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HD 64981


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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.

Interstellar reddening in the Southern Hemisphere. I - The UVBY beta observations
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Visual measurements of southern double stars
A double-star observing program is described which has been started atCordoba with a 30 cm refractor. Usually neglected Index Catalog ofVisual Double Stars (IDS) pairs south of -60 deg are selected forobservation, most of them having been measured only one or two timespreviously. A total of 174 micrometric observations of 78 wide pairs arepresented together with a few measurements of 9 double stars not foundin the IDS. Also reported is a list of 135 additional measurements of 26test stars. By comparison with all earlier observations, an estimate forthe personal equation has been made, which is applied in combinationwith catalogue proper motions to investigate the nature of many of thesepairs.

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Osservazione e dati astrometrici

Costellazione:Pesce Volante
Ascensione retta:07h50m47.20s
Declinazione:-70°46'41.8"
Magnitudine apparente:8.439
Distanza:133.869 parsec
Moto proprio RA:-32.8
Moto proprio Dec:41.5
B-T magnitude:8.781
V-T magnitude:8.468

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 64981
TYCHO-2 2000TYC 9184-363-1
USNO-A2.0USNO-A2 0150-05015124
HIPHIP 38299

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