Its story

HIP 81991 has a visual magnitude of about 6.32: it usually needs binoculars or a small telescope, especially from light-polluted sites.

Equatorial coordinates for HIP 81991: right ascension 16h 44m 60s, declination +6° 5′ 13″ (J2000), in the region of the Ophiuchus constellation (IAU figure Oph).

HIP 81991. It appears in classical and modern catalogs as HIP 81991, HD 151090, Gaia DR3 4435689739087756800. In the SkyKeepsake Ophiuchus (Oph) browse hub it sits with other stars of the same IAU figure.