HD 91312

HD 91312

Observation data Epoch {{{epoch}}}      Equinox
Constellation	Ursa Major
Right ascension	10h 33m 13.88880s
Declination	40° 25′ 32.0172″
Characteristics
Spectral type	A7IV
Other designations
BD+41 2101, HD 91312, HIP 51658, HR 4132, SAO 43379, ADS 7826 A, WDS J10332+4026A, PLX 2466, TYC 3005-1206-1, IRAS 10303+4040, 2MASS J10331388+4025316
Database references
SIMBAD	data

HD 91312 (HR 4132, HIP 51658) is a star in the constellation Ursa Major. Its apparent magnitude is 4.73. It is the brightest star of Ursa Major without Flamsteed designation.

History of observations

This star is relatively bright, but it was rarely included in old catalogues. Catalogues and atlases it was not included in are for example those by Ptolemy and all its derivatives and translations (by as-Sufi, al-Biruni, Ulugh Beg, Copernicus, Clavius etc.), Tycho Brahe, de Houtman, Bayer, Kepler, Schiller, Halley, Flamsteed (as well as published by Carolina Herschel in 1798 catalogue of stars, observed by Flamsteed, but not inserted in his British Catalogue), Bradley. Catalogues and atlases it was included in are those by Hevelius (1690) (65th in Ursa Major, designated In Ungula sinistri Pedis poster. trium sequens) and Bode (1801) (number 157 of Ursa Major). Bode used extended Bayer designations for some stars, and HD 91312 also was assigned designation "w", whereas original Bayer designations for Ursa Major stars are all Greek letters and Latin letters from "A" to "h".