Daily Archives: February 2, 2015

Arp 78, Peculiar Galaxy in Aries


Around 200,000 light years in diameter, NGC 772 is twice the size of the Milky Way Galaxy, and is surrounded by several satellite galaxies – including the dwarf elliptical, NGC 770 – whose tidal forces on the larger galaxy have likely caused the emergence of a single elongated outer spiral arm that is much more developed than the others arms. Peculiar spiral galaxy Arp 78 is found within the boundaries of the head strong constellation Aries, some 100 million light-years beyond the stars and nebulae of our Milky Way galaxy. Also known as NGC 772, the island universe is over 100 thousand light-years across and sports a single prominent outer spiral arm.

Imaging telescopes or lenses: GSO RC12
Imaging cameras: Atik 4000
Mounts: Paramount MX
Focal reducers: CCDT67
Software: PixInsight
Resolution: 1592×1708
Dates: Oct. 19, 2014,  Oct. 22, 2014,  Oct. 23, 2014,  Oct. 24, 2014
B: 24×450″ bin 2×2
G: 27×450″ bin 2×2
L: 61×900″ bin 1×1
R: 20×450″ bin 2×2
Integration: 24.1 hours
Avg. Moon age: 20.36 days
Avg. Moon phase: 6.53%
RA center: 29.837 degrees
DEC center: 19.017 degrees
Pixel scale: 0.957 arcsec/pixel
Orientation: 176.833 degrees
Field radius: 0.310 degrees
Locations: Remote observatory at Astrocamp, Nerpio, Spain
Author: Salvatore Iovene