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J/A+A/375/308  Extension of ICRF for selected areas down to V=15 (Camargo+ 2001)

Extension of the ICRF for selected areas down to the 15th V magnitude Camargo J.I.B., Teixeira R., Benevides-Soares P., Ducourant C. <Astron. Astrophys., 375, 308-318 (2001)> =2001A&A...375..308C
ADC_Keywords: Positional data ; Proper motions Keywords: astrometry Description: A catalogue of accurate positions and proper motions for 41,721 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). Positions and proper motions were derived by combining current epoch positions, obtained with the Valinhos CCD meridian circle (VMC, see 1999A&AS..134..173V), with first epoch catalogues, AC2000 (I/247) and USNO-A2.0 (I/252) mainly, as well as positions from plate measurements performed with the MAMA measuring machine (Guibert J., Charvin P. & Stoclet P., 1983, in Proceedings of the 78th Colloquium of the IAU), in Paris. On average, objects with V≤14.0 have positional precisions better than 50mas in both coordinates, and 100mas near the detection limit of the VMC (V∼16,0). For proper motions, average precisions are better than 4mas/year, whatever the magnitude, when delta≥-17°. To the south of this declination, a magnitude dependence is verified due to a particular feature of the USNO-A2.0's epochs, providing figures of 3mas/year when V≤12.0, where the participation of AC2000 is noted, and reaching 17mas/year at the detection limit. The catalogue data is grouped by area, following the same order and identification as given in table 2 of the paper; within each area, objects are sorted by right ascension. The respective record numbers for the beginning of each area are provided in a separate table. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file vmcc.dat 138 41721 Valinhos meridian circle catalogue regions.dat 28 51 Region identifications (Table 2 of the paper) with record numbers in vmcc.dat
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) I/247 : The AC2000 Catalogue (Urban+ 1997) I/251 : VLBI International Celestial Reference Frame (ICRF) (Ma+, 1997) I/252 : The USNO-A2.0 Catalogue (Monet+ 1998) I/259 : The Tycho-2 Catalogue (Hog+ 2000) Byte-by-byte Description of file: vmcc.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Right Ascension J2000 (hours), at epoch EpRA 4- 5 I2 min RAm Right Ascension J2000 (minutes) 7- 12 F6.3 s RAs Right Ascension J2000 (seconds) 14 A1 --- DE- Declination J2000 (sign) 15- 16 I2 deg DEd Declination J2000 (degrees), at epoch EpDE 18- 19 I2 arcmin DEm Declination J2000 (minutes) 21- 25 F5.2 arcsec DEs Declination J2000 (seconds) 27- 30 I4 mas/yr pmRA Proper motion in R.A.*cos(dec) (J2000) 32- 35 I4 mas/yr pmDE Proper motion in D.E. (J2000) 37- 40 F4.1 mag Vmag V magnitude as obtained from the VMC 42- 49 F8.3 yr EpRA R.A. epoch 51- 58 F8.3 yr EpDE D.E. epoch 60- 62 I3 mas e_RAs Positional error in R.A.*cos(dec) for EpRA 64- 66 I3 mas e_DEs Positional error in D.E. for EpDE 68- 69 I2 mas/yr e_pmRA Proper motion error in R.A.*cos(dec) 71- 72 I2 mas/yr e_pmDE Proper motion error in D.E. 74- 80 I7 --- HIP ?HIPPARCOS (I/239) Catalogue number 82- 93 A12 --- TYC ?Tycho-2 number (see Note (1) in I/259) 94 A1 --- f_TYC [ *] presence in Tycho-1 catalogue (1) 97-105 I9 --- AC2000 ? AC2000 (I/247) number 108-114 I7 --- ACRS ? ACRS (I/171) number 116-124 A9 --- DM ? Durchmusterung (BD/CD/CPD) number 126-131 I6 --- SAO ? SAO (I/131) number 133-138 I6 --- HD ? HD (III/135) number
Note (1): '*' = Object not present in Tycho-1 catalogue (I/239). ' ' = Object present in Tycho-1 catalogue.
Byte-by-byte Description of file: regions.dat
Bytes Format Units Label Explanations
2- 6 I5 --- RecNo Record number of first record in vmcc.dat file 8- 28 A21 --- Region Region name as in Table 2 of the paper
Acknowledgements: Julio Ignacio Bueno de Camargo
(End) J.I.B. de Camargo [Univ. Sao Paulo] 25-Jul-2001
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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