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HD 164643


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A Note about the Comparison Between the Old and New Slettebak Systems of Axial Rotational Velocities
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1984RMxAA...9....9G&db_key=AST

Estimation of spectral classifications for bright southern stars with interesting Stromgren indices
This paper investigates the degree of success with which uvby photometrycan be applied to predict spectral classifications for 947 A, F, and Gstars brighter than an apparent magnitude of 8.3 and with four-colorindices indicating some kind of interesting, unusual, or peculiarspectrum. One or several possible spectral classifications are estimatedfor each star from photometry alone, double stars are distinguished, andthe estimates are compared with published classifications. The resultsshow that the framework provided by uvby photometry can be extended toinclude most G and K stars, reddened stars, peculiar stars, and certaintypes of double star.

Rotational velocities and spectral types for a sample of binary systems.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1975A&AS...19...91L&db_key=AST

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Observation and Astrometry data

Constellation:Πτηνόν
Right ascension:18h10m33.96s
Declination:-75°11'17.1"
Apparent magnitude:7.683
Distance:471.698 parsecs
Proper motion RA:6.3
Proper motion Dec:-11.8
B-T magnitude:7.641
V-T magnitude:7.68

Catalogs and designations:
Proper Names
HD 1989HD 164643
TYCHO-2 2000TYC 9445-2573-1
USNO-A2.0USNO-A2 0075-06037088
HIPHIP 89050
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