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New Estimates of the Solar-Neighborhood Massive Star Birthrate and the Galactic Supernova Rate The birthrate of stars of masses >=10 Msolar is estimatedfrom a sample of just over 400 O3-B2 dwarfs within 1.5 kpc of the Sunand the result extrapolated to estimate the Galactic supernova ratecontributed by such stars. The solar-neighborhood Galactic-plane massivestar birthrate is estimated at ~176 stars kpc-3Myr-1. On the basis of a model in which the Galactic stellardensity distribution comprises a ``disk+central hole'' like that of thedust infrared emission (as proposed by Drimmel and Spergel), theGalactic supernova rate is estimated at probably not less than ~1 normore than ~2 per century and the number of O3-B2 dwarfs within the solarcircle at ~200,000.
Catalog of Galactic OB Stars An all-sky catalog of Galactic OB stars has been created by extendingthe Case-Hamburg Galactic plane luminous-stars surveys to include 5500additional objects drawn from the literature. This work brings the totalnumber of known or reasonably suspected OB stars to over 16,000.Companion databases of UBVβ photometry and MK classifications forthese objects include nearly 30,000 and 20,000 entries, respectively.
Photometric Variability and Spectral Features of the Protoplanetary Nebula LSII + 34°26 = V1853 Cyg Not Available
UBV beta Database for Case-Hamburg Northern and Southern Luminous Stars A database of photoelectric UBV beta photometry for stars listed in theCase-Hamburg northern and southern Milky Way luminous stars surveys hasbeen compiled from the original research literature. Consisting of over16,000 observations of some 7300 stars from over 500 sources, thisdatabase constitutes the most complete compilation of such photometryavailable for intrinsically luminous stars around the Galactic plane.Over 5000 stars listed in the Case-Hamburg surveys still lackfundamental photometric data.
A search for stars physically associated with the 16-day Cepheid X Cygni. I - Luminous stars in the field Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1983AJ.....88..650T&db_key=AST
KURZE MITTEILUNG. Zur Expansion der Assoziation Cep III Not Available

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Observation and Astrometry data

Constellation:	Κύκνος
Right ascension:	20^h47^m01.68^s
Declination:	+34Â°35'40.5"
Apparent magnitude:	9.993
Proper motion RA:	-1.4
Proper motion Dec:	-5.6
B-T magnitude:	10.196
V-T magnitude:	10.01

Catalogs and designations:

Proper Names	(Edit)
TYCHO-2 2000	TYC 2695-3670-1
USNO-A2.0	USNO-A2 1200-15948262
HIP	HIP 102560

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