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I/331 Absolute Proper motions Outside the Plane (APOP) (Qi+, 2015)
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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
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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|>=27deg. 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 R_F_=18.5, rising to 9.0mas/yr for objects
with magnitude in the range 18.5<R_F_<20.0. The catalog covers 22,525
square degrees and lists 100,774,153 objects to the limiting magnitude
of R_F_ 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|>27deg). 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>-30deg (45 years) but South than that is only around 12
years. It is fine for statistical studies for objects with
Declination<-30deg that people could find and remove obviously
incorrect entries.