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HD 171052


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The position corrections of 1400 stars observed with PA II in San Juan.
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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.

Observational studies of Cepheids. II - BVRI photometry of 112 Cepheids
Over 4000 differentially determined photoelectric BVRI observations andthe resulting light curves are presented for 112 Cepheids accessiblefrom Northern Hemisphere observatories. The internal precision of thesedata is better than + or - 0.01 mag, and the accuracy of transformationto the Johnson BVRI system is nearly as good.

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观测天体数据

星座:盾牌座
右阿森松:18h33m03.97s
赤纬:-10°42'11.6"
视星:8.945
距离:60.753 天文距离
右阿森松适当运动:61.8
赤纬适当运动:25.2
B-T magnitude:9.882
V-T magnitude:9.023

目录:
适当名称   (Edit)
HD 1989HD 171052
TYCHO-2 2000TYC 5695-9-1
USNO-A2.0USNO-A2 0750-13520973
HIPHIP 90943

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