NGC 7640
About image
NGC 7640 is a barred spiral galaxy in Andromeda constellation.
It has apparent diameter of 10.5’x1.8’ and a magnitude 11.3; its distance from the Earth is 29 million of light years.
Its spiral structure is not so evident due to the angle of view: anyway it can be observed some distortion in the galaxy structure, so it is likely that in the past there was a gravitational interaction with another galaxy.
This is my first image of a galaxy taken with the GSO RC12 OTA: the image shown here is a reprocessing from scratch done in 2025 of the original image taken in 2019.
Technical data
Optic GSO RC12 Truss - Aperture 304mm, focal lenght 2432mm, f/8
Mount 10Micron GM2000 HPSII
Camera Moravian G3-16200 with external filter wheel 7 positions
Filters Astrodon Gen2 E-Serie Tru-Balance 50mm unmounted LRGB
Guiding system OAG Moravian M68 with guide camera Moravian G1-0301
Exposure details L 22x600" bin2 -20C
R 15x300" bin2 -20C
G 15x300" bin2 -20C
B 15x300" bin2 -20C
Total integration 7.4h
Acquisition Voyager, PHD2
Processing Pixinsight 1.8, Photoshop CS5, StarXTerminator, BlurXTerminator, NoiseXTerminator
SQM-L 21.4
Location Promiod (Aosta Valley, Italy), own remote observatory
Date 29 August / 2-3 September 2019
© Roberto Marinoni 2019 - All rights reserved