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HD 53384 (Choqwit Bunny Star)


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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.

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:Zwillinge
Right ascension:07h05m41.13s
Declination:+20°59'45.0"
Apparent magnitude:7.889
Distance:264.55 parsecs
Proper motion RA:-6.6
Proper motion Dec:-8.3
B-T magnitude:7.794
V-T magnitude:7.882

Catalogs and designations:
Proper NamesChoqwit Bunny Star
  (Edit)
HD 1989HD 53384
TYCHO-2 2000TYC 1357-847-1
USNO-A2.0USNO-A2 1050-04778602
HIPHIP 34218

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