NGC 6914 and vdB 132 Region
In the image above, north is to the left and east is down.
This complex of nebulae lies some 6.000 light-years distant in
the constellation Cygnus. NGC 6914 is the name of the blue combined
emission/reflection nebula around three stars near the center of the image (in
the dark patch), van den Bergh 132 designates the central one. Most of the other
large emission nebula patches in this image seem to belong to a huge
supernova shell located in the next inner spiral arm of our galaxy. Ultraviolet
radiation from the hot, massive and young stars of the Cygnus OB2 association
ionize the region's hydrogen gas
The nebulosity emits all of its light in isolated emission lines. The most
prominent of those are the Hα, [OIII] and [SII] lines, which were
exclusively recorded to obtain the image shown above. This is a "natural color"
composition mixed so that the resulting colors are close to the visible spectrum
of the human eye. The following mixture was used:
- Red = Hα + 24% [SII]
- Green = [OIII]
- Blue = [OIII] + 15% Hα to compensate for missing Hβ
LBN 310 and Surrounding Nebulosity, Wide Field, telelens photograph.
NGC 6914 and vdB 132 Region in Hα, which is part of this image.
NGC 6914 and vdB 132, Newtonian photograph.
- Instrument: 4.9" f/3.8 Wright-Newtonian
- F/stop: 3.8
- Exposure: Hα: 48 x 10 min, [OIII]: 28 x 10 min, [SII]: 31 x 10 min
- Camera: ATIK 383L+
- Date: August 17 - 31, 2012 (4 nights)
- Location: Floridsdorf, Vienna
- Conditions: Visual limiting magnitude 4.5 mag, SQM-L sky brightness 18.8-19.3 mag/arcsec2, seeing ?, no wind, low humidity, 12-22°C, interrupted by clouds
- Autoguider: Lacerta MGEN
- Enhancement: Basic data reduction, registration and combination, background flattening, noise reduction, deconvolution, non-linearization, local contrast enhancement, star size reduction, color synthesis using tone mapping, color correction
- Notes: The individual exposure were taken in four different nights in the summer of 2012.