Celestial hemisphere:  Northern  ·  Constellation: Perseus (Per)  ·  Contains:  HD21060  ·  HD21108  ·  PK149-09.1

Image of the day 12/27/2022

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    Hartl-Dengel-Weinberger 3: An exceedingly faint ancient planetary nebula, Luca Marinelli
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    Hartl-Dengel-Weinberger 3: An exceedingly faint ancient planetary nebula

    Image of the day 12/27/2022

    Getting plate-solving status, please wait...
      Hartl-Dengel-Weinberger 3: An exceedingly faint ancient planetary nebula, Luca Marinelli
      Powered byPixInsight

      Hartl-Dengel-Weinberger 3: An exceedingly faint ancient planetary nebula

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      Description

      Hartl-Dengel-Weinberger 3 (HDW 3, PK149.09-1, PN G149.4-09.2) is an extremely faint and rarely imaged ancient planetary nebula in the constellation Perseus. The progenitor star is the blue star at 4 o'clock position from the bright central yellow star. The progenitor star is not centrally located due to the fast motion in a northwesterly directory of the PN through the interstellar medium, which also leads to the braided appearance at the shock front.

      I used roughly 85 hours of data for this image and ended up rejecting roughly 35 hours of data. Data collected with any amount of high cirrus that would be adequate if properly weighted for brighter targets would contaminate the extremely faint signal of this target. To put it in context, the brightest portions of the nebula and surrounding hydrogen clouds that circle HDW3 are 5 ADU above the noise floor after averaging the narrowband channels for ~40 hours.

      The image is presented in HOO combination. Color of the nebula was calibrated with the SPCC PixInsight process and enhanced with slight saturation curves but minimal shift. RGB stars were used to replace narrowband  ones. Small background galaxies can be seen across the image.

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