HD 91312

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.

HD 91312
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension  10h 33m 13.88880s[1]
Declination 40° 25′ 32.0172″[1]
Characteristics
Spectral type A7 IV[2]
Astrometry
Proper motion (μ) RA: −138.103±0.350[1] mas/yr
Dec.: 3.172±0.328[1] mas/yr
Parallax (π)29.8168 ± 0.2283[1] mas
Distance109.4 ± 0.8 ly
(33.5 ± 0.3 pc)
Other designations
BD+41°2101, HIP 51658, HR 4132, SAO 43379, ADS 7826 A, WDS J10332+4026A, TYC 3005-1206-1, 2MASS J10331388+4025316[2]
Database references
SIMBADdata

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".

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. "HD 91312". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-14.


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