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HD 189089


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Mesures de vitesses radiales. VII. Accompagnement AU sol DU programme d'observation DU satellite Hipparcos. Radial velocities. VII. Ground based measurements for Hipparcos.
We publish 734 radial velocities of stars distributed in 28 fields of4x4deg. We continue the PPO series (Fehrenbach et al. 1987; Duflot etal. 1990 and 1992), using the Fehrenbach objective prism method.

Color excesses of classical cepheids. I
The color excesses of eleven cepheids have been determined with the aidof photometry of field stars found in the proximity of the variables. Acomparison of the color excesses with previous color-excess results isgiven. Four cepheids: RT Aur, DT Cyg, Zeta Gem, and T Vul, haverelatively small and well-established reddening values. These fourstars, along with Alpha UMi, can serve as standards to calibratereddening-free indices with intrinsic color indices such as (b-y) or(B-V).

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Observation and Astrometry data

Constellation:Sagitta
Right ascension:19h57m44.06s
Declination:+17°08'45.3"
Apparent magnitude:7.819
Distance:543.478 parsecs
Proper motion RA:0.1
Proper motion Dec:-11.9
B-T magnitude:7.791
V-T magnitude:7.817

Catalogs and designations:
Proper Names
HD 1989HD 189089
TYCHO-2 2000TYC 1620-1305-1
USNO-A2.0USNO-A2 1050-15814242
HIPHIP 98230
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