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Thread: LBN 36, LBN 37, Sharpless 2-33

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    Default LBN 36, LBN 37, Sharpless 2-33



    Here is an image of the LBN36, LBN 37, Sharpless 2-33 region. These objects are HII regions. The Sharpless is one of those unusual Sharpless objects that are NOT predominantly red (due to dominant Ha emission). Also, there are many background galaxies in this image that are really hard to spot without the annotated image. Only one background galaxy (CGCG-023-004) has a distance estimate based on redshift. There are also some molecular clouds (or cold clumps / dense cores) in or about these objects.

    Image and details can be accessed on the main image page from the link below. The annotated image has a link below for your convenience, but it can also be accessed from the main page.

    As is typical with these regions of nebulosity, annotation is always a challenge. However, this annotation was more challenging since there is there is some disagreement in the catalogs causing me some confusion:

    1. The Lynds catalog has LBN 36 and LBN 37 in identical locations but with different dimensions (30x50, 20x30 arc minutes), color (3-redder, 2), and brightness 5, 6-dimmest) respectively. The Lynds catalog identifies LBN 37 with Sharpless 2-33.
    2. The Sharpless catalog shows 2-33 as a diameter of 35 (consistent with LBN 37) and brightness 1-dimmest (consistent with LBN 37).
    3. Aladin plots LBN36 and LBN37 in different locations. This may be an artifact of 1950 and 2000 epochs and galactic rather than equatorial representation.
    4. The Lynds catalog on brightness seems inconsistent with size (the larger being brighter!?) for the same location when clearly the smaller core is brighter.
    5. Lynds' original paper clearly lists LBN 36 and 37 separately with different characteristics. It seems her intention was to describe 2 objects even thought the listed locations are identical

    Given some of the challenges above, The annotation image with respect to LBN 36 and LBN 37 location is a bit of a personal interpretation. Everything else is factual (from catalogs). As always, let me know if you think I got something wrong on the annotation.

    (Thumbnail image only)

    (Link to image page)

    Annotated Image:
    http://www.jthommes.com/Astro/images..._annotated.jpg

    Scope: Explore Scientific MN152 Maksutov Newtonian at f/4.8
    Camera: Atik 383L (Astronomik Gen 2 LRGB Filters)
    Jim Thommes

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  2. The Following 2 Users Say Thank You to jthommes For This Useful Post:

    j.gardavsky (08-07-2019),Makuser (08-07-2019)

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    Default Re: LBN 36, LBN 37, Sharpless 2-33

    Hello Jim. A very nice capture of LBN 36 and 37 (Lynds Bright Nebulae). I especially enjoyed the annotated version on your Astro site. Thanks for sharing this image with us Jim, and the best of wishes for many clear night skies.
    - Marshall

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    Default Re: LBN 36, LBN 37, Sharpless 2-33

    Quote Originally Posted by Makuser View Post
    Hello Jim. A very nice capture of LBN 36 and 37 (Lynds Bright Nebulae). I especially enjoyed the annotated version on your Astro site. Thanks for sharing this image with us Jim, and the best of wishes for many clear night skies.
    Marshal,
    Thanks for the comment on the image and the annotation. Much appreciated.
    Jim Thommes

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