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A region of nebulosity that lies along the border between the constellations Monoceros and Canis Major and is close to Sirius, the brightest star in the night sky . The nebula lies more than four hundred times further away than that famous star. It is a roughly circular H II region centered on the Be star HD 53367. Although a small bright clump in the Seagull Nebula complex was observed for the first time by the German-British astronomer Sir William Herschel back in 1785, the greater part had to await photographic discovery about a century later. This was discovered by Welsh amateur astronomer Isaac Roberts and was described by him as, "pretty bright, extremely large, irregularly round, very diffuse."
The name Seagull Nebula is sometimes applied by amateur astronomers to this emission region, which also includes the neighboring regions of star clusters, dust clouds and reflection nebulae. This latter region includes the open clusters NGC 2335 and NGC 2343.
The complex of gas and dust that forms the head of the seagull glows brightly in the sky due to the strong ultraviolet radiation coming mostly from one brilliant young star — HD 53367 — that can be spotted in the upper right quadrant of the image and could be taken to be the seagull’s eye.
Imaging telescopes or lenses: Takahashi FSQ130ED
Imaging cameras: QSI 6120
Mounts: Takahashi EM 400 Temma 2M
Guiding telescopes or lenses: Takahashi FS60CB
Guiding cameras: QHY CCD QHY 5 II
Focal Extender / Reducer: Tak QE 0.73X Reducer
Software: PHD 2, Pleiades Astrophoto PixInsight , Astro Pixel Processor (for stacking), Sequence Generator Pro SGP (for capture)
Filters: Astrodon Ha (3nm), Astrodon OIII (3nm) & Astrodon SII (3nm),
Accessories: Robofocus Focuser, ATIK EFW3
Original Resolution: 3500 x 2400
Dates: 3rd Feb to 9th Feb. '20
Frames:
Astrodon Ha 20 x 15'
Astrodon OIII 20 x 15'
Astrodon SII 20 x 15'
Total Time: 15 Hours.
Center (RA, Dec):(106.650, -10.521)
Center (RA, hms):07h 06m 36.013s
Center (Dec, dms):-10° 31' 14.579"
Size:78.4 x 53.8 arcmin
Radius:0.793 deg
Pixel scale:1.34 arcsec/pixel
Orientation:Up is 23.4 degrees E of N
The name Seagull Nebula is sometimes applied by amateur astronomers to this emission region, which also includes the neighboring regions of star clusters, dust clouds and reflection nebulae. This latter region includes the open clusters NGC 2335 and NGC 2343.
The complex of gas and dust that forms the head of the seagull glows brightly in the sky due to the strong ultraviolet radiation coming mostly from one brilliant young star — HD 53367 — that can be spotted in the upper right quadrant of the image and could be taken to be the seagull’s eye.
Imaging telescopes or lenses: Takahashi FSQ130ED
Imaging cameras: QSI 6120
Mounts: Takahashi EM 400 Temma 2M
Guiding telescopes or lenses: Takahashi FS60CB
Guiding cameras: QHY CCD QHY 5 II
Focal Extender / Reducer: Tak QE 0.73X Reducer
Software: PHD 2, Pleiades Astrophoto PixInsight , Astro Pixel Processor (for stacking), Sequence Generator Pro SGP (for capture)
Filters: Astrodon Ha (3nm), Astrodon OIII (3nm) & Astrodon SII (3nm),
Accessories: Robofocus Focuser, ATIK EFW3
Original Resolution: 3500 x 2400
Dates: 3rd Feb to 9th Feb. '20
Frames:
Astrodon Ha 20 x 15'
Astrodon OIII 20 x 15'
Astrodon SII 20 x 15'
Total Time: 15 Hours.
Center (RA, Dec):(106.650, -10.521)
Center (RA, hms):07h 06m 36.013s
Center (Dec, dms):-10° 31' 14.579"
Size:78.4 x 53.8 arcmin
Radius:0.793 deg
Pixel scale:1.34 arcsec/pixel
Orientation:Up is 23.4 degrees E of N
Sky Map
Ha, SII & OIII in the final image
Annotated Image
