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HD 157809


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ICCD speckle observations of binary stars. III - A survey for duplicity among high-velocity stars
An analysis of speckle interferometry data for 182 stars has resulted inthe detection of 10 binaries, four of which are newly resolved systems.After correcting for selection effects, the data are found to becompatible with a total frequency for high-velocity long-period doubleswhich is as large as that for low-velocity stars. Based on spectroscopicparallaxes and visual magnitudes, these binaries are found to be within100 pc of the sun, with eight having linear separations of less than 20AU. Four of the binaries are determined to have periods of less than 20yr.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Yilanci
Sað Açýklýk:17h25m17.42s
Yükselim:+06°05'41.9"
Görünürdeki Parlaklýk:9.094
özdevim Sað Açýklýk:-50.4
özdevim Yükselim:-54.4
B-T magnitude:10.103
V-T magnitude:9.178

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 157809
TYCHO-2 2000TYC 413-309-1
USNO-A2.0USNO-A2 0900-09759153

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