Owl Nebula

105. Owl Nebula


Position not available. Multiple objects or no NGC/IC designation
 

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The Owl Nebula (also known as Messier 97, M97 or NGC 3587) is a starburst ("planetary") nebula approximately 2,030 light years away in the northern constellation Ursa Major. The estimated age of the Owl Nebula is about 8,000 years. It is approximately circular in cross-section with faint internal structure. It was formed from the outflow of material from the stellar wind of the central star as it evolved along the asymptotic giant branch. The nebula is arranged in three concentric shells/envelopes, with the outermost shell being about 20–30% larger than the inner shell. A mildly owl-like appearance of the nebula is the result of an inner shell that is not circularly symmetric, but instead forms a barrel-like structure aligned at an angle of 45° to the line of sight.The nebula holds about 0.13 solar masses (M☉) of matter, including hydrogen, helium, nitrogen, oxygen, and sulfur; all with a density of less than 100 particles per cubic centimeter. Its outer radius is around 0.91 ly (0.28 pc) and it is expanding with velocities in the range of 27–39 km/s into the surrounding interstellar medium.The 14th magnitude central star has passed an apex of its evolution so is condensing to form a white dwarf. It has 55% to 60% of solar mass, is 41 to 148 times solar luminosity (L☉), and has an effective temperature of 123,000 K. The star has been successfully resolved by the Spitzer Space Telescope as a point source that does not show the infrared excess characteristic of a circumstellar disk.
 
Supplementary Image




Supplementary Data or Comments

Here's a crop of the Owl Nebula from the above image.


Main Image Information

Location Texas Star Party
Date May 4 2016
Optics Orion 10 f/3.9
Filters Baader MPCC
Mount Celestron CGE
Camera Nikon D810A
ISO 1600
Subexposures 10
Exposure Length 300
Guider KwikGuider
 

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All images copyright © 2006-2021, Rick Saunders
Main text descriptions sourced from Wikipaedia.
Sky position information is based on IP geolocation and is therefore approximate.