Arp 273
About image
Arp 273 is a couple of interacting galaxies in Andromeda constellation, at the distance of 345 million light years.
The name comes from the fact that they were catalogued at position 273 in the "Atlas of Peculiar Galaxies" compiled by Halton Arp in 1966: the two galaxies are catalogued also as UGC 1810 (the bigger one) and UGC 1813 (the smaller one).
UGC 1810 is seen face-on, with very narrow spiral arms which turn into tidal tails, with the outer ring-shaped structure making almost a complete revolution around the galaxy.
UGC 1813 is seen more edge-on and in high resolution images shows active regions with young stars. so it is supposed that in the past it has already passed through UGC 1810.
The image is a crop of the original frame as the two galaxies are very small: UGC 1810 has dimensions only 1.9'x1.3'.
Several other remote galaxies are visible in the background.
Technical data R 19x300" bin3 -15C all gain 100
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 40x300" bin3 -15C
G 20x300" bin3 -15C
B 20x300" bin3 -15C
Total integration 8h5'
Acquisition Voyager, PHD2
Processing Pixinsight 1.8, Photoshop CS5, StarXTerminator, NoiseXTerminator, BlurXTerminator
SQM-L 21.08
Location Promiod (Aosta Valley, Italy), own remote observatory
Date 29/30 November 2024
© Roberto Marinoni 2019 - All rights reserved