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HD 179491


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관련 글

Stroemgren photometry of F- and G-type stars brighter than V = 9.6. I. UVBY photometry
Within the framework of a large photometric observing program, designedto investigate the Galaxy's structure and evolution, Hβ photometryis being made for about 9000 stars. As a by-product, supplementary uvbyphotometry has been made. The results are presented in a cataloguecontaining 6924 uvby observations of 6190 stars, all south ofδ=+38deg. The overall internal rms errors of one observation(transformed to the standard system) of a program star in the interval6.5

Estimation of spectral classifications for bright southern stars with interesting Stromgren indices
This paper investigates the degree of success with which uvby photometrycan be applied to predict spectral classifications for 947 A, F, and Gstars brighter than an apparent magnitude of 8.3 and with four-colorindices indicating some kind of interesting, unusual, or peculiarspectrum. One or several possible spectral classifications are estimatedfor each star from photometry alone, double stars are distinguished, andthe estimates are compared with published classifications. The resultsshow that the framework provided by uvby photometry can be extended toinclude most G and K stars, reddened stars, peculiar stars, and certaintypes of double star.

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관측 및 측정 데이터

별자리:독수리자리
적경:19h12m37.00s
적위:+06°02'22.2"
가시등급:7.467
거리:218.341 파섹
적경상의 고유운동:-1.8
적위상의 고유운동:-16.1
B-T magnitude:8.239
V-T magnitude:7.531

천체목록:
일반명   (Edit)
HD 1989HD 179491
TYCHO-2 2000TYC 475-1571-1
USNO-A2.0USNO-A2 0900-14184261
HIPHIP 94383

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