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HD 102980


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CCD astrometry and instrumental Delta-V photometry of wide visual double stars. III - Differential measurements of often observed southern pairs
We present accurate relative positions and instrumental visual (BesselV) magnitude differences of southern wide star components. The meanaccuracy of the angular separation is 0.02 arcsecs, which corresponds to1.5 micron on the CCD chip, and of magnitude difference 0.007mag/exposure. The program pairs are targets of the HIPPARCOS mission andthey have been observed at least four times in the last 150 yrs.

CCD measurements of visual binaries
CCD measurements of visual double stars were obtained with the ESO 1.5 mdanish reflector. All binaries observed are candidates for the HIPPARCOSInput Catalogue. More than 400 observations have been made in four clearnights. The accuracy obtained is comparable to the accuracy of thephotographic technique, but the observing and reduction times are oneorder of magnitude smaller.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Erbogan
Sað Açýklýk:11h51m11.24s
Yükselim:-36°56'08.9"
Görünürdeki Parlaklýk:7.814
Uzaklýk:297.619 parsek
özdevim Sað Açýklýk:-17.7
özdevim Yükselim:-0.2
B-T magnitude:7.858
V-T magnitude:7.818

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 102980
TYCHO-2 2000TYC 7230-312-1
USNO-A2.0USNO-A2 0525-14514570
HIPHIP 57807

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