Sextans B (also known as UGC 5373 and DDO 70) is an irregular galaxy that may be part of the Local Group, or lie just beyond it.

The earliest known reference to this galaxy is from a 1954 paper by Edison Pettit in The Astrophysical Journal, where it was listed as "Wilson Dwarf".

[8] The existence of Cepheid variables in the galaxy implies that Sextans B contains at least some young stars.

[12] Although no supernovae have been observed in Sextans B, the galaxy is close enough for classical novae to be detected.

The first confirmed nova in this galaxy was discovered by ATLAS at magnitude 18.553 on 10 November 2024, and designated AT 2024aawe.