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Contains:  IC 444
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Vdb 75, DG99, BSF51, 





    
        

            Antonio F. Sánchez
Vdb 75, DG99, BSF51

Technical card

Resolution: 2400x1803

Dates:Jan. 25, 2014Jan. 26, 2014Jan. 28, 2014Jan. 30, 2014

Frames:
Optec 50mm B: 14x600" -25C bin 1x1
Optec 50mm G: 13x600" -25C bin 1x1
Optec 50mm L: 51x600" -25C bin 1x1
Optec 50mm R: 14x600" -25C bin 1x1

Integration: 15.3 hours

Avg. Moon age: 25.94 days

Avg. Moon phase: 17.74%

Bortle Dark-Sky Scale: 2.00

Astrometry.net job: 174931

RA center: 6h 18' 59"

DEC center: +23° 18' 14"

Pixel scale: 1.413 arcsec/pixel

Orientation: 179.530 degrees

Field radius: 0.589

Description

vdB 75,DG99,IC444,BSF 51 (Gemini) * January 2014 * ASA N12 astrograph (f/3.6, 1078mm) * DDM85 mount * FLI ML8300 at -25ºC * LRGB Optec filter set * L: 510m R: 140m G:130m B:140m *vdB 75 is a reflection nebula visible in the constellation of Gemini . The cloud is located in the western part of the constellation, in a very rich field of background stars, surrounding the bright giant star 12 Geminorum , of apparent magnitude equal to 6.95. The identification of its location is not difficult, thanks to the presence of the brilliant μ Geminorum , a red giant star of magnitude 2.87 and therefore clearly visible even in the nights are not perfectly clear, the nebula is located about a degree to the northwest, on the edge of an open cluster known as widely dispersed Cr 89 . vdB 75 is the brightest part of the nebula IC 444, which is in turn associated with an emission nebula indicated with the abbreviation Sh2-249 ; this nebula is part of the H II region BFS51, located in the central regions of the Complex hazy molecular Gemini OB1 , a vast association of stars and diffuse nebulae placed at nearly 2000 parsecs away from the solar system , the inner edge of the Perseus Arm . At the H II region are also associated with the dark nebulae LDN 1564 and LDN 1567. [3] Notes [ edit | edit source ] WIKIPEDIA ^ a b Simbad Query Result . Retrieved October 15, 2009 . ^ a b c van den Bergh, S. (December 1966). A study of reflection nebulae. . Astronomical Journal 71 : 990-998. DOI : 10.1086/109995 . Retrieved on October 14, 2009 . ^ a b c Kawamura, Akiko, Onishi, Toshikazu; Yonekura, Yoshinori; Dobashi, Kazuhito; Mizuno, Akira, Ogawa, Hideo; Fukui, Yasuo (July 1998). A 13CO Survey of Molecular Clouds in Gemini and Auriga . Astrophysical Journal Supplement 117 (387). DOI : 10.1086/313119 . Retrieved on October 19, 2009 .

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Antonio F. Sánchez
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Vdb 75, DG99, BSF51, 





    
        

            Antonio F. Sánchez