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HD 61275


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Two-colour photometry for 9473 components of close Hipparcos double and multiple stars
Using observations obtained with the Tycho instrument of the ESAHipparcos satellite, a two-colour photometry is produced for componentsof more than 7 000 Hipparcos double and multiple stars with angularseparations 0.1 to 2.5 arcsec. We publish 9473 components of 5173systems with separations above 0.3 arcsec. The majority of them did nothave Tycho photometry in the Hipparcos catalogue. The magnitudes arederived in the Tycho B_T and V_T passbands, similar to the Johnsonpassbands. Photometrically resolved components of the binaries withstatistically significant trigonometric parallaxes can be put on an HRdiagram, the majority of them for the first time. Based on observationsmade with the ESA Hipparcos satellite.

Micrometer Measures of Double Stars
Micrometer measures of 795 double stars made with the 26 inch (0.66 m)refractor of the US Naval Observatory from 1984 to 1990 are presented.

Measurements of double stars 1993.67 - 1998.13
624 Micrometer Measurements of 224 pairs with a 32.5 cm Cassegrain, 719Measurements of 310 double stars with a 360 mm Newtonian are given.Tables 1 to 4 are available in electronic form only at the CDS130.79.128.5 or via http://cdsweb.u-strasbg.fr/Abstract.html

MK classification for visual binary components
MK classifications are presented for both components of 208 visualbinaries, most of which appear in the Third Catalogue of Orbits ofVisual Binary Stars (Finsen and Worley 1970) and which have onlycomposite MK spectral types and visual-magnitude differences. Comparisonbetween the results obtained and the several individually observed orpreviously inferred component types suggest that an accuracy of plus orminus 2 to 3 spectral subtypes may be expected for both unevolved pairsand evolved pairs; an accuracy of plus or minus 0.5 to 1.0 luminosityclasses is expected for evolved pairs.

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Observation and Astrometry data

Constellation:Petit Chien
Right ascension:07h38m30.45s
Declination:+00°30'17.9"
Apparent magnitude:7.215
Distance:392.157 parsecs
Proper motion RA:-3.3
Proper motion Dec:-6.7
B-T magnitude:7.141
V-T magnitude:7.209

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 61275
TYCHO-2 2000TYC 179-2562-1
USNO-A2.0USNO-A2 0900-05226622
HIPHIP 37198

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