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HD 196413


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The Spacelab-1 Very Wide Field Survey of UV-excess objects. IV. The performance of the instrument in combination with optical photometry as a means of identifying stars with peculiar properties.
UV (195 nm) and Stroemgren uvby photometry of a 110 square degree fieldat high southern galactic latitudes are analyzed through a comparison ofi) UV magnitudes for 57 stars of various types common to the publishedTD1 catalogue and the Very Wide Field Camera (VWFC); and ii) observedand theoretical two-colour diagrams. The higher sensitivity of the VWFC(=~0.5magnitude) and its more complete survey are exemplified by thedetection and UV measurement of a series of objects with moderateUV-excess in addition to detection of some very blue objects of variousnature down to fainter than 12th magnitude in the optical domain. Adeeper survey with a VWFC-type instrument could provide a completesample for studies of the group properties of faint blue stars. Duringthe uvby reductions it was found that the usual procedure of plottingresiduals as functions of declination, hour angle and airmass can be apowerful and diagnostic test of photometer rigidity.

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观测天体数据

星座:摩羯座
右阿森松:20h37m48.92s
赤纬:-17°07'20.8"
视星:7.073
距离:317.46 天文距离
右阿森松适当运动:14
赤纬适当运动:-17.9
B-T magnitude:7.031
V-T magnitude:7.07

目录:
适当名称   (Edit)
HD 1989HD 196413
TYCHO-2 2000TYC 6334-1029-1
USNO-A2.0USNO-A2 0675-35663046
HIPHIP 101799

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