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HD 180420


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A spectroscopic and photometric study of the giant star HD 101841: A very short-period binary system
The giant star HD 101841 is a single lined spectroscopic binary with anorbital period of 3.11 days and an assumed circular orbit. No sign ofhydrogen alpha emission or significant Li I 6707.81 A features werefound. Photometric observations show a micro-variability of about 0.014magnitude in V. Different studies give a F3II spectral classificationbut we found strong evidences that HD 101841 is probably a F3III-IVgiant star.

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Observation and Astrometry data

Constellation:Sagittarius
Right ascension:19h17m55.74s
Declination:-34°31'10.2"
Apparent magnitude:8.303
Distance:222.222 parsecs
Proper motion RA:-1.9
Proper motion Dec:-6.8
B-T magnitude:8.726
V-T magnitude:8.338

Catalogs and designations:
Proper Names
HD 1989HD 180420
TYCHO-2 2000TYC 7431-827-1
USNO-A2.0USNO-A2 0525-40385477
HIPHIP 94844

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