Hemisphere:  Southern  ·  Contains:  The star ο1CMa
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The Dolphin Head Nebula (Sh-2 308), 


            Peter Dunsby
The Dolphin Head Nebula (Sh-2 308)
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The Dolphin Head Nebula (Sh-2 308)

Technical card

Imaging telescopes or lenses: Celestron RASA 8" F/2

Imaging cameras: ZWO ASI1600MM Pro

Mounts: Skywatcher EQ6-R Pro

Guiding telescopes or lenses: PrimaLuceLab 60mm guidescope

Guiding cameras: ZWO ASI120MM

Software: Stark Labs Nebulosity 4.1  ·  Seqence Generator Pro  ·  PHD2  ·  Pixinsight

Filters: Baader high speed OIII  ·  Baader high speed Ha

Accessory: Primaluce Labs Eagle 3

Dates:April 16, 2020

Baader high speed Ha: 150x120" (gain: 75.00) -10C bin 1x1
Baader high speed OIII: 300x60" (gain: 75.00) -10C bin 1x1

Integration: 10.0 hours

Darks: ~50

Flats: ~50

Flat darks: ~50

Avg. Moon age: 23.59 days

Avg. Moon phase: 34.90%

Bortle Dark-Sky Scale: 8.00

Basic astrometry details

Astrometry.net job: 3479503

RA center: 6h 54' 25"

DEC center: -23° 51' 7"

Pixel scale: 1.970 arcsec/pixel

Orientation: 91.502 degrees

Field radius: 0.798 degrees

Resolution: 2332x1749

Data source: Backyard


⁣The Dolphin Head Nebula (Sh 2-308) is probably the most challenging target I’ve ever imaged over the past two years, particularly at this time of year when it’s already past the meridian at the start of each session. I spent 6 nights in total, acquiring a total of 10 hours of data (5 hours of Ha and 5 hours of OIII). It’s faint, really really faint!!! Most of the signal is in OIII and even there, it’s difficult to see it in the individual subframes. I’ll definitely have another go next year, starting much earlier in the year. Hope you enjoy the image. ⁣



Peter Dunsby
License: None (All rights reserved)

Sky plot

Sky plot


The Dolphin Head Nebula (Sh-2 308), 


            Peter Dunsby