Sivan 5 & 6 - Seadog Nebula
Sivan 5 & 6 - Seadog Nebula
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Sivan 5 & 6 - Seadog Nebula

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"The first color image to feature Sivan 5 and Sivan 6?


I believe this is the first successful color image of the nebulae Sivan 5 and Sivan 6. Siv 5 is the larger mass at the top. Siv 6 lies beneath it and includes Sh2-287, the bright section at bottom-center. The swooping red wisp that stretches from the left to right and looks like a ship's hull isn't officially part of either nebula.


Astronomer J.P. Sivan identified these forgotten nebulae in 1974 from an Hα survey of the Milky Way in which they appeared as a couple of tiny, irregular blots. Apparently, no one has bothered with them since.


Sivan nebulae are large and exceedingly faint: this image spans over 5° of the constellation Monoceros; and total exposure time is 74 hours with the narrowband filters. This area has been photographed before, but always with far less exposure time. Thus, they scarcely reveal these Sivan objects at all, not that anyone was looking for them. In fact, even the small, brighter Sharpless objects in this image barely appear in most other widefield images.


…Speaking of blots, in the cosmic Rorschach ink blot test that is interstellar space, to me this looks like a dog (or seal) sitting in a boat with a single sail. So, I call this The Seadog Nebula."


A metallic paper print of Sivan nebulae in the constellation Monoceros. Photographed by J K Lovelace.


Each print is Made-To-Order.




MOAB Slickrock Metallic Pearl 260 gsm paper, acid free. From the maker's website: “Slickrock Metallic Pearl 260 transforms an image into life like, almost 3D quality.”

Technical Info


Total Integration Time: 75.87 hours

  • Takahashi FSQ-106 EDX4 on a Software Bisque Paramount MyT
  • Stellarvue F50 guider
  • FLI ML-16070M camera
  • ZWO ASI 174 Mini M guide camera
  • Optec Gemini focusing rotator
  • Astrodon filters


For more technical information click here.