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TYC 3179-1192-1


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2MASS Two-Color Interstellar Reddening Line in the Direction of the North America and Pelican Nebulae and the CYG OB2 Association
The slope of the interstellar reddening line in the J--H vs.H--Ks diagram of the 2MASS survey in the direction of theNorth America and Pelican nebulae, the L 935 dust cloud and the Cyg OB2association is determined. The MK types were either classified by C. J.Corbally or collected from the literature. The ratioEJ-H/EH-K_s = 2.0 is obtained by taking theaverage for the four groups of spectral classes: O3--B1, B2--B6,B7--B9.5 and red clump giants. The obtained ratio is among the largestvalues of EJ-H/EH-K_s determined till now.

Interstellar Extinction Law in the Vicinity of the North America and Pelican Nebulae
The interstellar reddening law is derived for 15 heavily reddened starsin the area which includes the North America and Pelican nebulae and thedark cloud between them. The method is based on photometry of thesestars in the Vilnius seven-color system and on their MK spectral types.The mean law in this area is very similar to the law for a much widerarea in Cygnus derived earlier by other authors. It differs from thenormal law by exhibiting somewhat stronger extinction in the violet andthe near ultraviolet spectral region, i.e., it shows a smaller ``knee"in the blue part of the spectrum.

Photoelectric Photometry of Stars in the Vilnius System in the Area of the North America and Pelican Nebulae
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Observation and Astrometry data

Constellation:はくちょう座
Right ascension:20h52m33.36s
Declination:+44°11'42.2"
Apparent magnitude:9.724
Proper motion RA:-2
Proper motion Dec:-3.1
B-T magnitude:10.176
V-T magnitude:9.762

Catalogs and designations:
Proper Names   (Edit)
TYCHO-2 2000TYC 3179-1192-1
USNO-A2.0USNO-A2 1275-14260398
HIPHIP 103040
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