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TYC 8844-1236-1


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CCD astrometry and UBV photometry of visual binaries. II. Visual double stars with mainly G - type primaries and relatively small angular separation
Differences Delta V of magnitude and Delta (B-V) and Delta (U-B)colours, as well as separations and position angles of 42 relativelyclose double stars are presented. The selection criteria of our sampleare: the relatively small separation (between 2.5 and 5 arcseconds),magnitude difference under 1.25 mag, and mainly G-type primaries. TheCCD observations, performed at the 90 cm Dutch telescope at ESO, weremade using the Bessel U, B and V filters; the astrometry was done in theV filter only. From the analysis of the photometric data we concludethat 16 binaries in our sample have components with practically the sameT_eff, since they have almost the same colours; one binary hascomponents with identical characteristics. We also note the goodinternal accuracy of the astrometric CCD measurements. Based onobservations made at ESO La Silla, Chile.

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Osservazione e dati astrometrici

Costellazione:Tucano
Ascensione retta:00h31m10.51s
Declinazione:-64°17'37.0"
Magnitudine apparente:10.382
Moto proprio RA:8.8
Moto proprio Dec:-15.7
B-T magnitude:11.338
V-T magnitude:10.461

Cataloghi e designazioni:
Nomi esatti   (Edit)
TYCHO-2 2000TYC 8844-1236-1
USNO-A2.0USNO-A2 0225-00139596
HIPHIP 2449

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