Hemisphere:  Northern  ·  Constellation: Cepheus (Cep)

Image of the day 06/15/2018

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    LBN 552, LDN 1228 and Cohen 129, 



    
        

            Marcel Drechsler
    LBN 552, LDN 1228 and Cohen 129
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    LBN 552, LDN 1228 and Cohen 129

    Technical card

    Imaging telescopes or lenses: Takahashi Epsilon 130D  ·  Celestron Rowe-Ackermann Schmidt Astrograph

    Imaging cameras: ZWO Optical ZWO ASI 1600MM cool  ·  ATIK 490 EX Mono

    Mounts: Celestron CGE pro

    Guiding telescopes or lenses: Baader Vario Finder 60mm

    Guiding cameras: LACERTA MGEN

    Software: firecapture  ·  Photoshop CC  ·  Stellarium  ·  Pleiades Astrophoto PixInsinght 1.8 RC7  ·  Deep SkyStacker 3.3.4

    Filters: Baader IR Pass 2" 685 NM  ·  Astrodon RGB E-Series  ·  Baader Luminance 2"


    Dates:March 30, 2018April 9, 2018June 5, 2018

    Frames:
    Baader IR Pass 2" 685 NM: 1080x10" (gain: 139.00) -20C bin 1x1
    Baader Luminance 2": 1270x30" (gain: 139.00) -20C bin 1x1
    Astrodon RGB E-Series: 222x300"

    Integration: 32.1 hours

    Darks: ~100

    Flats: ~100

    Bias: ~200

    Avg. Moon age: 19.30 days

    Avg. Moon phase: 66.60%

    Bortle Dark-Sky Scale: 4.00


    Basic astrometry details

    Astrometry.net job: 3811892

    RA center: 20h 58' 21"

    DEC center: +78° 19' 44"

    Pixel scale: 1.263 arcsec/pixel

    Orientation: 279.221 degrees

    Field radius: 1.022 degrees


    Resolution: 4648x3512

    Locations: Sternwarte am Bärenstein, Bärenstein, Sachsen, Germany

    Data source: Backyard

    Description

    The photo is a cooperation project of Jens Zippel from Bremen and myself.

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    LBN 552 and LDN 1228
    Molecular cloud complex in the constellation Cepheus
    32.5 hours total exposure
    (13.6 hours luminance/IR + 18,5h RGB)
    The fine nebulous structures of LBN 552 (the lighter, fuzzy area) and LDN 1228 (the fungus-like structure) in Cepheus are only slightly more than 11 degrees away from Polaris. The images show only part of the molecular clouds of LBN 552 and LDN 1228, which in turn belong to an even larger cloud system that extends far beyond the constellation of Cepheus. The molecular cloud of LBN 552 is considered the weakest in the "Lynds Bright Nebula" catalogue and is therefore a real challenge for the ambitious astrophotographer.

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    IMAGE WITH DESCRIPTIONS

    1
    Carbon star IRAS 21064+7749
    Carbon stars are late giant stars, similar to red giants or occasionally red dwarfs. From their spectra, the "sooty" outer shell of the stars absorbs the blue and yellow light components. For the observer, this leads to its marked red appearance.

    2
    Very dense area in LBN 552, at the same time a strong infrared source, which indicates star formation inside.

    3
    Open star formation area with 3 visible young stellar objects embedded in a dense molecular cloud. In addition, 2 prominent Herbig-Haro objects are visible.

    4
    Young stellar object (YSO)
    YSO are stars shortly after a protostar has started its nuclear fusion.

    5
    Exposed star formation area RNO 129
    Consisting of the yellow reflection nebula GN 21.00.4 and some young stellar objects.

    6
    Herbig-Haro Objects
    Stars emitting a huge jet, similar to Hubble's Variable Nebula (NGC 2261). They occur when gas emitted by the star meets clouds of dust. They are often observed around a single star, where they are aligned along its axis of rotation. Herbig-Haro objects have a very short life span of at best a few thousand years.

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    LBN 552, LDN 1228 and Cohen 129, 



    
        

            Marcel Drechsler