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.
This image has been awarded by NASA as Astronomical Picture Of the Day (APOD) for the day 23 March 2023 - https://apod.nasa.gov/apod/ap230323.html
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