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HD 210040


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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.

Photoelectric photometry of luminous B-type stars in a Milky Way field in Cepheus
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Observation and Astrometry data

Constellation:Cepheus
Right ascension:22h05m32.40s
Declination:+62°15'42.1"
Apparent magnitude:8.733
Distance:10000000 parsecs
Proper motion RA:-0.6
Proper motion Dec:-5.2
B-T magnitude:8.791
V-T magnitude:8.738

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 210040
TYCHO-2 2000TYC 4267-2282-1
USNO-A2.0USNO-A2 1500-08765894
HIPHIP 109054

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