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.
Pressing one of the highlighted buttons will open a new window with an other size or version of the image above.
|Larger size:||1600 x 1200px – LRGB Color|
|Maximum size:||2000 x 1500px – LRGB Color|
Click on the different tabs shown below to view the corresponding object, image and equipment information.
The last tab is used for any comments regarding the image, focus, framing, conditions etc.
|Right ascension||:||20h 05m 59s|
|Declination||:||+35° 46′ 38″|
|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
|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)
|Corrector||:||Televue 2″ TRF 2008 flattener/reducer with 15% decrease focal length: 384mm f/4.8|
|Mount||:||Losmandy G-11 Gemini|
|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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