J/A+AS/133/387 NGC 1817 and NGC 1807 proper motions (Balaguer-Nunnez+ 1998)
Determination of proper motions and membership of the
open clusters NGC 1817 and NGC 1807
Balaguer-Nunnez L., Tian K.P., Zhao J.L.
<Astron. Astrophys. Suppl. Ser. 133, 387 (1998)>
=1998A&AS..133..387B 1998A&AS..133..387B
ADC_Keywords: Clusters, open ; Proper motions
Keywords: open clusters and associations: individual: NGC 1817, NGC 1807 -
astrometry
Description:
Relative proper motions, their corresponding errors and membership
probabilities of 722 stars in the open cluster NGC 1817 region are
given. Equatorial coordinates were computed using Tycho Catalog
(Cat. I/239) as reference stars. Forty stars from this catalog are
in the region under study. The cross-identification of this 40 stars
are given as notes. Only 15 stars were found in this region from the
PPM Catalog (Cat. I/146), and their respective identification is
also included in the note5.dat file.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 112 722 Relative proper motions and membership probabilities
of 722 stars of NGC 1817 and NGC 1807
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/146 : Positions and Proper Motions - North (Roeser+, 1988)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq Sequential identification number
6- 12 F7.3 cm Xpos x-plate coordinate (towards East)
13- 19 F7.3 cm Ypos y-plate coordinate (towards North)
21- 22 I2 h RAh Right ascension (J2000)
24- 25 I2 min RAm Right ascension (J2000)
27- 32 F6.3 s RAs Right ascension (J2000)
34 A1 --- DE- Declination sign
35- 36 I2 deg DEd Declination (J2000)
38- 39 I2 arcmin DEm Declination (J2000)
40- 45 F6.2 arcsec DEs Declination (J2000)
47- 54 F8.3 mas/yr pmx Proper motion in x
56- 63 F8.3 mas/yr pmy Proper motion in y
65- 69 F5.3 mas/yr e_pmx error in PMx
71- 75 F5.3 mas/yr e_pmy error in PMy
78- 81 F4.2 --- Pngc1817 [0,1] Probability NGC 1817 cluster star
83- 86 F4.2 --- Pngc1807 [0,1] Probability NGC 1807 cluster star
88- 91 F4.2 --- Pfield [0,1] Probability Field star
93- 94 I2 --- W Number of plate pairs used
96-104 A9 --- TYC Tycho (Cat. I/239) number
107-112 I6 --- PPM ? PPM (Cat. I/146) number
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Acknowledgements: Lola Balaguer-Nunnez
History:
* 02-Jul-1998: Original version from author
* 07-Nov-2004: One TYC number corrected (Star #819, was TYC 1282-0501,
but coincides with TYC 1282-0541)
(End) Patricia Bauer [CDS] 02-Jul-1998