UGC 3855, also known as PGC 21067 or sometimes as the Modest galaxy, is a spiral galaxy in the constellation of Lynx. Its velocity with respect to the cosmic microwave background is , which corresponds to a Hubble distance of . However, 4 non-redshift measurements give a closer mean distance of . The first known reference to this galaxy comes from Part 1 of the Morphological Catalogue of Galaxies, published in 1962, where it is listed as MCG +10-11-052.
It is a relatively old galaxy with a stellar population around 10.6 billion years old. It also has a low rate of star formation of about 0.2 solar masses per year.
Supernova One supernova has been observed in UGC 3855: SN 2021agco (TypeIb, mag. 17.6) was discovered by the Xingming Observatory Sky Survey (XOSS) on 5 December 2021. It is the closest ultra-stripped supernova yet discovered.
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