Hemisphere:  Southern  ·  Constellation: Canis Major (CMa)  ·  Contains:  The star ο1CMa
Dolphin Head Nebula (SH2-308) HOO + RGB stars, 



    
        

            Jian Yuan Peng
Dolphin Head Nebula (SH2-308) HOO + RGB stars
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Dolphin Head Nebula (SH2-308) HOO + RGB stars

Dolphin Head Nebula (SH2-308) HOO + RGB stars, 



    
        

            Jian Yuan Peng
Dolphin Head Nebula (SH2-308) HOO + RGB stars
Powered byPixInsight

Dolphin Head Nebula (SH2-308) HOO + RGB stars

Equipment

Imaging Telescopes Or Lenses
TEC 160FL
Imaging Cameras
ZWO ASI6200MM Pro
Mounts
Astro-Physics Mach 2 GTO
Filters
Astrodon 3nm Ha · Astrodon 3nm OIII · Astrodon Gen2 Green · Astrodon 3nm Narrowband filters · Astrodon Tru-Balance Gen 2 - E-Series LRGB · Astrodon Gen2 Blue · Astrodon Gen2 Red
Accessories
ZWO Off-Axis Guider · Tec frc 0.9x Tec frc
Software
My Software PHD2, PixInsight, Lightroom 6.4, Sequence Generator Pro, Photoshop CS6, StarNet++, Topaz Lab DeNoiseAI
Guiding Telescopes Or Lenses
TEC 160FL
Guiding Cameras
ZWO ASI290MM Guide Camera

Acquisition details

Dates:
Feb. 22, 2021 ·  Feb. 23, 2021 ·  Feb. 24, 2021 ·  Feb. 26, 2021 ·  Feb. 27, 2021 ·  March 12, 2021 ·  March 13, 2021
Frames:
Astrodon 3nm Ha: 22x1200" (7h 20') (gain: 0.00) -10°C bin 1x1
Astrodon 3nm Ha: 12x900" (3h) (gain: 0.00) -10°C bin 1x1
Astrodon 3nm OIII: 37x1200" (12h 20') (gain: 0.00) -10°C bin 1x1
Astrodon 3nm OIII: 9x900" (2h 15') (gain: 0.00) -10°C bin 1x1
Astrodon Gen2 Blue: 35x60" (35') (gain: 0.00) -10°C bin 1x1
Astrodon Gen2 Green: 43x60" (43') (gain: 0.00) -10°C bin 1x1
Astrodon Gen2 Red: 36x60" (36') (gain: 0.00) -10°C bin 1x1
Integration:
26h 49'
Darks:
32
Flats:
32
Bias:
128
Avg. Moon age:
12.85 days
Avg. Moon phase:
64.08%
Bortle Dark-Sky Scale:
7.00

Basic astrometry details

Astrometry.net job: 4329829

RA center: 06h54m15s.6

DEC center: -23°5530

Pixel scale: 0.784 arcsec/pixel

Orientation: 113.050 degrees

Field radius: 0.823 degrees

Resolution: 5466x5220

Locations: CourtYard, Palo Alto, CA, United States

Data source: Backyard

Description

Started this project late and the weather was not cooperating, I tried to integrate and process whatever I acquired data to see the result. This target is about 15 degrees above the horizon from my location plus a Redwood treetop, LED street light, and my house roof between the path, so I was able to collect less than 2.5 hours of workable data at one clear night. This image is the HOO color mapping plus the natural star color using R, G, and B filters.

C & C are welcome.

Thank you!

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About 4,530 to 5,870 light-years away from Earth and at 8 degrees south of Sirius, Dolphin Head Nebula (SH2-308) is an H II region located near the center of the constellation Canis Major(Big Dog). This nebula is a Cosmic Bubble formed about 70,000 years ago by the star EZ Canis Majoris throwing off its outer hydrogen layers by fast stellar winds, revealing inner layers of heavier elements. The blue hue feature in this image is the glow of ionized oxygen atoms. The nebula is approximately 60 light-years across at its widest point and covers slightly more than a Full Moon in the sky.

Technical details:

Telescope: TEC 160FL + TEC FRC 0.9x

Mount: Astro-Physics Mach 2 GTO

Imaging cameras: ZWO ASI6200MM

Software: PHD2, PixInsight, Lightroom 6.4, Sequence Generator Pro, Photoshop CS6

Location: Palo Alto, California, USA

Total Integration: 26.8 Hours

PhotometricColorCalibration data(before crop):

Resolution ............... 0.392 arcsec/px

Rotation ................. -113.083 deg

Observation start time ... 2021-02-22 07:02:07 UTC

Observation end time ..... 2021-03-13 05:14:25 UTC

Focal distance ........... 989.28 mm

Pixel size ............... 1.88 um

Field of view ............ 1d 11' 25.1" x 1d 8' 12.7"

Image center ............. RA: 6 54 15.613 Dec: -23 55 29.32

Filters: Astrodon 50mm Unmounted LRGB Gen2 E-Series Filter Sets

Astrodon 50mm Unmounted 3nm Narrowband Ha, SII, OIII filters

Blue 35x60" 35 Minutes Bin1x1

Green 43x60" 43 Minutes Bin1x1

Red 36x60" 36 Minutes Bin1x1

Ha 12x900" 22x1200" 10.3 Hours Bin1x1

OIII 9x900" 37*1200" 14.5 Hours Bin1x1

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