I/331 Absolute Proper motions Outside the Plane (APOP) (Qi+, 2015)
Absolute Proper motions Outside the Plane - APOP. A step towards the GSC2.4. Qi Z.X., Yu Y., Bucciasrelli B., Lattanzi M.G., Smart R.L., Spagna A., McLean B.J., Tang Z.H., Jones H.R.A., Morbidelli R., Nicastro L., Vacchiato A. <Astron. J., 150, 137 (2015)> =2015AJ....150..137Q =2015yCat.1331....0Q
ADC_Keywords: Positional data ; Surveys ; Proper motions Keywords: astrometry - astronomical databases: miscellaneous - catalogs - proper motions - reference systems Abstract: We present a new catalog of absolute proper motions and updated positions derived from the same Space Telescope Science Institute digitized Schmidt survey plates utilized for the construction of the Guide Star Catalog II. As special attention was devoted to the absolutization process and removal of position, magnitude and color dependent systematic errors through the use of both stars and galaxies, this release is solely based on plate data outside the galactic plane, i.e. |b|≥27°. The resulting global zero point error is less than 0.6 mas/yr, and the precision better than 4.0mas/yr for objects brighter than RF=18.5, rising to 9.0mas/yr for objects with magnitude in the range 18.5<RF<20.0. The catalog covers 22,525 square degrees and lists 100,774,153 objects to the limiting magnitude of RF∼20.8. Alignment with the International Celestial Reference System (ICRS) was made using 1288 objects common to the second realization of the International Celestial Reference Frame (ICRF2) at radio wavelengths. As a result, the coordinate axes realized by our astrometric data are believed to be aligned with the extragalactic radio frame to within ±0.2mas at the reference epoch J2000.0. This makes our compilation one of the deepest and densest ICRF-registered astrometric catalogs outside the galactic plane. Although the Gaia mission is poised to set the new standard in catalog astronomy and will in many ways supersede this catalog, the methods and procedures reported here will prove useful to remove astrometric magnitude- and color-dependent systematic errors from the next generation of ground-based surveys reaching significantly deeper than the Gaia catalog. Description: The APOP is a absolute proper motion catalog achieved on the Digitized Sky Survey Schmidt plates data established by GSC-II project that outside the galactic plane (|b|>27°). The sky cover of this catalog is 22,525 square degree, the mean density is 4473 objects/sq.deg. and the magnitude limit is around R=20.8mag. The systematic errors of absolute proper motions related to the position, magnitude and color are practically all removed by using the extragalactic objects. The zero point error of absolute proper motions is less than 0.6mas/yr, and the accuracy is better than 4.0mas/yr for objects bright than R=18.5, and rises to 9.0mas/yr for objects with magnitude 18.5<R<20.0. We believe the catalog is reliable for operational applications and will be also fine for astrophysical research. But the user should use this catalog with that in mind, the accuracy condition is good for objects with Declination>-30 degree and is not very well for others, the reason is that the epoch difference is large for Declination>-30° (45 years) but South than that is only around 12 years. It is fine for statistical studies for objects with Declination←30° that people could find and remove obviously incorrect entries. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file apop.sam 156 100 *Absolute Proper motions Outside the Plane
Note on apop.sam: The reading format when using Fortran is '(A13,1X,I3,1X,2F12.7,1X,2F7.1,1X,2F8.1, 1X,2F6.1,1X,I3,1X,F7.3,1X,7F8.3)'.
See also: http://gsss.stsci.edu/catalogs/gsc/gsc2/gsc2.htm : the GSC-II Home Page I/254 : The HST Guide Star Catalog, Version 1.2 (Lasker+ 1996) I/271 : The Guide Star Catalog, Version 2.2 (GSC2.2) (STScI, 2001) I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006) Byte-by-byte Description of file: apop.sam
Bytes Format Units Label Explanations
1- 13 A13 --- ID Source identifier (1) 17 A1 --- Type Classification of the source (2) 20- 30 F11.7 deg RAdeg Right ascension (ICRS, position epoch=J2000.0, TDB) 32- 42 F11.7 deg DEdeg Declination (ICRS, position epoch=J2000.0, TDB) 45- 51 F7.2 mas e_RAdeg Error in right ascension at Epoch 52- 58 F7.2 mas e_DEdeg Error in declination at Epoch 59- 66 F8.1 mas/yr pmRA Absolute proper motion in RA (pmRA*cos(DE)) 68- 74 F7.1 mas/yr pmDE Absolute proper motion in Declination 76- 81 F6.1 mas/yr e_pmRA Error in pmRA at Epoch 83- 87 F5.1 mas/yr e_pmDE Error in pmDE at Epoch 89- 91 I3 --- Nobs Number of observations (3) 94- 99 F6.3 yr Dt Maximal time differences (4) 102-108 F7.3 mag Rmag ?=-99 Magnitude in RF photographic band (red) (5) 110-116 F7.3 mag Bmag ?=-99 Magnitude in BJ photographic band (blue) (5) 118-124 F7.3 mag Nmag ?=-99 Magnitude in IN photographic band (near infrared) (5) 126-132 F7.3 mag Vmag ?=-99 Magnitude in V photographic band (visible) (5) 134-140 F7.3 mag Jmag ?=-99 2MASS J magnitude (6) 142-148 F7.3 mag Hmag ?=-99 2MASS H magnitude (6) 150-156 F7.3 mag Kmag ?=-99 2MASS Ks magnitude(6)
Note (1): The ID is the source identifier for object in the APOP, which is as same as the source identifier of that object in GSC2.3 catalog. Here the APOP ID is the combination of the HTM_ID and the running_number in GSC2.3, i.e. 32768+0000005 for GSC2.3=S000000005, HTM6=S0000000 source, 32785+0003424 fpr GSC2.3=S00H003424, HTM6=S0000101 source in GSC2.3 (Cat. I/305). Note (2): The classification is based on the following codes: 0 = star as defined in the GSC23 1 = stars from the GSC23 used as reference sources 2 = QSOs from the GIQC catalog 3 = Non-stars as defined in the GSC23 4 = Non-stars indicated as extragalactic from Non-stars Note (3): The Nobs is the number of plates used for deriving the pmRA, pmDE of that object. Note (4): The Dt is the maximal time differences between the plates used for the calculation. Note (5): The magnitudes data are extracted directly from GSC2.3 catalog. Users can identify the exact meaning by looking at the 'Table 3' in GSC2.3 paper (Lasker et al., 2008AJ....136..735L, Cat. I/305). The default value is -99.000 if there is no data in that passband. Note (6): The photometric data are the near-infrared J (1.25um), H (1.65um), and Ks (2.16um) from the 2MASS catalog (Skrutskie et al., 2006AJ....131.1163S, Cat. VII/233). The default value is -99.000 if there is no data in that passband.
Acknowledgements: This work is a joint study of the Shanghai Astronomical Observatory (SHAO), the Osservatorio Astrofisico di Torino (OATo) and the Space Telescope Science Institute (STScI). We would like to express our thanks to many former and present members of the GSC project for their support and effort for this large project. This work is supported by grants from the National Science Foundation of China (NSFC No. 10903022) and the IPERCOOL FP7 International Research Staff Exchange Scheme (No. 247593). This research has made use of the MCS database server system, developed by Giorgio Calderone and Luciano Nicastro, operated at OATo and SHAO. Author's address: Zhaoxiang Qi, kevin(at)shao.ac.cn
(End) Zhaoxiang Qi [SHAO/CAS, China] 09-Sep-2015
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