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NGC 247 – Interesting void within an intermediate spiral Galaxy

Terry Robison #59537 NGC 247 – Interesting void within an intermediate spiral Galaxy NGC 247 is an intermediate spiral Galaxy located in the constellation Cetus. It is a member of the sculptor group and is located approximately 11.1 million light years away. The most striking feature of this Galaxy, the void, contain stars that are different from those around. They are older, redder and colour, and much fainter. This suggests that the star formation within the void has been arrested. It is believed that star formation slowed a billion years ago. We are still unsure how the void has formed. Recent studies suggest it might have been caused by gravitational interactions with another galaxy, or even a recent interaction with a nearly dark subhalo that collided with the disc. The centre of the Galaxy is visible as a bright whitish patch surrounded by mixture of stars, gas, and dust. Silhouetted against the background of stars the dust and gas has formed interesting filaments. The best month for viewing NGC 247 is in November when it is at its highest altitude. It has an apparent magnitude of 9.9, and an apparent size of 21'.4 × 6'.9. NGC247 is also known as ESO 540-22, C 62, IRAS 00446-2101, MCG -4-3-5, PGC 2758, UGCA 11. https://www.flickr.com/photos/97807083@N00/24330831247/ Image Details Center (RA, hms): 00h 47m 19.577s Center (Dec, dms): -20° 43' 59.305" Size: 47.8 x 31.8 arcmin Radius: 0.478 deg Pixel scale: 0.804 arcsec/pixel Orientation: Up is 118 degrees E of N Instruments: 10 Inch RCOS fl 9.1 Astro Physics AP-900 Mount SBIG STL 11000m FLI Filter Wheel Astrodon Lum, Red, Green, Blue Filters Baader Planetarium H-alpha 7nm Narrowband-Filter Exposure Details: 37 X 900 Bin 1X1 Lum 21 X 450 Bin 2X2 Red 21 X 450 Bin 2X2 Green 22 X 450 Bin 2X2 Blue 13 X 900 Bin 1X1 Ha Total time: 20.5 hours Location Australia, Central Victoria Imaged from May-June 2017
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Gregg Ruppel #59540 Excellent rendition Terry. Your extended integration times were well worth the effort. Thanks for sharing and the accompanying details. Gregg Visit my astronomy & astrophotography site www.greggsastronomy.com toggle quoted messageShow quoted text On Dec 21, 2017, at 2:47 AM, terry.robison@... [ap-gto] <ap-gto@...> wrote: NGC 247 – Interesting void within an intermediate spiral Galaxy NGC 247 is an intermediate spiral Galaxy located in the constellation Cetus. It is a member of the sculptor group and is located approximately 11.1 million light years away. The most striking feature of this Galaxy, the void, contain stars that are different from those around. They are older, redder and colour, and much fainter. This suggests that the star formation within the void has been arrested. It is believed that star formation slowed a billion years ago. We are still unsure how the void has formed. Recent studies suggest it might have been caused by gravitational interactions with another galaxy, or even a recent interaction with a nearly dark subhalo that collided with the disc. The centre of the Galaxy is visible as a bright whitish patch surrounded by mixture of stars, gas, and dust. Silhouetted against the background of stars the dust and gas has formed interesting filaments. The best month for viewing NGC 247 is in November when it is at its highest altitude. It has an apparent magnitude of 9.9, and an apparent size of 21'.4 × 6'.9. NGC247 is also known as ESO 540-22, C 62, IRAS 00446-2101, MCG -4-3-5, PGC 2758, UGCA 11. https://www.flickr.com/photos/97807083@N00/24330831247/ Image Details Center (RA, hms): 00h 47m 19.577s Center (Dec, dms): -20° 43' 59.305" Size: 47.8 x 31.8 arcmin Radius: 0.478 deg Pixel scale: 0.804 arcsec/pixel Orientation: Up is 118 degrees E of N Instruments: 10 Inch RCOS fl 9.1 Astro Physics AP-900 Mount SBIG STL 11000m FLI Filter Wheel Astrodon Lum, Red, Green, Blue Filters Baader Planetarium H-alpha 7nm Narrowband-Filter Exposure Details: 37 X 900 Bin 1X1 Lum 21 X 450 Bin 2X2 Red 21 X 450 Bin 2X2 Green 22 X 450 Bin 2X2 Blue 13 X 900 Bin 1X1 Ha Total time: 20.5 hours Location Australia, Central Victoria Imaged from May-June 2017
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Stuart Heggie <stuart.j.heggie@...> #59558 Terry, that is a gorgeous shot! The time invested clearly paid off. Stuart toggle quoted messageShow quoted text On Thu, Dec 21, 2017 at 4:47 AM, terry.robison@... [ap-gto] <ap-gto@...> wrote: NGC 247 – Interesting void within an intermediate spiral Galaxy NGC 247 is an intermediate spiral Galaxy located in the constellation Cetus. It is a member of the sculptor group and is located approximately 11.1 million light years away. The most striking feature of this Galaxy, the void, contain stars that are different from those around. They are older, redder and colour, and much fainter. This suggests that the star formation within the void has been arrested. It is believed that star formation slowed a billion years ago. We are still unsure how the void has formed. Recent studies suggest it might have been caused by gravitational interactions with another galaxy, or even a recent interaction with a nearly dark subhalo that collided with the disc. The centre of the Galaxy is visible as a bright whitish patch surrounded by mixture of stars, gas, and dust. Silhouetted against the background of stars the dust and gas has formed interesting filaments. The best month for viewing NGC 247 is in November when it is at its highest altitude. It has an apparent magnitude of 9.9, and an apparent size of 21'.4 × 6'.9. NGC247 is also known as ESO 540-22, C 62, IRAS 00446-2101, MCG -4-3-5, PGC 2758, UGCA 11. https://www.flickr.com/photos/97807083@N00/24330831247/ Image Details Center (RA, hms): 00h 47m 19.577s Center (Dec, dms): -20° 43' 59.305" Size: 47.8 x 31.8 arcmin Radius: 0.478 deg Pixel scale: 0.804 arcsec/pixel Orientation: Up is 118 degrees E of N Instruments: 10 Inch RCOS fl 9.1 Astro Physics AP-900 Mount SBIG STL 11000m FLI Filter Wheel Astrodon Lum, Red, Green, Blue Filters Baader Planetarium H-alpha 7nm Narrowband-Filter Exposure Details: 37 X 900 Bin 1X1 Lum 21 X 450 Bin 2X2 Red 21 X 450 Bin 2X2 Green 22 X 450 Bin 2X2 Blue 13 X 900 Bin 1X1 Ha Total time: 20.5 hours Location Australia, Central Victoria Imaged from May-June 2017 -- Stuart Heggie http://www.stuartheggie.com/featured.html
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