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HD 23864


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High-precision positions and proper motions of 441 stars in the Pleiades astrometric standard region.
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Determination of the Proper Motions for Stars in the Region of the Pleiades - Part One
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The Pleiades cluster. III - Polarization, reddening, and the unusual distribution of interstellar matter
A polarization survey of Pleiades cluster members and nonmembers hasbeen carried out together with a determination of interstellar reddeningfor cluster members. The ISM in front of and inside the cluster leads tovariable polarization and reddening across the cluster. The optical datacorrelate well with available radio and millimeter features. Twodistinct ISM concentrations are isolated: (1) a uniform foreground sheetin front of the whole cluster which is seen as constant reddening andpolarization in the eastern part of the cluster; and (2) additionalintracluster material, located mainly in the western part of thecluster.

Lunar occultation summary. II
Results of a second series of 196 two-color photoelectric lunaroccultation observations made within the interval from May 1972 toDecember 1973 are reported. Each observation has been employed toestimate the minimum magnitude difference between the observed objectand possible undetected companions. The study contains the analyses of143 disappearances and 53 reappearances. Eighteen of these eventsmanifest some degree of multiplicity. Included in the study are 18occultation events for Pleiades members.

Accurate positions of 502 stars in the region of the Pleiades
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Photovisual magnitudes of the stars in the Pleiades.
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Observation and Astrometry data

Constellation:Taureau
Right ascension:03h49m12.15s
Declination:+23°24'30.0"
Apparent magnitude:9.487
Proper motion RA:-25.9
Proper motion Dec:25.4
B-T magnitude:10.048
V-T magnitude:9.534

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 23864
TYCHO-2 2000TYC 1800-696-1
USNO-A2.0USNO-A2 1125-01284384
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