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J/A+A/409/361 Extension of ICRF for selected areas down to V=16 (Camargo+, 2003)

Extension of the ICRF for selected areas down to the 16th magnitude - II. Camargo J.I.B., Ducourant C., Teixeira R., Le Campion J.-F., Rapaport M., Benevides-Soares P. <Astron. Astrophys. 409, 361 (2003)> =2003A&A...409..361C
ADC_Keywords: Positional data ; Proper motions ; Photometry Keywords: astrometry - reference systems Description: A catalogue of accurate positions and proper motions for 678,828 objects is provided. Objects are within areas of special astronomical interest, containing extragalactic radio sources, mostly from ICRF (see Cat. I/251), and pre-main-sequence (PMS) stars in Southern star-forming regions (Chamaeleon, Lupus and Upper Scorpius-Ophiuchus). This work represents a major upgrade of that presented in Camargo et al., 2001, Cat. J/A+A/375/308, aiming at the extension of the ICRF at optical wavelengths in regions of special astronomical interest, using observations from the Bordeaux and Valinhos meridian circles. Along with the new fields, the main differences, when compared to the first release, are: a much larger sky coverage, the replacement of the AC2000 by its upgraded version AC2000.2 (I/275) as one of the first epoch astrometrical sources, inclusion of Tycho-2 (I/259) and 2MASS (2nd Incremental Data Release, See Cat II/246) photometry when available, and the correction for a magnitude equation on the Valinhos right ascension system as well. Positional external precisions, on both coordinates, range from 50-60mas (V≤13.5) to 70-140mas (13.5<V≤16.0). For the proper motions, precisions range from 3mas/year to about 15mas/year, depending on magnitude and declination. The strips scanned by the meridian circles are described in Table 1 File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 172 546459 Bordeaux and Valinhos meridian circle catalogue table1.dat 81 242 Approximate central coordinates of the meridian strips
See also: J/A+A/375/308 : Extension of ICRF for selected areas for V≤15 (Camargo+ 2001) I/251 : VLBI International Celestial Reference Frame (ICRF) (Ma+, 1997) I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) I/259 : The Tycho-2 Catalogue (Hog+ 2000) I/275 : The AC 2000.2 Catalogue (Urban+ 2001) I/252 : The USNO-A2.0 Catalogue (Monet+ 1998) I/146 : Positions and Proper Motions - North (Roeser+, 1988) I/193 : Positions and Proper Motions - South (Bastian+ 1993) I/265 : Second Cape Photographic Catalogue (CPC2) (Zacharias+, 1999) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) http://ad.usno.navy.mil/tac/ : Twin Astrographic Catalog Version 2 Home Page Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Right Ascension (hours) ICRS, epoch EpRA-1900 4- 5 I2 min RAm Right Ascension (minutes) ICRS 7- 12 F6.3 s RAs Right Ascension (seconds) ICRS 14 A1 --- DE- Declination (sign) ICRS, epoch EpDE-1900 15- 16 I2 deg DEd Declination (degrees) ICRS, epoch EpDE-1900 18- 19 I2 arcmin DEm Declination (minutes) ICRS 21- 25 F5.2 arcsec DEs Declination (seconds) ICRS 27- 30 I4 mas/yr pmRA Proper motion mu_alpha*cos(dec) ICRS 32- 35 I4 mas/yr pmDE Proper motion mu_delta ICRS 38- 42 F5.2 mag VmagC V magnitude as obtained from BMC (Bordeaux) or VMC (Valinhos) 45- 51 F7.3 mag BTmag ? B magnitude as obtained from the Tycho-2 52- 58 F7.3 mag VTmag ? V magnitude as obtained from the Tycho-2 60- 66 F7.3 mag Jmag ?=-99.999 J magnitude from the 2MASS (1) 68- 74 F7.3 mag Hmag ?=-99.999 H magnitude from the 2MASS (1) 76- 82 F7.3 mag Kmag ?=-99.999 K magnitude from the 2MASS (1) 87- 92 F6.3 yr EpRA-1900 RA epoch minus 1900 96-101 F6.3 yr EpDE-1900 DE epoch minus 1900 104-110 F7.3 yr DT Largest time interval for proper motion determination 114-115 I2 mas e_RAs Standard error in RA*cos(dec) for EpRA 118-119 I2 mas e_DEs Standard error in DE for EpDE 121-122 I2 mas/yr e_pmRA Standard error in pmRA 124-125 I2 mas/yr e_pmDE Standard error in pmDE 130-131 I2 --- Nobs Number of meridian observations 134-139 I6 --- HIP ? HIPPARCOS (Cat. I/239) Catalogue number 141-152 A12 --- TYC ? Tycho-2 number (see Note (1) in I/259) 153 A1 --- f_TYC [*] Presence in Tycho-1 catalogue (2) 158-164 I7 --- AC2000.2 ? AC2000.2 (Cat. I/275) number 166 A1 --- C1 [BV] Current epoch catalogue: [B]ordeaux or [V]alinhos (3) 167 A1 --- C2 [A] A: use of AC2000.2 data, Cat. I/275 168 A1 --- C3 [U] U: use of USNO-A2.0 data, Cat. I/252 169 A1 --- C4 [P] P: use of PPM data, PPM North I/146, PPN South I/1993 170 A1 --- C5 [T] T: use of TAC-2 data, Zacharias & Zacharias, 1999AJ....118.2503Z 171 A1 --- C6 [C] C: use of CPC-2 data, Cat. I/265 172 A1 --- C7 [E] ESO plate measurements (4)
Note (1): 2MASS 2nd Incremental Data Release Note (2): Presence in Tycho-1 catalogue: '*' = Object not present in Tycho-1 catalogue (Cat. I/239) ' ' = Object present in Tycho-1 catalogue Note (3): Example: The character sequence "V U E" indicates that proper motion and mean position for a given star was obtained from the Valinhos meridian circle, USNO-A2.0 and ESO plates Note (4): Measured with the MAMA measuring machine
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1 A1 --- Zone [VB] V: Valinhos zones, B: Bordeaux zones 3- 23 A21 --- TARG ICRF name or other identifier of the target object 28- 32 I5 --- Nobj Total number of selected objects in the region: 3 or more observations in each coordinate with σRA*cos(DE) and σDE≤250mas 36- 38 I3 mas DaCd Mean, in units of milliarcseconds in RA*cos(DE), for the positional precision in RA of the objects computed in the column (Nobj) 40- 42 I3 mas Dd Mean, in units of milliarcseconds, for the positional precision in DE for the objects computed in the column (Nobj) 46- 47 I2 h RAh Approximate strip central right ascension (J2000) (5) 49- 50 I2 min RAm Approximate strip central right ascension (J2000) (5) 52- 55 F4.1 s RAs Approximate strip central right ascension (J2000) (5) 57 A1 --- DE- Approximate strip central declination (J2000) (5) 58- 59 I2 deg DEd Approximate strip central declination (J2000) (5) 61- 62 I2 arcmin DEm Approximate strip central declination (J2000) (5) 64- 65 I2 arcsec DEs Approximate strip central declination (J2000) (5) 72- 75 F4.1 mag Vmag ? V magnitude as given in the ICRF (Cat. I/251) 79- 80 I2 --- Nobs ? Number of observations of the target region
Note (5): Zones dimensions are typically 28' in declination and 80min in right ascension to the Bordeaux meridian circle strips and 13' in declination and 40min in right ascension to the Valinhos meridian circle strips.
Acknowledgements: Julio Camargo
(End) Patricia Bauer [CDS] 13-Oct-2003
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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