Arp 61

Posted by dcrowson
on Thursday, February 3, 2022
Arp 61 (top right quadrant) consists of UGC 3104 (PGC 15637 and others) and the smaller companion 2MASX J04363919-0217090 (PGC 213288) that appears to be interacting with it. Part of Arp’s ‘Spiral Galaxies – Companions on Arms – Small High Surface Brightness Companions class’, these are located approximately 335 million light-years away in Eridanus.

UGC 3105 (PGC 15655 and others) is the largest galaxy in this field. It is located approximately 317 million light-years away.

* 51 Eri (HIP 21547, TYC 4739-1551-1 and many others) is the bright, magnitude 5.21 star at the bottom left. This star has a confirmed exoplanet - * 51 Eri b. More information on this larger than Jupiter planet can be found here -

Luminance – 27x600s – 270 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2

390 minutes total exposure – 6 hours 30 minutes

Imaged December 16th, 17th and 18th, 2020 from Dark Sky New Mexico at Rancho Hidalgo (Animas, New Mexico) with a SBIG STF-8300M on an Astro-Tech AT12RCT at f/8 2432mm.
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