9 January 2017 | The Shark Nebula

The Shark Nebula

Credit & copyright: Sebastiano Recupero | Click image to enlarge or here for full size (6MB)

Image Data

  • Location: Margio Salice, Nebrodi mountains, Italy
  • Date: 1-3 September 2016
  • Camera: QSI 683 wsg8
  • Optics: Takahashi FSQ-106EDX3 @f/3.6
  • Mount: Paramount MyT
  • Filters: Astrodon Gen2 Tru-Balance LRGB
  • Exposure: L:R:G:B – 50:11:12:7 x 600s, total: 13h 30m

LDN 1235, also known as the Shark Nebula, is a molecular cloud in the Cepheus constellation. It is likely an extended red emission (ERE) nebula.

The light coming from this nebula is produced by it’s dust particles being hit by high energy UV radiation. This process is called photoluminescence.

Within LDN 1235’s border there are two reflection nebulae: vdB149 & vdB150 (van den Bergh catalog). The reflection Nebulae are respectively illuminated by the stars BD+72 1018 and HD 210806, both of spectral type B8IV. These stars give the surrounding gas and dust it’s markedly bluish color.

In the field two small galaxies are also visible, PGC67671 and PGC67347. They appear yellowish because their light, crossing the gas and dust along the line of sight, loses part of its spectrum.

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