NGC6871

NGC6871

NGC6871 (in the middle of the image) is a small open star cluster, consisting of no more than 50 member stars.
It can be found in the constellation Cygnus.

Besides the star cluster in the center, a lot of dark (B146 & 147)and emission nebulae (LBN179, LBN182) can be seen in this image.

The large dark area just right of the center of the image is Barnard 146, the “snake like” protrusion below it is Barnard 147.
To the left of Barnard 147 there is an other small open star cluster which is catalogued as Biurakan 1.

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Image data

Name  :  NGC6871
Type  :  Open cluster
Constellation  :  Cygnus
Right ascension  :  20h 05m 59s
Declination  :  +35° 46′ 38″
Distance  :  5.133 ly
Other designations  :  GC 4548, Struve 2630
Image date  :  Sep. 04, 2013
Light frames  :  9x 4 min. G&B (each) 6x 4 min. R unbinned
9x 10 min. 7nm Ha unbinned (Luminance)
Total integration  :  3h 6m
Dark frames  :  12x unbinned
Flat frames  :  20x p. filter unbinned
Created with an A3 size Posterpoweruk flatfield panel
Bias frames  : 
Software used  :  CCDOps, CCDSoft, Maxim DL, Photoshop CS4
Processing  :  CCDOPS was used for focussing. Image Acquisition was done using CCDSoft.
All separate frames were calibrated, aligned and stacked in MaxIm DL5 Pro.
Photoshop CS4 was used for further processing – curves adjustment, levels adjustment, etc.
Noel Carboni’s toolset was used as well (Local Contrast Enhancement, Deep Space Noise Reduction)
Telescope  :  TMB/LOMO 80/480
Corrector  :  Televue 2″ TRF 2008 flattener/reducer with 15% decrease focal length: 384mm f/4.8
Mount  :  Losmandy G-11 Gemini
Camera  :  SBIG ST-8300M
Guide camera  :  Atik 1HS Mono
Guide scope  :  Vixen VMC110L
Autoguide software  :  PHD Guiding
Filters  :  Baader 2″ 7nm Ha, Baader 2″ RGB + IDAS LPS-P2
Location  :  Landgraaf, The Netherlands
Comment  :  All exposures were taken through IDAS LPS-2 filter which was in front of the filter wheel.
CCD Temp was set at -10.
About 25% of the combined Ha frame was blended into the red frame.
I managed to touch the dew cap when taking darks between Ha and RGB frames.
On the dew cap there is a set of thin strings attached for creation of star spikes, so there is a slight shift of the orientation of the star spikes between the Ha and RGB frames.
Still strugling to find a correct color balance, especially when blending in Ha as Luminance

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