I/226 Vatican AC Zone Data Reduced to ACRS (Urban+ 1996) ================================================================================ Vatican AC Zone Data Reduced to ACRS Urban S.E., Jackson E.S., Corbin T.E. ================================================================================ ADC_Keywords: Astrographic zones ; Positional data ; Historical catalog ; Photographic catalog ; Regional catalog ; Surveys ; Cross identifications Abstract: The U.S. Naval Observatory is in the process of making new reductions of the Astrographic Catalogue (AC) using a modern reference system, the ACRS, which represents the system of the FK5. The data from the Vatican Zone, whose plates are centered between declinations +55 and +64 degrees (eq. 1900), have been analyzed for scale, rotation, tilt, coma, magnitude equation, radial distortion and distortions introduced by the use of reseaux in the Carte du Ciel program. The result is a positional catalog of over 256,000 stars on eq. J2000.0, epoch of observation. Additionally, all stars have been matched with the Tycho Input Catalog (revised); those numbers have been added for additional identification purposes. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file vatac.dat 97 256212 Vatican AC stars reduced using ACRS notes 135 579 Notes on the AC/Tycho matches -------------------------------------------------------------------------------- See also: I/171 : the Astrographic Catalog Reference Stars (ACRS, Corbin et al., 1991) I/197 : Tycho Input Catalogue, Revised version (TIC, Egret et al., 1992) I/219 : Cape AC Zone (-41 to -51) Reduced to ACRS (Urban & Corbin, 1995) I/222 : San Fernando AC Zone (-3 to -9) Reduced to ACRS (Urban et al., 1995) I/223 : Algiers AC Zone (+04 to -02) Reduced to ACRS (Urban et al., 1995) I/224 : Oxford 1 AC Zone (+25 to +31) Reduced to ACRS (Urban et al., 1996) I/225 : Oxford 2 AC Zone (+32 to +33) Reduced to ACRS (Urban et al., 1996) I/227 : Paris AC Zone (+18 to +24) Reduced to ACRS (Urban et al., 1996) I/228 : Bordeaux AC Zone (+11 to +17) Reduced to ACRS (Urban et al., 1996) I/231 : Uccle AC Zone (+05 to +11) Reduced to ACRS (Urban et al., 1996) I/232 : Toulouse AC Zone (+34 to +35) Reduced to ACRS (Urban et al., 1996) Byte-by-byte Description of file: vatac.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 h RAh Right Ascension J2000.0 (hours) 4- 5 I2 min RAm Right Ascension J2000.0 (minutes) 7-12 F6.3 s RAs Right Ascension J2000.0 (seconds) 14 A1 --- DE- [+] Declination J2000.0 (sign) 15-16 I2 deg DEd [53-65] Declination J2000.0 (degrees) 18-19 I2 arcmin DEm Declination J2000.0 (minutes) 21-25 F5.2 arcsec DEs Declination J2000.0 (seconds) 28-32 F5.2 mag B(mag) Magnitude from image diameter 34-41 F8.3 yr EpRA Mean epoch of position, RA 43-50 F8.3 yr EpDE Mean epoch of position, Dec 51-52 I2 --- Num Number of images used 53-58 F6.3 arcsec e_RAs ?Standard deviation of mean (RA) 59-64 F6.3 arcsec e_DEs ?Standard deviation of mean (Dec) 66-73 I8 --- ISN *Internal Star Number ID 75-82 I8 --- ACRS ?ACRS number 84-92 I9 --- TICr ?Tycho Input Catalog (rev) number 94-97 I4 --- NoteID *[1/531]? Note detailed in file notes ------------------------------------------------------------------------------- Note on ISN: The Internal Star Number, ISN, is used in the reduction process to identify all images of the same star that may appear on different plates. This is generated at U.S. Naval Observatory (USNO) and added on to the original x,y data. When the original data are released by USNO, this number can be used to link the original data to the final catalog. Note on NoteID: Detailed notes concerning possible errors in the AC/Tycho matches can be found in the file notes -------------------------------------------------------------------------------- Byte-by-byte Description of file: notes -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 --- NoteID [1/531]+= Number from vatac.dat file 5-135 A131 --- Note Footnote for this star -------------------------------------------------------------------------------- References: New Reductions of the Astrographic Catalogue: Plate Adjustments of the Algiers, Oxford I and II, and Vatican Zones, Urban, S.E, Martin, J.C., Jackson, E.S., and Corbin, T.E., Astronomy and Astrophysics Supp. Series, in press. New Reductions of the Astrographic Catalogue: Conventional Plate Adjustment of the Cape Zone, Urban S.E. and Corbin T.E. Astronomy and Astrophysics, 305 989 The U.S. Naval Observatory Astrographic Catalog Project, Urban, S.E. and Corbin, T.E., Galactic and Solar System Optical Astrometry, ed. Morrison and Gilmore, Camb. Univ. Press, p. 11, 1994} ================================================================================ (End) Sean E. Urban [U.S. Naval Observatory] 27-Feb-1996