Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation
Ursa Major
Right ascension
09h 50m 59.35700s[1]
Declination
+59° 02′ 19.4486″[1]
Apparent magnitude (V)
3.68 – 3.86[2]
Characteristics
Spectral type
F2 IV[3]
U−B color index
+0.09[4]
B−V color index
+0.29[4]
Variable type
δ Sct[2]
Astrometry
Radial velocity (Rv)
27.3±4.1[5] km/s
Proper motion (μ)
RA: +42.97[1] mas/yr Dec.: −23.62[1] mas/yr
Parallax (π)
28.06 ± 0.20 mas[1]
Distance
116.2 ± 0.8 ly (35.6 ± 0.3 pc)
Absolute magnitude (MV)
+1.11[6]
Details
υ UMa A
Mass
1.57[7] or 2.20[3]M☉
Radius
2.79±0.40[8]R☉
Luminosity
29.5[9]L☉
Surface gravity (log g)
3.79±0.14[7] cgs
Temperature
7,211±245[7] K
Rotation
1.2±0.30 d[8]
Rotational velocity (v sin i)
124.2[10] km/s
Age
1.168[7] Gyr
υ UMa B
Mass
0.44[3]M☉
Other designations
υ UMa, WDS J09510+5902[11]
A: 29 Ursae Majoris, BD+59°1268, FK5 368, HD 84999, HIP 48319, HR 3888, SAO 27401[11]
Database references
SIMBAD
data
Upsilon Ursae Majoris, Latinized from υ Ursae Majoris, is a binary star[12] in the northern circumpolar constellation of Ursa Major. It is visible to the naked eye with an apparent visual magnitude of +3.79.[4] Based upon an annual parallax shift of 13.24 mas,[1] it is located roughly 246 light-years from the Sun.
A light curve for Upsilon Ursae Majoris, plotted from TESS data[13]
The primary member of the system, component A, is an F-type subgiant star. It is a Delta Scuti variable[8] with a period of 0.1327 day and an amplitude of 0.050 magnitude.[14] With an estimated age of 1.168[7] billion years, it is spinning rapidly with a projected rotational velocity of 124.2 km/s[10] and a rotation period of 1.2 days.[8] The star has about 1.57[7] times the mass of the Sun and 2.79[8] times the Sun's radius. (De Rosa and colleagues give a mass estimate of 2.2[3] times the Sun's mass.) It is radiating around 29.5[9] times the solar luminosity from its outer atmosphere at an effective temperature of 7,211 K.[7]
The companion, component B, is a magnitude +11.0 star.[12] As of 2008, it has an angular separation of 11.78 arcseconds along a position angle of 295.4°. This corresponds to a projected separation of 419.8 AU.[3] It has a mass around 40% that of the Sun.[3]
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and 18 Related for: Upsilon Ursae Majoris information
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