Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Sh2-120  ·  Sh2-121  ·  V1331 Cyg  ·  V1547 Cyg  ·  V1719 Cyg  ·  V1959 Cyg  ·  V1980 Cyg  ·  V1982 Cyg  ·  V2201 Cyg  ·  V2324 Cyg  ·  V2568 Cyg  ·  V3095 Cyg
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Sh2-120, Sh2-121, a couple small emission nebulae, and five reflection nebulae including the partial ring around V1331 Cyg, Alan Brunelle
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Sh2-120, Sh2-121, a couple small emission nebulae, and five reflection nebulae including the partial ring around V1331 Cyg

Getting plate-solving status, please wait...
Sh2-120, Sh2-121, a couple small emission nebulae, and five reflection nebulae including the partial ring around V1331 Cyg, Alan Brunelle
Powered byPixInsight

Sh2-120, Sh2-121, a couple small emission nebulae, and five reflection nebulae including the partial ring around V1331 Cyg

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Description

Revision 12/16/2022:
Another in my series of Cloudy Day revisions applying new methods and processes into the workflow.  In this, I also use BlurXTerminator for the first time.  The best thing about the application of this new process is that it has dealt well with the star elongation in the corners due to backfocus issues and also tilt.  Because of the tilt, the backfocus issue was most severe in the upper right corner.  Though it may not have been noticed in the standard page view with an image with fewer stars, the multitude of stars actually makes it more noticable since these oblong stars appear to line up to make it appear somewhat striated.  BXT made easy work of that.  And with the AI method of the process, it handled each corner and throughout differently and successfully.  I did use BXT for a "convolution" process of the few bright nebulosities and it seemed to work fine.  Without using a heavy touch, I was able to get essentially the same detail in those parts of the image as I had using the standard methods.  Over strength of BXT created bright spots that made no sense.  And honestly, for this image, I find I can get the same amount of improved detail using the "Detail" function in NoiseXTerminator.  Not sure that will hold up with all types of images.  But the star correction is fabulous.  Star reduction of BXT was fine but I still employed Bill Blanshan's method later in the process for refinement of desired star intensity.  But either one helped in this image.  The previous revision's star reduction left the starfields looking flat, with the old methods tending to bring all the finer stars to similar sizes and intensities.  I find this to be especially bad in fields that have such dense starfields.  In any case star numbers are reduced in this revision.

Color of the background is slightly boosted and I believe the greyish components and depth are better in this.  But these may be personal regarding preference.

Old Description:
In my search for star-birthing regions, I stumbled upon these molecular clouds just between the North America nebula and the Elephant Trunk.  I think more broadly, this is LDN 988A.  In my searching, on Aladin, I noted that there was a concentration of YSO around the variable star V`1982 Cyg, which itself is a YSO, type Herbig Ae/Be star such as the star at the center of the Iris reflection nebula.  This can be seen near the center of the image, with a moderately bright star and RN right on the lower edge of the densest part of the molecular cloud.  I already wrote a bit about Ae/Be stars in my presentation NGC 7023: Comparison of image field with QHY5III462C between broadband (UV/IR cut filter) vs. NIR (950 edge filter).  DSS2 and PanStarrs images are a bit muddled as they present this area, so I was presently surprised when I stretched this image and saw the more detailed scene here.   This area shows up often in AstroBin on wider field views and occasionally with similar field of view as I present here.  In this presentation, north is roughly left.

V1982 is an area that I will be revisiting precisely because of the concentration of YSO and the like.  Concentrations of these are particularly helpful because I can fit this compact area within the field of view of my small VIS/NIR camera and do photometry simultaneously on many stars at once.  Once I demount my RASA and get my 5 inch MakNewt on it, I will image this and see what stars are available.  Typically I have found that I can see everything that a J band image on Aladin shows, including stars that are otherwise obscured in the visible by molecular clouds.  YSO parked inside or near molecular clouds are of particular interest to me.  I will add more to why that is when I present some images of the head of the Elephant Trunk I made with the NIR camera.  But until I get the telescope I want, I likely will only be in "practice" mode, learning the software, and the methods.  Many scopes are 6-7 months backordered.

This image was unexpected because smoke has been obscuring the sky here in western Oregon for some time.  Not horrible, but also really not worth setting up.  But because we are on the western edge of the smoke, a front passed and cleared us out for a few days here.  This night was the best so far.  Then clouds, then last night not bad, but high level smoke from Canada has made its way south.  So...

For QHY268 users: I used Photographic Mode (0) at gain 28, offset 10.  Yes, I did star size reduction and intensity reduction.  I did try to not lose stars at the bottom end though.  I believe that starfields really do offer an objective perspective on likely depth of field for these dark cloudy images.

Tilt and backfocus issues are back in this image.  As unexplained as when they disappeared in my IC 1396 mosaic.  I can't wait wait to get a permanent setup.  This stuff is a pain in the...

Oh, and starhaloreducer in PixInsight seems broken to me.  I have used it in the past, but after an update or two, it now fails to present an image within the utility.  Just a black box with the star in the center.  While not the worst halo I have ever seen, the one right near the other reflection nebulae is unfortunate, because it competes ever so slightly with the delicate refection nebulae.  Anyone have an answer?

Comments

Revisions

  • Sh2-120, Sh2-121, a couple small emission nebulae, and five reflection nebulae including the partial ring around V1331 Cyg, Alan Brunelle
    Original
  • Sh2-120, Sh2-121, a couple small emission nebulae, and five reflection nebulae including the partial ring around V1331 Cyg, Alan Brunelle
    B
  • Final
    Sh2-120, Sh2-121, a couple small emission nebulae, and five reflection nebulae including the partial ring around V1331 Cyg, Alan Brunelle
    C

B

Description: I mentioned that I thought that the faint star halo around the bright star detracted from the reflection nebulae, but for some reason PI's StarHaloReducer did not work. Since then I noticed that whatever bug it had went away, so here is the fixed version. The halo was faint, so I applied a light hand to the correction. A couple other bright stars also had halos, but those were less impactful, so they are untouched.

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C

Title: Revision 12/16/2013

Description: See updated Description

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Sh2-120, Sh2-121, a couple small emission nebulae, and five reflection nebulae including the partial ring around V1331 Cyg, Alan Brunelle