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.
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
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
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
Australia, Central Victoria
Imaged from May-June 2017