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HD 121247

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Spectral Classification of Stars in A Supplement to the Bright Star Catalogue MK spectral types are given for about 584 stars in A Supplement to theBright Star Catalogue. These are compared with Hipparcos parallaxes tocheck the reliability of those classifications. The estimated errors are+/-1.2 subtypes, and 10% of the luminosity classes may be wrong.
Radial velocity measurements. IV - Ground-based accompaniment to the HIPPARCOS observation program The paper presents 396 radial velocities of stars distributed in 19fields of 4 x 4 degrees. The study employs the Fehrenbach objectiveprism method and the same measuring technique used in a previous paper(Fehrenbach et al., 1987).
Third preliminary catalogue of stars observed with the photoelectric astrolabe of the Beijing Astronomical Observatory. Not Available
Meridian observations made with the Carlsberg Automatic Meridian Circle at Brorfelde (Copenhagen University Observatory) 1981-1982 The 7-inch transit circle instrument with which the present position andmagnitude catalog for 1577 stars with visual magnitudes greater than11.0 was obtained had been equipped with a photoelectric moving slitmicrometer and a minicomputer to control the entire observationalprocess. Positions are reduced relative to the FK4 system for each nightover the whole meridian rather than the usual narrow zones. Thepositions of the FK4 stars used in the least squares solution are alsogiven in the catalog.
Visual multiples. VII - MK classifications Classifications are given for 865 components of visual multiples; theyshow no systematic differences from the MK system, and the random errorsare one subclass in type and two-thirds of a luminosity class. It isfound that at least 1% of the F-type IV and V stars are weak-lined, 32%of the A4-F1 IV and V stars are Am, and 5% of the A0-A3 IV and V starsare early-type Am. Attention is called to the large fraction (55%) ofthe A3-A9 III-V stars that are of luminosity classes III or IV, unlikethe percentage (16%) at neighboring types.
Mesures d'Etoiles Doubles faites à l'Observatoire de Paris (suite) Not Available

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观测天体数据

星座:	獵犬座
右阿森松:	13^h53^m20.79^s
赤纬:	+42Â°11'05.3"
视星:	6.868
距离:	290.698 天文距离
右阿森松适当运动:	-36.5
赤纬适当运动:	7.1
B-T magnitude:	6.919
V-T magnitude:	6.873

目录:

适当名称
HD 1989	HD 121247
TYCHO-2 2000	TYC 3030-674-1
USNO-A2.0	USNO-A2 1275-08333351
HIP	HIP 67800

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