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HD 176763


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NGC 6738: Not a real open cluster
A photometric, astrometric and spectroscopic investigation of the poorlystudied open cluster NGC 6738 has been performed in order to ascertainits real nature. NGC 6738 is definitely not a physical stellar ensemble:photometry does not show a defined mean sequence, proper motions andradial velocities are randomly distributed, spectro-photometricparallaxes range between 10 and 1600 pc, and the apparent luminosityfunction is identical to that of the surrounding field. NGC 6738therefore appears to be an apparent concentration of a few bright starsprojected on patchy background absorption.

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Observation and Astrometry data

Constellation:わし座
Right ascension:19h01m22.23s
Declination:+11°56'11.6"
Apparent magnitude:8.399
Distance:154.321 parsecs
Proper motion RA:15.1
Proper motion Dec:-1
B-T magnitude:8.57
V-T magnitude:8.414

Catalogs and designations:
Proper Names
HD 1989HD 176763
TYCHO-2 2000TYC 1048-363-1
USNO-A2.0USNO-A2 0975-13891176
HIPHIP 93402

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