NGC 3955 is a peculiar lenticular galaxy in the constellation of Crater. Its velocity with respect to the cosmic microwave background is , which corresponds to a Hubble distance of . Additionally, one non-redshift measurement gives a closer distance of . It was discovered by German-British astronomer William Herschel on 21 December 1786.
NGC 3955 has a possible active galactic nucleus, i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.
NGC 4038 group NGC 3955 is a member of the NGC 4038 group (also known as LGG 263). This group contains 27 galaxies, including , , NGC 3981, , NGC 4027, NGC 4033, , the Antennae Galaxies, and , among others.
Supernova One supernova has been observed in NGC 3955: SN 2026gzx (TypeIc, mag. 16.797) was discovered by ATLAS on 23 March 2026. It was initially classified as TypeIa, but later analysis concluded it was Type Ic.
See also List of NGC objects (3001–4000)
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