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HD 172491


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SANTIAGO 91, a right ascension catalogue of 3387 stars (equinox J2000).
The positions in right ascension of 3387 stars belonging to the Santiago67 Catalogue, observed with the Repsold Meridian Circle at Cerro Calan,National Astronomical Observatory, during the period 1989 to 1994, aregiven. The average mean square error of a position, for the wholeCatalogue, is +/-0.009 s. The mean epoch of the catalogue is 1991.84.

Lunar occultation summary. II
Results of a second series of 196 two-color photoelectric lunaroccultation observations made within the interval from May 1972 toDecember 1973 are reported. Each observation has been employed toestimate the minimum magnitude difference between the observed objectand possible undetected companions. The study contains the analyses of143 disappearances and 53 reappearances. Eighteen of these eventsmanifest some degree of multiplicity. Included in the study are 18occultation events for Pleiades members.

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观测天体数据

星座:人馬座
右阿森松:18h41m36.84s
赤纬:-24°59'17.3"
视星:8.228
距离:355.872 天文距离
右阿森松适当运动:4.5
赤纬适当运动:-3.8
B-T magnitude:9.989
V-T magnitude:8.374

目录:
适当名称   (Edit)
HD 1989HD 172491
TYCHO-2 2000TYC 6862-1623-1
USNO-A2.0USNO-A2 0600-36641065
HIPHIP 91669

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