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HD 217145


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Articoli relazionati

ICCD Speckle Observations of Binary Stars.XV.An Investigation of Lunar Occultation Systems
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996AJ....112.2260M&db_key=AST

Derivation of angular diameters of stars from lunar occultations
A description is presented of the results obtained in the photoelectricobservations of occultations involving four stars. The considered starsinclude Eta Gem (ZC 946), Mu Gem (ZC 976), 187 B. Gem (ZC 1161), and 31Leo (ZC 1486). The theoretical principles of the studies are considered,taking into account point source occultations, the stellar diameter andthe influence of telescope aperture, and spectral effects. Observationaldata concerning the considered stars are presented in a table and anumber of graphs. It is pointed out that Mu Gem is a triple system.However, on account of their distances and their weakness the companionscannot affect the observed intensity curve. A combination of the deriveddiameter with the trigonometric parallax reported by Jenkins (1963)provides for the linear diameter of Mu Gem the result of 91 plus orminus 28 solar diameters.

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Osservazione e dati astrometrici

Costellazione:Acquario
Ascensione retta:22h58m35.60s
Declinazione:-05°40'26.1"
Magnitudine apparente:8.498
Distanza:2325.581 parsec
Moto proprio RA:-16
Moto proprio Dec:-6.9
B-T magnitude:10.391
V-T magnitude:8.655

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 217145
TYCHO-2 2000TYC 5241-1373-1
USNO-A2.0USNO-A2 0825-19825616
HIPHIP 113451

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