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HD 9123


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Fifth fundamental catalogue. Part 2: The FK5 extension - new fundamental stars
The mean positions and proper motions for 3117 new fundamental starsessentially in the magnitude range about 4.5 to 9.5 are given in thisFK5 extension. Mean apparent visual magnitude is 7.2 and is on average2.5 magnitudes fainter then the basic FK5 which has a mean magnitude of4.7. (The basic FK5 gives the mean positions and proper motions for theclassical 1535 fundamental stars). The following are discussed: theobservational material, reduction of observations, star selection, andthe system for the FK5 extension. An explanation and description of thecatalog are given. The catalog of 3117 fundamental stars for the equinoxand epoch J2000.0 and B1950.0 is presented. The parallaxes and radialvelocities for 22 extension stars with large forecasting effects aregiven. Catalogs used in the compilation of the FK5 fundamental catalogare listed.

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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Datos observacionales y astrométricos

Constelación:Hidra macho
Ascensión Recta:01h25m11.91s
Declinación:-79°53'45.8"
Magnitud Aparente:8.554
Distancia:363.636 parsecs
Movimiento Propio en Ascensión Recta:26.3
Movimiento Propio en Declinación:-1
B-T magnitude:9.8
V-T magnitude:8.657

Catálogos y designaciones:
Nombres Propios   (Edit)
HD 1989HD 9123
TYCHO-2 2000TYC 9356-785-1
USNO-A2.0USNO-A2 0075-00267158
HIPHIP 6641

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