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HD 165887


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Radial-velocity measurements. V - Ground support of the HIPPARCOS satellite observation program
The paper presents data on 1070 radial velocity measurements of starsdistributed in 39 fields measuring 4 deg x 4 deg. The PPO series ofFehrenbach et al. (1987) and Duflot et al. (1990) is continued using theFehrenbach objective prism method.

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.

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Osservazione e dati astrometrici

Costellazione:Ofiuco
Ascensione retta:18h08m07.24s
Declinazione:+02°13'07.2"
Magnitudine apparente:6.622
Distanza:138.122 parsec
Moto proprio RA:10
Moto proprio Dec:-6.8
B-T magnitude:6.817
V-T magnitude:6.639

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 165887
TYCHO-2 2000TYC 435-4738-1
USNO-A2.0USNO-A2 0900-11693132
HIPHIP 88841

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