Community Work: The Dolphin Nebula - Sh2-308

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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.

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Dolphin-Head Nebula (sh2-308) by Zubuyer Kaolin

Dolphin-Head Nebula (sh2-308) by Zubuyer Kaolin

Acquisition: Advanced Request
Telescope: ASA 500N (CHI-4)
Filters: Astrodon Ha (3nm), OIII (3nm)
Processing: ProcessingDSS, Photoshop

"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."
Zubuyer

Dolphin Nebula ( Sh2-308) by Amal Biju

Dolphin Nebula ( Sh2-308) by Amal Biju

Acquisition: One Click Observation
Telescope: ASA 500N (CHI-4)
Filters: Astrodon Ha, OIII
Processing: ProcessingPhotoshop, Lightroom 

The Blue Dolphin Nebula By Jan Scheers

The Blue Dolphin Nebula By Jan Scheers

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).
"
Jan Scheers

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Dolphin Nebula by Joe Fonseca

Dolphin Nebula by Joe Fonseca

Acquisition: One Click Observation
Telescope: ASA 500N (CHI-4)
Filters: Hydrogen Alpha, SIII
Processing: Nebulosity 4, Photoshop, Annie's Astro Actions

Sh2-308 (Dolphin Head Nebula) by Yovin Yahathugoda

Sh2-308 (Dolphin Head Nebula) by Yovin Yahathugoda

Acquisition: Advanced Requiest
Telescope: CHI-4 + CHI-2
Filters: Ha & OIII
Processing: PixInsight and PhotoshopCredits 

Acquired through CHI-2 & CHI-4 using the Advanced request feature. The image was processed in the HOO palette with star colors slightly modified.

Lum - Synthetic Luminance
Halpha - 4x600s
OIII - 5x600s

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Sh2-308 Wolf Rayet Star by Fernando Diego

Sh2-308 Wolf Rayet Star by Fernando Diego

Acquisition: One Click Observation
Telescope: ASA 500N (CHI-4)
Filters: Ha and OIII
Processing: PixInsight LE and Photoshop

Open SH2-308 by Rune Matthijssens

Open SH2-308 by Rune Matthijssens

Acquisition: One Click Observation
Telescope: AUS-2
Filters: O3 1x600s Ha 1x600s Astrodon 3nm
Processing: Siril, GIMP, Lighroom mobile, Starnet ++

"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"
Rune

Acquisition: 3 One-Click Observations
Telescope: AUS-2
Filters: O3 Ha Astrodon 3nm
Processing: Siril, GIMP, Lighroom mobile, Starnet ++

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HOO 1hour of data

"@rune_astrostuff on instagram for more images :) Thanks to all people of Telescope.Live"
Rune

Sh2-308 The Dolphin Nebula by Scotty Bishop

Sh2-308 The Dolphin Nebula by Scotty Bishop

Acquisition: Advanced Requiest + One Click Observation
Telescope: AUS-2
Filters: HSO
Processing: APP and Photoshop

"Here is the Dolphin Nebula taken with a combination of the one click observations in February and an advanced request I made. "
Scotty

Open SH2-308 by Scotty Bishop

Open SH2-308 by Scotty Bishop
Open SH2-308 by Scotty Bishop

Acquisition: Advanced Request
Telescope: CHI-5
Filters: Ha, Oiii, LRGB
Processing: APP and Photoshop

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"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"
Scotty

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