Abell 35
Published 10 May 2022

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Full image field here: full resolution 1920x1200 resolution

About this object

Abell 35, also known as Sh2-313 is a questionable planetary nebula in the constellation Hydra. Abell 35 was always thought to be an old planetary nebula 1200 light years distant. Recent studies, however, suggest that this object may be what's called a Stromgren Sphere. The object exhibits a strong bow shock especially in the OIII spectrum as can be seen in the bluish/green center. This bow shock is not very evident in the Ha spectrum. The central star at the head of the bow shock is also not necessarily hot enough to ionize the area. The star is of a G8 spectral type. So researchers think this is a hybrid type nebula that is being powered by an unseen very hot star or pair of hot star. What ever the experts finally decide, this is an interesting and colorful object. Within the back ground are many galaxies too. See the annotated image to identify them. Many others are also uncatalogued. The image is a crop of a larger field of view and was taken between the end of Jan into late April 2022.
Image Details

  • Optics : Stellarvue SVX 152T refractor @f8 1200mm FL
  • Mount: Paramount MYT
  • Camera: ZWO ASI6200
  • Filters: Chroma 50mm RGB 5nm OIII, Astrodon 5nm Ha
  • Exposure (min): RGB 150:140:150:920:820 36.3 hrs, 2x2 binning
  • Automation Control: The Sky X, Voyager, PrimaluceLab Eagle 4
  • Guiding: StarlightXpress Lodestar X2
  • Processing Software: PixInsight, PS CC
  • Location: Stark Bayou Observatory, Ocean Springs, MS
  • Sky: Typical SQM 19.6-20.1, Bortle 5, Suburban
  • Date: 29 Jan - 26 Apr 2022
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