Arcus

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Arcus, also known as CelWP G17, is a binary star system containing Arcus or Arcus-Emyn, an Red giant star and a Mira variable, as well as Cathica, a small red dwarf with an planetary system. Located in Triangulum's spiral arms, its notable as being the origin and source of the extremely well-known Arcus Nebula, from which the system was named.

Physical characteristics
Over a pulsation period of 113.6 days, its radius varies between 869.4 RSun and 1062.6 RSun. Its initial mass was recently determinated to be 18.486 MSun. In real life, its named M33SSS J013300.38+303416.8.

Notoriety
Arcus has been heavily studied due to its relatively recent confirmation of its nature as a Thorne-Żytkow object, having a neutron star in its core, which was named Emyn. This inspired scientists all over the galaxy to observe it, and several missions were designed for Arcusan exploration. Today, Arcus is an popular tourist destination for the galactic population of Triangulum.

Prehistoric
The Arcus system formed as a pair of B-type stars, being orbited by Cathica.