the mean epoch of declination, given in units of #0.01 seconds of arc. 10mas e_pmRA Mean error of pmRA Mean error of the proper motion in right ascension, multiplied by the cosine of declination, given in units of 0.001 seconds of arc per Julian year. mas/yr e_pmDE Mean error of pmDE mean error of the proper motion in declination given in units of 0.001 seconds of arc per Julian year mas/yr EpRA Weighted mean epoch, RA and pmRA Weighted mean epoch of the measured positions used for the derivation of RA and pmRA, given in years since 1900.0. yr EpDE Weighted mean epoch, DE and pmDE Weighted mean epoch of the measured positions used for the derivation of DE and pmDE, given in years since 1900.0. yr SAO SAO Designation --- HD Henry Draper Designation --- CPD Cape Photographic Durchmusterung Designation --- Flag1 'P' - problem, 'C' - comment P - problem case, preferably not to be used as astrometric reference star. C - a critical comment is given in the List of Critical Comments. Not to be used as astrometric reference star. --- Flag2 'D' - double star D - double star, preferably not to be used as astrometric reference star. --- Flag3 - not used Not used, void for consistency with PPM (north). --- Flag4 'F' - member of FK5 F - member of FK5, mostly bright stars, original FK5 data are given. --- Flag5 'R' - remark, 'V' - V mag (CPC-2) R - a remark is given in the List of Remarks on Individual Stars. V - the magnitude is a photographic V magnitude copied from CPC-2. --- cat The catalog prefix 'PPM' --- PPM Designation of the star --- mag Magnitude mag Sp Spectral type --- Flag1 Problem flag P - problem case, preferably not to be used as astrometric reference star. C - a critical comment is given in the List of Critical Comments. Not to be used as astrometric reference star. --- RA1950 RA equinox and epoch B1950, FK4 rad DE1950 DE equinox and epoch B1950, FK4 rad pmRA1950 Proper motion in RA, B1950, FK4 0.01rad/yr pmDE1950 Proper motion in DE, B1950, FK4 0.01rad/yr RA RA equinox and epoch J2000, FK5 rad DE DE equinox and epoch J2000, FK5 rad pmRA Proper motion in RA, J2000, FK5 0.01rad/yr pmDE Proper motion in DE, J2000, FK5 0.01rad/yr descrip.docAuthors' description Gail L. Schneider NSSDC/ADC 1994Nov14 I_146.xml