5 Ursae Minoris

5 Ursae Minoris is a star in the circumpolar constellation of Ursa Minor. It is a faint star but visible to the naked eye with an apparent visual magnitude of 4.253.^[2] The distance to this star, as determined from an annual parallax shift of 9.09±0.13 mas,^[1] is about 110 pc. It is moving further away with a heliocentric radial velocity of +9 km/s.^[2]

5 Ursae Minoris

Observation data Epoch J2000      Equinox J2000
Constellation	Ursa Minor
Right ascension	14h 27m 31.54335s[1]
Declination	+75° 41′ 45.5717″[1]
Apparent magnitude (V)	4.253[2]
Characteristics
Spectral type	K4-III[3]
B−V color index	1.457[2]
Astrometry
Radial velocity (Rv)	+9.34[2] km/s
Proper motion (μ)	RA: +8.79[1] mas/yr Dec.: +21.76[1] mas/yr
Parallax (π)	9.09±0.13 mas[1]
Distance	359 ± 5 ly (110 ± 2 pc)
Absolute magnitude (MV)	−0.96[4]
Details
Mass	1.86[2] M☉
Radius	16[5] R☉
Luminosity	447[2] L☉
Surface gravity (log g)	1.91[6] cgs
Temperature	4,095±39[2] K
Metallicity [Fe/H]	−0.16[6] dex
Rotational velocity (v sin i)	1.9[7] km/s
Age	2.00[2] Gyr
Other designations
5 UMi, NSV 6687, BD+76° 527, FK5 1379, HD 127700, HIP 70692, HR 5430, SAO 8024, WDS J14275+7542A[8]
Database references
SIMBAD	data

With an age of around two billion years, this is an evolved red giant with a stellar classification of K4-III;^[3] a star that has used up its core hydrogen and has expanded. It is a mild barium star, which may indicate it is a binary with a white dwarf companion,^[9] and is very lithium-weak.^[10] The star has an estimated 1.86^[2] times the mass of the Sun and has expanded to about 16^[5] times the Sun's radius. It is radiating 447^[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,095 K.^[2]