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IC 405 Flaming Star Nebula (Sh2-229, LBN 795, vdB34, CED 42) in Auriga

HaRGB combination (Click for a larger view 1800 x 1800 px)

SII-Ha-OIII mapped color, green removed, HaRGB to colorize the stars (Click for a larger view 1800 x 1800 px)

SII-Ha-OIII, 50% green removed, HaRGB to colorize the stars (Click for a larger view 1800 x 1800 px)

Details

IC 405 Flaming Star Nebula (Sh2-229, LBN 795, vdB34, CED 42) - Bright emission and reflection nebula in Auriga

IC 405 is an emission and reflection nebula in the constellation Auriga, surrounding the bluish star AE Aurigae. It lies about 1500 light years distant, spans about 5 light years. The red and purple colors of the nebula are present in different regions and are created by different processes. The bright star AE Aurigae, visible toward the image center, is so hot and it is blue, emitting light so energetic it knocks electrons away from surrounding gas. The purple region's color is a mix of this red light and blue light emitted by AE Aurigae but reflected to us by surrounding dust. The two regions are referred to as emission nebula and reflection nebula, respectively.

North is up. The Horizontal FOV is about 100'. The image almost centered at:

Right Ascension 5 : 16.2 (h:m)
Declination +34 : 16 (deg:m)
Distance 1.5 (kly)
Brightness -
Apparent Dimension

50 x 30 (arc min)

Seeing: Pickering 7 rating - Good
Optic(s): APO 90/600+WO field flatener @ f/4.9
Mount: ASA DDM 85 - operated by my friend Emil Ivanov
Camera: Artemis Art 4021 - monochrome CCD camera – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomik Ha, OIII, SII, R, G, B set, Truetek Computerized Filter Wheel
Dates/Times: 2011-11-03
Location: Rozhen Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

Ha = 40 min, OIII = 30 min, SII = 40 min, R = 15 min, G = 10 min, B = 10 min, (Bin 1), Subexposures: HaOIIISII = 10 min, RGB = 5 min, Total Exposure Time - 145 min

More details: Dark frames reduction
Guiding: SBIG STL-11000M-selfguiding on 12" ASA Astrograph
Processing:

PixInsight / PS

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All Contents copyright Velimir Popov unless otherwise noted.