M 27 – Dumbbell Nebula (SHO)

Dumbbell Nebula
M 27
5/26 – 6/6/2017
Brewsky Observatory, Casa Grande, AZ
Celestron Edge/11, SBig STF8300M, St-i Guider, Astrodon filters
# Exp (min) Filter Bin Net Time (min)
15/14 15 Sulfur II 1×1/2×2 435
26/21 15 HAlpha 1×1/2×2 705
19/14 15 Oxygen III 1×1/2×2 495
18 15 Lum 1×1 270
Total 31.75 hr
Calibrated in Maxim/DL
Aligned, processed with PixInsight
Using the Hubble SHO pallette
The Dumbbell Nebula (also known as Apple Core Nebula, Messier 27, M 27, or NGC 6853) is a planetary nebula in the constellation Vulpecula, at a distance of about 1,360 lig.ht-years.

This object was the first planetary nebula to be discovered; by Charles Messier in 1764.

Like many nearby planetary nebulae, the Dumbbell contains knots. Its central region is marked by a pattern of dark and bright cusped knots and their associated dark tails (see picture). The knots vary in appearance from symmetric objects with tails to rather irregular tail-less objects. Similarly to the Helix Nebula and the Eskimo Nebula, the heads of the knots have bright cusps which are local photoionization fronts.

The central star, a white dwarf, is estimated to have a radius which is 0.055±0.02 R which gives it a size larger than any other known white dwarf. The central star mass was estimated in 1999 by Napiwotzki to be 0.56±0.01 M.