J/AJ/124/601 Absolute positions and proper motions in NGC 188 (Platais+, 2002)
WIYN Open Cluster Study.
VIII. The geometry and stability of the NOAO CCD Mosaic Imager
Platais I., Kozhurina-Platais V., Girard T.M., van Altena W.F.,
Klemola A.R., Stauffer J.R., Armandroff T.E., Mighell K.J., Dell'Antonio I.,
Falco E.E., Sarajedini A.
<Astron. J. 124, 601 (2002)>
=2002AJ....124..601P 2002AJ....124..601P
ADC_Keywords: Clusters, open ; Proper motions ; Photometry, UBV
Keywords: astrometry - catalogs - instrumentation: detectors -
open clusters and associations: individual (NGC 188)
Abstract:
The field of direct imaging is experiencing a considerable growth in
the number of available CCD mosaic imagers, especially on large
telescopes. To fully exploit the astrometric potential of these
imaging devices, we develop a technique, utilizing an astrometric
standard, for precision transformation of pixel coordinates into a
global coordinate system. We have constructed a new astrometric
standard set of 1863 stars in the field of NGC 188 to derive the CCD
chip constants for the NOAO CCD Mosaic Imager. The multiple-epoch data
on the Mosaic's metrics indicate that this CCD mosaic device may have
experienced a one-time nonelastic expansion. We also present a new
determination of the pixel scale and the optical field angle
distortion constants for the KPNO Mayall 4 m telescope prime focus
field corrector. To establish a reliable history of the CCD mosaic
imager metrics for current and potential future astrometric
applications, we recommend obtaining astrometric calibrations for CCD
mosaic imagers on a regular basis. Apart from mechanical positioning
of the CCD mosaic camera on the telescope, noticeable changes in the
thermal environment of CCD mosaic chips should also prompt new
astrometric calibrations. It is shown that, following all precautions,
the NOAO CCD Mosaic Imager can produce excellent astrometric results
on the Mayall 4 m telescope.
Description:
This file has not been included in the paper, although it was
instrumental in deriving the NOAO Mosaic Imager CCD chip constants and
distortion coefficients. The file contains an astrometric standard
around the open cluster NGC 188. It can serve as a medium depth (V=17)
astrometric standard and as a source of absolute proper motions. The
typical accuracy of proper motions is 1.5 to 2.0mas/yr for stars
brighter than V=14 and reaches 7.0mas/yr at the limiting magnitude.
The mean internal precision of the equatorial coordinates is 60 mas or
better. The precision of BV photographic photometry, calibrated using
the available photoelectric BV photometry, is 0.07mag in each
bandpass.
The astrometric standard around NGC 188 is based on twenty five
8x10 inch format plates taken with the Lick 51-cm double astrograph
(scale 55.1"/mm) located on Mt. Hamilton, California. The basic data
on this plate material are provided in Table 1, where the beginning
and the end of exposures are given either in Universal Time (UT) or
Local Siderial Time (LST) as listed on plate envelopes. In addition,
the photographic emulsion, filter and observer are also indicated.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
plates.dat 78 25 Plate material
ngc188.dat 64 1863 Catalog of positions, absolute proper motions and
BV photographic photometry in the region of
open cluster NGC 188
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See also:
J/AJ/122/1486 : NGC 2451A proper motions and membership (Platais+, 2001)
Byte-by-byte Description of file: plates.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- Plate Plate number (1)
9- 18 A10 "YYYY/MM/DD" ObsDate Observation date
21- 28 A8 "HH:MM:SS" ObsTime1 Time of beginning of the observation
29 A1 --- --- [-]
30- 37 A8 "HH:MM:SS" ObsTime2 Time of end of the observation
40- 42 A3 --- n_ObsTime1 UT or LST time of observation
45- 49 A5 --- Emul Emulsion
52- 56 A5 --- Filter Filter
59- 73 A15 --- Obs Observer's name
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Note (1): Only a selected sample of stars was measured on the plates.
All stars down to the plate limit have been measured within a circular
area with a 30' radius centered on RA=0h 44m 20s, DE=+85°19'(J2000).
In addition, a sample of Hipparcos and Tycho-2 stars were measured in
a larger 2x2° area having the same center. In the catalog the
Hipparcos and Tycho-2 stars can be identified as those having
identification numbers higher than 9800. (Some of them have duplicate
entries among the stars in the main body of the catalog.) The details
on plate measurements and reductions are given in the paper.
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Byte-by-byte Description of file: ngc188.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- ID Object identifier
6- 15 F10.8 rad RArad Right ascension for the epoch J2000 and in the
ICRS reference system (i.e. equinox J2000.0)
17- 26 F10.8 rad DErad Declination for the epoch J2000,
equinox J2000.0
28- 34 F7.1 mas/yr pmRA Absolute proper motion in right ascension
multiplied by cos(DE)
36- 42 F7.1 mas/yr pmDE Absolute proper motion in declination
44- 48 F5.2 mag Vmag Photographic V-magnitude
50- 54 F5.2 mag B-V Photographic B-V color
56- 58 F3.1 mas/yr e_pmRA Estimated standard error of proper motion
in one coordinate (mean of RA and DE)
60- 61 I2 --- n_RArad Number of plates used for a solution in
right ascension
63- 64 I2 --- n_DErad Number of plates used for a solution in
declination
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History:
Copied at http://www.astro.yale.edu/astrom
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(End) Patricia Bauer [CDS] 21-Jan-2002