Its story

HIP 21135 has a visual magnitude of about 6.66: it usually needs binoculars or a small telescope, especially from light-polluted sites.

Equatorial coordinates for HIP 21135: right ascension 4h 31m 50s, declination +5° 45′ 52″ (J2000), in the region of the Taurus constellation (IAU figure Tau).

HIP 21135. It appears in classical and modern catalogs as HIP 21135, HD 28715, Gaia DR3 3285542336676520448. In the SkyKeepsake Taurus (Tau) browse hub it sits with other stars of the same IAU figure.