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HD 39319


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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.

A new photometric WBVR system
A description of the new broad-band photometric system, WBVR, is given.It is shown that WBVR is close to the UBVR system but is defined bystrictly fixed response curves and the primary standard. Theconstruction of a network of secondary standards distributed uniformlyin the northern sky, as well as the coordination of the magnitudes ofthe standards to the self-consistent system are discussed. All standardsare examined for a possible brightness variability and it is found thatno light variability exceeding 0.015 mag in amplitude is present andthat their average magnitude shows stability on a scale of severalyears. The individual WBVR observations of the standards are presentedin tables.

The System of Highly Accurate Photoelectric Standards in WBVR Bands
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观测天体数据

星座:天兔座
右阿森松:05h51m21.62s
赤纬:-11°38'46.3"
视星:7.317
距离:315.457 天文距离
右阿森松适当运动:-7.6
赤纬适当运动:-4.3
B-T magnitude:7.197
V-T magnitude:7.308

目录:
适当名称   (Edit)
HD 1989HD 39319
TYCHO-2 2000TYC 5355-1735-1
USNO-A2.0USNO-A2 0750-01615526
HIPHIP 27657

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