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HD 165888


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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.

Minor planets and related objects. XVII - Five-color photometry of four asteroids
Asteroids (6), (14), (39), and (51) were observed at the Leiden SouthernStation. Only (39) Laetitia seems to show some variation in color (3% invisual-ultraviolet) correlated to the light curve. If a similar effectis present for (6) Hebe, it should only be present at small phaseangles. The light curves of (14) Irene and (39) Laetitia show lightvariations of a few percent of the rotational period indicating probablesurface macrostructure.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Yilan
Sað Açýklýk:18h08m37.18s
Yükselim:-09°48'05.4"
Görünürdeki Parlaklýk:9.334
özdevim Sað Açýklýk:13
özdevim Yükselim:-9.7
B-T magnitude:10.16
V-T magnitude:9.403

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 165888
TYCHO-2 2000TYC 5680-763-1
USNO-A2.0USNO-A2 0750-12728687
HIPHIP 88872

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