Theta Ursae Majoris

Database links to θ Ursae Majoris

Star θ Ursae Majoris
AladinLite
Observation dates equinox :  J2000.0 , epoch : J2000.0
Constellation	Big Bear
Right ascension	09 h 32 m 51.4 s
declination	+ 51 ° 40 ′ 38 ″
Apparent brightness	3.2 mag
Typing
Astrometry
parallax	74.19 ± 0.14  mas
distance	44.0  ly 13.5  pc
Physical Properties
Other names and catalog entries
Bayer name θ Ursae Majoris Flamsteed name 25 Ursae Majoris Bonn survey BD + 52 ° 1401 Bright Star Catalog HR 3775 [1] Henry Draper Catalog HD 82328 [2] Hipparcos catalog HIP 46853 [3] SAO catalog SAO 27289 [4] Tycho catalog TYC 3432-1451-1 [5] 2MASS catalog 2MASS J09325151 + 5140384 [6] Other names LHS 270, FK5  358

Theta Ursae Majoris , θ Ursae Majoris or θ UMa (also 25 UMa ) is a star in the constellation Great Bear with an apparent magnitude of about 3.2 mag and barely 44 light years away. It belongs to the spectral class F, presumably represents a spectroscopic binary star , and has a companion of the spectral class M only 13.8 mag bright at a distance of 4.1 arc seconds .

Together with other stars of the constellation Ursa Major - τ , h , υ , φ , e and f Ursae Maioris - θ UMa forms an asterism known in Arabic as sarīr banāt al-na'sh and al-haud and is therefore occasionally also Alhaud V or called Sarir .

Individual evidence

1. ^ Helmut Abt: "MK Classifications of Spectroscopic Binaries." In: The Astrophysical Journal Supplement. Volume 180, January 2009, doi: 10.1088 / 0067-0049 / 180/1/117 , pp. 117-118.
2. ^ P. Eggleton, A. Tokovinin: A catalog of multiplicity among bright stellar systems. In: Monthly Notices of the Royal Astronomical Society. Volume 389, No. 2, September 2008, doi: 10.1111 / j.1365-2966.2008.13596.x , pp. 869-879.
3. ↑ Jack Rhoads: Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars. Jet Propulsion Laboratory, California Institute of Technology, November 15, 1971, pp. 22 and 46, respectively. PDF
4. ↑ Sarir on universeguide.com