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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: | Aigle |
| Right ascension: | 19h01m22.90s |
| Declination: | +11°36'24.9" |
| Apparent magnitude: | 9.087 |
| Proper motion RA: | 20 |
| Proper motion Dec: | 10.1 |
| B-T magnitude: | 9.502 |
| V-T magnitude: | 9.122 |
Catalogs and designations:
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