J/A+AS/137/269 Calern Observatory absolute declinations (Martin+, 1999) ================================================================================ Absolute declinations with the photoelectric astrolabe at Calern Observatory (OCA) Martin V.A.F., Leister N.V., Vigouroux G., Furia M., Journet A. =1999A&AS..137..269M (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Positional data ; Fundamental catalog Keywords: astrometry - catalogues - reference system Abstract: A regular observational programme with a photoelectric astrolabe have been performed at ``Observatoire du Calern" (Observatoire de la Cote d'Azur, OCA, {phi}=+43{deg}44'55.011"; {lambda}=-0^h^27^m^42.44^s^, Calern, Caussols, France) for the last twenty years. It has been almost fully automatized between 1984 and 1987. Since 1988 the photoelectric astrolabe was used without any modification. In addition to determining the daily orientation of the local vertical, the yearly analysis of the residuals permits to derive corrections to the used star catalogue Vigouroux et al. (1992A&AS...96..477V). A global reduction method was applied for the ASPHO observations. The new form of the equations Martin & Leister (1997A&AS..126..169M) give us the possibility of using the entire set of the observing program using data taken at two zenith distances (30{deg} and 45{deg}). The program contains about 41648 stars' transits of 269 different stars taken at ``Observatoire du Calern" (OCA). The reduction was based on the HIPPARCOS system. We discuss the possibility of computing absolute declinations through stars belonging simultaneously to the 30{deg} and 45{deg} zenith distances programmes. The absolute declination corrections were determined for 185 stars with precision of 0.027" and the value of the determined equator correction is -0.018"+/-0.005". The instrumental effects were also determined. The mean epoch is 1995.29. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file catalog.dat 67 271 Absolute declinations -------------------------------------------------------------------------------- See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) Byte-by-byte Description of file: catalog.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 6 I6 --- HIP HIPPARCOS (Cat. ) star number 8- 11 F4.2 mag Vmag Visual magnitude 13- 16 F4.1 mag B-V B-V colour index 18- 19 I2 h RAh Right ascension (J2000.0) 21- 22 I2 min RAm Right ascension (J2000.0) 24- 29 F6.3 s RAs Right ascension (J2000.0) 31 A1 --- DE- Declination sign (J2000.0) 32- 33 I2 deg DEd Declination (J2000.0) 35- 36 I2 arcmin DEm Declination (J2000.0) 38- 42 F5.2 arcsec DEs Declination (J2000.0) 44- 46 I3 mas DRA Position correction of right ascension (DRAcosDE) 48- 49 I2 mas e_DRA rms uncertainty on DRA 51- 53 I3 mas DDE ? Position correction of absolute declination 55- 56 I2 mas e_DDE ? rms uncertainty on DDE 58- 67 F10.2 d HJD Heliocentric Julian Date of the observation -------------------------------------------------------------------------------- Acknowledgements: Vera Martin ================================================================================ (End) Patricia Bauer [CDS] 04-May-1999