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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: | Αετός |
| Right ascension: | 19h01m26.97s |
| Declination: | +11°47'21.7" |
| Apparent magnitude: | 10.62 |
| Proper motion RA: | 0.7 |
| Proper motion Dec: | -5.4 |
| B-T magnitude: | 10.726 |
| V-T magnitude: | 10.629 |
Catalogs and designations:
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