Bubble Nebula, a rare type of nebula, is an emission nebula in the constellation Cassiopeia. Although it looks delicate, the 7 light-year diameter bubble offers evidence of violent processes at work. Just left of the Bubble’s center is a hot, O-type star, several hundred thousand times more luminous and around 45 times more massive than the Sun. The “bubble” is created by the stellar wind from a massive hot, 8.7 magnitude young central star. It is about 9000 light years away in the outer spiral arm of our galaxy.
I have taken this image before but it wasn’t crisp enough so I added some more exposures to the original image and then came up with this one. Definitely better than the previous one. The total time is 20 hours (47 images of 20 minutes each for Luminance and for each color (Red, Green & Blue), it is 21 images of 12 minutes each).
Couple of years back, I took this image in narrowband (i.e Hydrogen Alpha, Oxygen & Sulphur) and gave false colors based on my discretion.
Exposure time – 12+ hours (Hydrogen Alpha – 15, Oxygen – 13 & Sulphur – 9 images of 20 minutes each).