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HD 69609


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Photographic astrometry of binary and proper-motion stars.
In the study of dwarf star distances and of binary-star masses at the61-cm Swarthmore refractor, parallaxes of 69 stars and systems wereobtained by processing some 5000 astrometric plates from April 1988 toJuly 1989. These results are listed along with 11 binary-star massratios and three unresolved pairs.

The use of dwarf elliptical galaxies as distance indicators - The relative distances between Virgo, Fornax, and Centaurus
Photometric parameters derived from surface photometry of dwarfelliptical galaxies are used to determine the relative distance betweenthe Virgo, Fornax, and Centaurus clusters. The study uses a sample ofabout 25 dwarf elliptical galaxies in each cluster. With Virgo as thefiducial cluster, it is found that R(Fornax)/R(Virgo) = 0.93 + or - 0.07and R(Centaurus)/R(Virgo) = 1.91 + or - 0.07. The results are in goodagreement with those obtained by Aaronson et al. (1989) using the IRTully-Fisher relation.

Visual multiples. VIII - 1000 MK types
A total of 1000 new classifications are given for stars brighter than B= 8.0 mag in the Aitken double star catalog. The classificationssupplement 865 classifications obtained in 1981 and 1984. Among thenewly discovered stars are 12 new Ap stars, eight Lambda Bootis stars,one Ba II star, and 60 Am stars. A detailed list of the newclassifications is given.

Micrometer Observations of Double Stars and New Pairs - Part Ten
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980ApJS...44..111H&db_key=AST

Mesures d'étoiles doubles faites au réfracteur de 38 cm de l'Observatoire de Nice
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Сазвежђа:Хидра
Ректацензија:08h17m51.96s
Deклинација:+02°27'42.1"
Apparent магнитуда:8.045
Даљина:283.286 parsecs
Proper motion RA:-8.8
Proper motion Dec:-4.8
B-T magnitude:8.334
V-T magnitude:8.069

Каталог и designations:
Proper имена   (Edit)
HD 1989HD 69609
TYCHO-2 2000TYC 200-510-1
USNO-A2.0USNO-A2 0900-05867192
HIPHIP 40648
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