5 Ursae Minoris

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]
Distance359 ± 5 ly
(110 ± 2 pc)
Absolute magnitude (MV)−0.96[4]
Details
Mass1.86[2] M☉
Radius16[5] R☉
Luminosity447[2] L☉
Surface gravity (log g)1.91[6] cgs
Temperature4,095±39[2] K
Metallicity [Fe/H]−0.16[6] dex
Rotational velocity (v sin i)1.9[7] km/s
Age2.00[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
SIMBADdata

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]

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]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i j k l Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference cadars2001 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Soubiran2010 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference DeMedeiros2000 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference McClure1983 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Brown1989 was invoked but never defined (see the help page).