About image
NGC 2841 is one of the largest and brightest galaxies in Ursa Major: its has angular size 8.1x3.5’ and magnitude 9.5., while its estimated distance is 47 million light years.
Its spiral-arm structure is marked by a number of shorter spiral arms fragments that can be seen on the image as flocculent nodules around the galaxy just a little brigter than the sky.
Several others faint background galaxies are visible in the field.
Technical data
Optic GSO RC12 Truss - Aperture
304mm, focal lenght 2432mm, f/8
Mount 10Micron GM2000 HPSII
Camera ZWO ASI 2600 MM Pro with filter wheel 7 positions
Filters Astrodon Gen2
E-Serie Tru-Balance 50mm unmounted LRGB
Guiding system ZWO OAG-L with guide camera ASI 174MM
Exposure details L 47x300" bin3 -15C
R 17x300" bin3 -15C
G 15x300" bin3 -15C
B 16x300" bin3 -15C
Total integration 7h55'
Acquisition Voyager, PHD2
Processing Pixinsight 1.8,
Photoshop CS5, StarXTerminator, NoiseXTerminator, BlurXTerminator
SQM-L 21.2
Location Promiod (Aosta
Valley, Italy), own remote observatory
Date 11/12 February 2023