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HD 1428


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The Hyades supercluster in the FK5
The members of the Hyades supercluster brighter than about M(V) = + 4mag and contained in the FK5, or having nearly FK5 quality propermotions, show a convergent point of (A,D) = (6h, + 6.5 deg). The Hyadescluster stars in the FK5 have a mean distance of 46.7 pc. Thesupercluster, as well as the Hyades and Praesepe cluster, populationsrepresent at least three age groups. Standard models indicate ages of 3to 4, 6, and 8 x 10 exp 8 yr, whereas model ages with convectiveovershoot are nearly twice this. Most of the Am and USPC stars in thesupercluster are of the same age. The Ap stars mark the onset of shellhydrogen burning. The photometry of the red giants confirms the agespread and indicates a weakening of CN strength with age. Attention iscalled to the need for further study of NGC 2423 as an effectiveprolusion to understanding the evolution of the supercluster.

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Observation and Astrometry data

Constellation:Andromeda
Right ascension:00h18m36.32s
Declination:+35°59'23.9"
Apparent magnitude:7.76
Distance:425.532 parsecs
Proper motion RA:-3.9
Proper motion Dec:-6.1
B-T magnitude:9.49
V-T magnitude:7.903

Catalogs and designations:
Proper Names
HD 1989HD 1428
TYCHO-2 2000TYC 2273-2019-1
USNO-A2.0USNO-A2 1200-00147952
HIPHIP 1492

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