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HD 170640


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Walraven photometry of nearby southern OB associations
Homogeneous Walraven (VBLUW) photometry is presented for 5260 stars inthe regions of five nearby southern OB associations: Scorpio Centaurus(Sco OB2), Orion OB1, Canis Major OB1, Monoceros OB1, and Scutum OB2.Derived V and (B - V) in the Johnson system are included.

The S201 far-ultraviolet imaging survey. III - A field in Sagittarius
Far-ultraviolet imagery of a 20 deg diameter field in Sagittarius,centered near (1950) R.A. 18 h 34 m, decl. -30 deg 25 arcmin, wasobtained by the S201 far-ultraviolet camera during the Apollo 16mission. In a 10-minute exposure covering the 1250-1600 A wavelengthrange, 1034 star images are detectable, with a limiting ultravioletmagnitude of about 10. Most of these objects are identified withearly-type stars listed in the Smithsonian Astrophysical ObservatoryStar Catalog, the Catalog of Stellar Identifications, or both, but 203objects remain unidentified or are identified with late-type stars. Thephotometric measurements appear to be in reasonable agreement with thoseof the International Ultraviolet Explorer for stars in common, and withexpectations for A0 stars. A detailed photometric study was made of theMessier 8 region, and it is concluded that dust-scattered starlightcontributes about half of the total radiation observed from the centralregion of M8.

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Dades d'Observació i Astrometria

Constel·lació:Corona Australis
Ascensió Recta:18h32m13.42s
Declinació:-37°12'44.6"
Magnitud Aparent:7.773
Distancia:709.22 parsecs
Moviment propi RA:1
Moviment propi Dec:-9.2
B-T magnitude:7.764
V-T magnitude:7.773

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 170640
TYCHO-2 2000TYC 7406-701-1
USNO-A2.0USNO-A2 0525-36782730
HIPHIP 90871

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