Community Work: The Dolphin Nebula - Sh2-308
Sh2-308, The Dolphin Nebula HII region observed and processed by the Telescope Live Community
Sh2-308, also designated as Sharpless 308, RCW 11, or LBN 1052,is located near the center of the constellation Canis Major, composed of ionised hydrogen.
It is about 8 degrees south of Sirius, the brightest star in the night sky.
The nebula is bubble-like (hence its common name, the Cosmic Bubble – though more commonly known now as the Dolphin Nebula), surrounding a Wolf–Rayet star named EZ Canis Majoris.
This star is in the brief, pre-supernova phase of its stellar evolution. The nebula is about 4,530 light-years away from Earth, but some sources indicate that both the star and the nebula are up to 5,870 light years away. Yet others indicate the nebula is as close as 1,875 light years from Earth.
Sh2-308 surrounds the Wolf–Rayet star EZ Canis Majoris, also designated EZ CMa or WR 6. Its apparent magnitude varies from 6.71 to 6.95. Its spectral type indicates that the star is very hot and luminous. The spectrum shows that it is devoid of hydrogen at the surface. EZ Canis Majoris is expected eventually to explode in a supernova, therefore subsuming the nebula.
"This data was captured during a 99% illuminated Moon in the sky. This is 90 mins of Ha and Oiii data presented in HOO palette. It came out descent considering it’s short exposure and having a blasting moon in the sky. It did have quite some noise but oh well. I hope to shoot this awesome thing again when I upgrade my rig.
Total Exposure: 90 mins
Ha: 5 x 600s
Oiii: 4 x 600s
Follow @the.z.axis on instagram for more of my work."
Acquisition: Advanced Request + One Click Observation
Telescope: ASA 500N (CHI-4)
Filters: Astrodon H-alpha; OIII
Processing: Astro Pixel Processor, Photoshop CC incl. AstroPanel V4.2, Astronomy Tools and Denoise Projects 3
"This image was captured with the ASA500N telescope and FLI PL16803 camera from Telescope Live in El Sauce Observatory, Chile.
Combined my own data from an advanced request with data from a one-click observation
Total exposure time was 80 minutes: 4 sub-frames of 600s with both H-alpha and OIII filters were used to create this HOO-image. The relatively faint emission captured in this image is dominated by the glow of ionized oxygen atoms (blue hue)."
Lum - Synthetic Luminance
Halpha - 4x600s
OIII - 5x600s
"The nebula itself is very strong in the O3 channel and hardly can be seen in the Ha channel. It encapsulates a Wolf-Rayet star named EZ Canis Majoris, a star in its pre-supernova phase.
@rune_astrostuff on instagram for more images :) Thanks to all people of Telescope.Live"
HOO 1hour of data
"@rune_astrostuff on instagram for more images :) Thanks to all people of Telescope.Live"
"Here is the Dolphin Nebula taken with a combination of the one click observations in February and an advanced request I made. "
"An advanced request I did on CH5. I did a pretty heavy crop due to reflections. Now 100% happy with how it turned out, but when your processing skills hit a wall, they hit a wall"
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