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HD 101784


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Vacuum ultraviolet imagery of the Virgo cluster region
The results are reported of an experiment using the UV imager aboard anattitude-controlled S520 type sounding rocket. The total UV fluxes ofgalaxies in the Virgo Cluster as well as the flux level of the diffuseUV background around the cluster were measured. The data on NGC 4486 andNGC 4472 confirm the variation in the degree of the 'turnup' below 200nm in the energy spectrum of the total light of elliptical galaxies. Attwo-color diagram of galaxies of visual/near-UV/vacuum UV indicates thatcolors of spiral galaxies are distributed within a strip andwell-correlated with the morphological type, while elliptical galaxiesare located differently from spiral galaxies.

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Observation and Astrometry data

Constellation:Vierge
Right ascension:11h42m49.93s
Declination:-03°32'42.4"
Apparent magnitude:7.534
Distance:139.86 parsecs
Proper motion RA:-85
Proper motion Dec:-38.1
B-T magnitude:7.525
V-T magnitude:7.534

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 101784
TYCHO-2 2000TYC 4934-1279-1
USNO-A2.0USNO-A2 0825-07535500
HIPHIP 57133

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