Hemisphere:  Northern  ·  Contains:  NGC 225  ·  NGC225  ·  VdB4

Image of the day 08/11/2020

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    VDB4 and the Sailboat Cluster | A Reflecting Dark Nebula, 


            Kevin Morefield
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    VDB4 and the Sailboat Cluster | A Reflecting Dark Nebula

    Imaging telescopes or lenses: Planewave CDK14

    Mounts: Planewave L-350

    Guiding telescopes or lenses: Planewave CDK14

    Guiding cameras: Starlight Express UltraStar Mono

    Software: CCDWare CCDAutoPilot 5  ·  Adobe Photoship CC  ·  CCDWare CCDStack 2  ·  PixInsight

    Filters: Astrodon Blue  ·  Green  ·  Red  ·  Luminance

    Dates:Aug. 1, 2020

    Astrodon Blue: 30x600" (gain: 56.00) -10C bin 2x2
    Green: 30x600" (gain: 56.00) -10C bin 2x2
    Luminance: 43x600" (gain: 56.00) -10C bin 2x2
    Red: 34x600" (gain: 56.00) -10C bin 2x2

    Integration: 22.8 hours

    Darks: ~20

    Flats: ~20

    Flat darks: ~20

    Bias: ~20

    Avg. Moon age: 12.61 days

    Avg. Moon phase: 94.85%

    Bortle Dark-Sky Scale: 3.00

    Astrometry.net job: 3723939

    RA center: 0h 43' 33"

    DEC center: +61° 52' 55"

    Pixel scale: 0.609 arcsec/pixel

    Orientation: 131.303 degrees

    Field radius: 0.294 degrees

    Resolution: 2401x2520

    Locations: Sierra Remote Observatory, Auberry, California, United States

    Data source: Own remote observatory

    Remote source: Sierra Remote Observatories


    The open cluster NGC 225, known as the sailboat, appears just above the dark nebula VDB4. Not much is out there on these two, either photographically or descriptively. It appears that the Cluster is in front of the nebula as the dust is reflecting the blue light of the young stars.

    It appears to me that the is significant gas surrounding the stars in the cluster as well. The area around the stars seems to be glowing a bit and brighter than the sky background further away. This gives the image a soft look which I retained. Attempts to add contrast or bring up the black level obliterated the dark nebula below the cluster so I assumed this soft glow is real.

    I believe this to be the sharpest data I've captured to date. Even after star alignment and the resample the median FWHM was below 2.0"and the Luminance median around 1.8". Sharpness that is completely wasted on this sort of target!

    CCDStack for Calibration, deconvolution, and stretching.
    Pixinsight for Cosmetic correction, DBE, Star Alignment, and Image integration
    Topaz 5.1 for noise reduction
    Photoshop for Curves, Color and Saturation adjustments



    Kevin Morefield
    License: None (All rights reserved)

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    VDB4 and the Sailboat Cluster | A Reflecting Dark Nebula, 


            Kevin Morefield

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