Arp 273 is a pair of interacting galaxies, 300 million light years away in the constellation Andromeda. It was first described in the Atlas of Peculiar Galaxies, compiled by Halton Arp in 1966. The larger of the spiral galaxies, known as UGC 1810, is about five times more massive than the smaller galaxy. It has a disc that is tidally distorted into a rose-like shape by the gravitational pull of the companion galaxy below it, known as UGC 1813. The smaller galaxy shows distinct signs of active star formation at its nucleus, and "it is thought that the smaller galaxy has actually passed through the larger one.
Imaging Telescope: Vixen ED81s f/7.7
Mount: Skywatcher HEQ5 Synscan Pro (belt mod)
Camera: QHY 533M
Filter Wheel: QHY CFW3S-SR
Filters: L,R,G,B
Guiding camera: ZWO ASI120MM Mini (mono)
Guidescope: SkyWatcher EvoGuide 50ED
Constellation: Andromeda
Date: 18-19 August-2023
Location: Sekoulas - Ileia - Greece - Albireo Observatory 2
Sky brightness: B2
Exposure Time:
L: 12x300 sec (gain: 56.00, offset: 12.00) 0°C bin 1×1
R: 12x300 sec (gain: 56.00, offset: 12.00) 0°C bin 1×1
G: 12x300 sec (gain: 56.00, offset: 12.00) 0°C bin 1×1
B: 12x300 sec (gain: 56.00, offset: 12.00) 0°C bin 1×1
Calibration Frames: Darks, Flats, Dark Flats
Acquisition: ACP Expert, MaximDL
Processing: Pixinsight, Photoshop
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