Its story

21 Mon has a visual magnitude of about 5.36: under a reasonably dark sky it is typically reachable with the unaided eye.

Equatorial coordinates for 21 Mon: right ascension 7h 11m 24s, declination −0° 18′ 7″ (J2000), in the region of the Monoceros constellation (IAU figure Mon).

21 Mon. It appears in classical and modern catalogs as HIP 34724, HD 55057, Gaia DR3 3111154810353133184. In the SkyKeepsake Monoceros (Mon) browse hub it sits with other stars of the same IAU figure.