NGC 772 (Arp 78, UGC 1466) - unbarred galaxy type Sb in Aries.

LRGB combination 100% crop - (Click for a larger view 1800 px x 1350 px)



LRGB combination - mousover to see description


Inverted B/W - 100% crop



NGC 772 (Arp 78, UGC 1466) - unbarred galaxy type Sb in Aries

Discovered by William Herschel in 1785.

NGC 772 (also known as a peculiar spiral galaxy Arp 78) is an unbarred giant spiral galaxy approximately 106 million light-years away in the constellation Aries. It is notable for possessing a single elongated outer spiral arm. The asymmetric spiral arms are distorted by interaction with the dwarf elliptical galaxy NGC 770. NGC 770 appears to be at about the same distance as NGC 772, so it is most likely a true companion to the larger spiral system. It has a separation of only 160 000 light-years from its larger companion with an actual diameter of only about 40 000 light-years. NGC 772 is huge, having a diameter of 208 000 lightyears, making it twice the diameter of our Milky Way Galaxy. Stars stewn outward from NGC 770 appear as a fine haze extending away from the pair. NGC772 is surrounded by several satellite galaxies and additonally, this field has many smaller galaxies.

At least two supernovae have appeared in this galaxy: sn2003hl and sn2003iq. Each of these supernovae was a type II supernova. Both of them were visible during the same period of time.

North is up. The Horizontal FOV is about 34' (crop from original FOV). The image almost centered at:

Right Ascension 01:59:19.68 (h:m:s)
Declination +19:00:28.2 (deg:m:s)
Distance 106 000 (kly)
Visual Brightness B=11.3, V=10.3 (mag)
Apparent Dimension 7.413' x 4.897' (arc min)

Optic(s): RC 12" with Astro-Physics corrector @ f/5
Mount: ASA DDM85 Premium
Camera: ATIK 4000 - monochrome CCD – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomik LRGB set, SupaSlim TrueTechnology Computerized Filter Wheel
Dates/Times: 2012-08-24
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

L = 90 min, R = 50 min, , G = 50 min, , B = 50 min, subs. 10 min, Bin 1, Total Exposure Time - 240 min

More details: Dark and flat frames reduction
Guiding: All subexposures are unguided thanks to ASA DDM85 Premium mount

PixInsight / PS


All Contents copyright Velimir Popov unless otherwise noted.