Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation
Ursa Major
Right ascension
11h 18m 28.73720s[1]
Declination
+33° 05′ 39.5109″[1]
Apparent magnitude (V)
+3.490[2]
Characteristics
Spectral type
K3 III[3]
U−B color index
+1.550[2]
B−V color index
+1.400[2]
Astrometry
Radial velocity (Rv)
-9.63 ± 0.38[4] km/s
Proper motion (μ)
RA: −26.139 mas/yr[1] Dec.: 27.892 mas/yr[1]
Parallax (π)
8.17 ± 0.17 mas[5]
Distance
399 ± 8 ly (122 ± 3 pc)
Absolute magnitude (MV)
−2.47 ± 0.16[6]
Details
Mass
3.82±0.23[7]M☉
Radius
60+1.24 −1.29[7]R☉
Luminosity
1242±81[7]L☉
Surface gravity (log g)
1.89[6] cgs
Temperature
4,422±26[7] K
Metallicity [Fe/H]
–0.04[6] dex
Rotational velocity (v sin i)
10[8] km/s
Age
200±30[7] Myr
Other designations
Alula Borealis, ν Ursae Majoris, ν UMa, Nu UMa, 54 Ursae Majoris, BD+33 2098, CCDM J11185+3306A, FK5 425, GC 15547, HD 98262, HIP 55219, HR 4377, IDS 11131+3338 A, PPM 75790, SAO 62486, WDS J11185+3306A [9]
Database references
SIMBAD
data
Nu Ursae Majoris (ν Ursae Majoris, abbreviated Nu UMa, ν UMa), formally named Alula Borealis/əˈluːləbɒriˈælɪs/,[10][11] is a double star in the northern circumpolar constellation of Ursa Major. At an apparent visual magnitude of +3.490,[2] it is bright enough to be seen with the naked eye. Based upon parallax measurements, the distance to ν Ursae Majoris is about 399 light-years (122 parsecs).[5] At such distance, its apparent brightness is diminished by 0.48 magnitudes due to interveining gas and dust.[7]
This is a giant star with a stellar classification of K3 III.[3] Being 200 million years old, it has expanded to about 60 times the radius of the Sun and is radiating 1240 times the Sun's luminosity. The effective temperature of the outer envelope is 4,422 K;[7] cool enough to give it an orange hue typical of a K-type star.[12] It has a 10th-magnitude optical companion at an angular separation of 7.1 arcseconds.
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^Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
^"IAU Catalog of Star Names". Retrieved 28 July 2016.
^Cite error: The named reference csiro was invoked but never defined (see the help page).
NuUrsaeMajoris (ν UrsaeMajoris, abbreviated Nu UMa, ν UMa), formally named Alula Borealis /əˈluːlə bɒriˈælɪs/, is a double star in the northern circumpolar...
asterism consisting of ι UrsaeMajoris, Kappa UrsaeMajoris, Lambda UrsaeMajoris, Mu UrsaeMajoris, NuUrsaeMajoris and Xi UrsaeMajoris. Consequently, the...
Detail for NSV 4456". www.aavso.org. Retrieved 2022-09-01. "VSX : Detail for nu. Pup". www.aavso.org. Retrieved 2022-09-03. "VSX : Detail for NSV 14656"....
Eta Canis Majoris Alula Australis, Alula Borealis (al-Qafzat) ul-Ūla' the First (Leap) القفزة الأولى Xi UrsaeMajoris and NuUrsaeMajoris Alya al-Alyah...
Majoris Tania Australis 中台一 Zhōng Tái èr The Second Middle Step NuUrsaeMajoris Alula Borealis 下台一 Xià Tái yī The First Lower Step Xi UrsaeMajoris Alula...
around 4.1. Epsilon Coronae Australis is the brightest example of a W UrsaeMajoris variable in the southern sky. Lying alongside the Milky Way, Corona...
into one of the traditional classes, with features of Beta Lyrae, W UrsaeMajoris, and cataclysmic variables. It may be a representative of a very brief...
(1997). "Multichannel optical aperture synthesis imaging of zeta1 URSAEmajoris with the Navy prototype optical interferometer". The Astronomical Journal...
Mskegwǒm, the den of the celestial bear (Alpha, Beta, Gamma and Delta UrsaeMajoris). Polynesian peoples often recognized Corona Borealis; the people of...
subclass UGSU – (celestial object) UG SU UrsaeMajoris, a subclass of UG-type stars named after SU UrsaeMajoris, the archetype for the subclass UGWZ –...