OBJECT
NGC7479 is a barred galaxy with very distorted arms.
Sir William Herschel discovered the galaxy on 19th October 1784. He entered his discovery as number 55 under the category of “First class. Bright nebulae”
One century later, New General Catalogue, published in 1888 by Danish-Irish astronomer John Louis Emil Dreyer assigned the definitive NGC7479 designation to the galaxy.
NGC 7479 hosts a remarkable (~40000 light year) jet when observed on radio wavelengths. It suggests that the galaxy has recently suffered a merger with another galaxy.
The object is known by the nickname of ‘The propeller galaxy’ because of its twisted arms suggesting that shape.
NGC7479 is not an easy galaxy to imaging due to its low surface bright and small size (3′ x 4′).
Small galaxies (~18 magnitude) are in the image background.
TECH DATA
Optics: Ritchie-Chretien RC14 f/8 scope
Camera: SBIG STL-6303
Exposure details:
NGC 7479 image is a LRGB composition of:
– Luminance: 22 images, 600 seconds each using L filter (binning 1x1) (220 minutes)
– Red channel: 20 images, 600 seconds each using R filter (binning 2x2) ( 100 minutes)
– Green channel: 19 images, 600 seconds each using G filter (binning 2x2) (190 minutes)
– Blue channel: 19 images, 600 seconds each using B filter (binning 2x2) (190 minutes)