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HD 17870


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Photometric Investigation of the MBM 12 Molecular Cloud Area in Aries. II. Cloud Distance
Photoelectric magnitudes and color indices in the Vilnius seven-colorsystem for 152 stars are used to investigate the interstellar extinctionin the area of the Aries molecular cloud MBM 12, coinciding with theL1454 and L1457 dust clouds. Spectral types, absolute magnitudes, colorexcesses, interstellar extinctions and distances of the stars aredetermined. The plot of interstellar extinction A_V versus distanceshows that the dust cloud is situated at a distance of 325 pc, at 180 pcfrom the Galactic plane, and its true diameter is about 11 pc. Theinterstellar extinction law in the area is found to be normal, typicalfor the diffuse dust. Ten peculiar or unresolved binary stars and someheavily reddened stars are detected.

Photometric Investigation of the MBM 12 Molecular Cloud Area in Aries. I. Photoelectric Photometry
The results of photoelectric photometry in the Vilnius seven-colorsystem are given for 152 stars down to 12.2 mag in the area of themolecular cloud MBM 12 and the dust clouds L1454 and L1457 in Aries. Theresults of photometric classification of stars are also given. Theinvestigation of interstellar extinction in the area is described in thenext paper.

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Observation and Astrometry data

Constellation:Widder
Right ascension:02h52m46.89s
Declination:+20°07'30.0"
Apparent magnitude:8.891
Distance:289.017 parsecs
Proper motion RA:8.3
Proper motion Dec:-6.8
B-T magnitude:10.241
V-T magnitude:9.003

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 17870
TYCHO-2 2000TYC 1230-724-1
USNO-A2.0USNO-A2 1050-00774134
HIPHIP 13418

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