Sh2-129 in Cepheus
This Sharpless object is an extremely faint emission nebula
which is located about 4 degrees west of the better-known large nebula IC 1396 in the constellation Cepheus. It has an
interesting shape and surrounds a loose association of (slightly brighter)
stars which are located slightly above the image's center. This asterism
is probably connected to the nebula and provides the UV light which
excites the hydrogen in the nebula and causes it to emit light.
IC 1396 and Surrounding Area, telelens photograph.
Sh2-129 in Cepheus in Hα, which is part of this image.
- Instruments: Hα: 4.9" f/3.8 Wright-Newtonian, RGB: 4.9" f/3.8 Wright-Newtonian + TMB 4.1" f/6.2 APO
- Exposures: Hα: 30 x 10 min, RGB: various
- Cameras: Hα: ATIK 383L+, RGB: Canon 350D with Baader UV-IR-Cut-Filter + QHY8 Pro
- Dates: Hα: September 16, 2012, RGB: August 30, 2008 + September 16, 1012
- Locations: Wallackhaus, Carinthia
- Conditions: (September 15, 2012): SQM-L sky brightness 21.3 mag/arcsec2, seeing 6/10, temperature +4°C, no wind, high humidity
- Autoguider: Lacerta MGEN
- Enhancement: Basic data reduction, combine, logarithmic curves, local contrast enhancement, noise filtering, star size reduction, Hα + RGB composition, color correction
- Notes: A combination of the following images: Hα and color. Color
images taken with the TMB refractor on a setup parallel to the Hα images
were also added to the color rendition. Most CCD exposures were taken during my
stay at the Großglockner-Hochalpenstraße in
September 2012. See an Observation Report of this event (in German): Glockner 2012.
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