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IC 1311 and Surrounding Nebulosity in Hα


IC 1311, B343 in Ha


This area of nebulosity belongs to the Gamma Cygni Nebula Complex and is located a few degrees to the east of γ Cygni, the 3rd brightest star in Cygnus. The nebulosity pictured here is actually quite faint. It is composed mainly of hydrogen, which gives the nebula its red glow that originates from H alpha line emission at 656.3 nm. The nebula is not of uniform brightness, there are in fact a few dark nebulae in front of it, the most conspicious of those is Barnard 343, below the image's center.

IC 1311 is the designation of the galactic star cluster situated near the upper edge, to the right, which has a brightness of 13.1 mag, is located at a distance of about 33 lightyears (which is very close), and has an apparant size of 5 arcminutes.

All individual patches of nebulosity have designations in Lynd's Bright Nebulae (LBN) catalog. The patch at the left image border is designated LBN 241, the bright elongated patch at the upper left is LBN 251, which is followed by LBN 239 towards IC 1311. LBN 223 surrounds B343 and the patch of nebulosity at the lower right is designated LBN 216. Only the very brightest parts can be glimpsed visually in a rich-field telescope.

IC 1311 and Surrounding Nebulosity, in narrow-band filters, natural colors, which this image is part of.

Exposure Data

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© 2012 Walter Koprolin