IC5146 – Coconnevel

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  • #16427

    Musquetier
    Participant
    posts: 502

    IC5146 met de TS 130/910mm APO, 0,8x reducer/flattener, Baader filters en ZWO ASI 1600mm – Cool camera.

    Software: SGP, PHD2, APP & PI.

    15x RGB @ 120 sec. (gain 139, offset 21)
    24x Ha @ 900 sec. (gain 139, offset 21)
    36x SII @ 300 sec. (gain 300, offset 50)

    IC 5146 (also Caldwell 19, Sh 2-125, and the Cocoon Nebula) is a reflection[1]/emission[2] nebula and Caldwell object in the constellation Cygnus. The NGC description refers to IC 5146 as a cluster of 9.5 mag stars involved in a bright and dark nebula. The cluster is also known as Collinder 470.[3] It shines at magnitude +10.0[4]/+9.3[2]/+7.2.[5] Its celestial coordinates are RA 21h 53.5m, dec+47° 16′. It is located near the naked-eye star Pi Cygni, the open cluster NGC 7209 in Lacerta, and the bright open cluster M39.[1][4] The cluster is about 4,000 ly away, and the central star that lights it formed about 100,000 years ago;[6] the nebula is about 12 arcmins across, which is equivalent to a span of 15 light years.[5]

    When viewing IC 5146, dark nebula Barnard 168 (B168) is an inseparable part of the experience, forming a dark lane that surrounds the cluster and projects westward forming the appearance of a trail behind the Cocoon.

    • 3 people like this.
    #16432

    KeesScherer
    Participant
    posts: 1486

    Leuk, hiervoor verzamel ik in deze periode ook data. Wat is de bijdrage van S-II (672.4 nm) aan het beeld Rob? In de wijdere omgeving geeft Ha (656.3 nm) een duidelijke verdieping (buiten de duidelijke Ha bijdrage aan de nevel zelf), maar alleen na flinke integratietijd.

    #16434

    Musquetier
    Participant
    posts: 502

    Vooralsnog zag ik veel overlap in het Ha en SII gebied in de stacks, alleen SII was veel zwakker…

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