2 Ursae Majoris

2 Ursae Majoris
Location of 2 Ursae Majoris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 08h 34m 36.17989s[1]
Declination +65° 08′ 42.4071″[1]
Apparent magnitude (V) 5.47[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type kA3hA5mA7s[4]
B−V color index +0.207[2]
Astrometry
Radial velocity (Rv)−16.87±0.13[1] km/s
Proper motion (μ) RA: −79.362[1] mas/yr
Dec.: −65.977[1] mas/yr
Parallax (π)21.7823 ± 0.1487 mas[1]
Distance150 ± 1 ly
(45.9 ± 0.3 pc)
Absolute magnitude (MV)2.12[2]
Details
Mass1.9[5] M☉
Radius1.8[5] R☉
Luminosity11.0[5] L☉
Surface gravity (log g)4.22[5] cgs
Temperature7,912[5] K
Metallicity [Fe/H]+0.19[6] dex
Rotational velocity (v sin i)11.9[6] km/s
Age560[7] Myr
Other designations
A UMa, 2 UMa, BD+65°638, HD 72037, HIP 42080, HR 3354[8]
Database references
SIMBADdata

2 Ursae Majoris (2 UMa) is an Am star in the northern circumpolar constellation of Ursa Major, located 150 light-years from the Sun. It has the Bayer designation A Ursae Majoris; 2 Ursae Majoris is the Flamsteed designation. It is visible to the naked eye as a faint white star with an apparent visual magnitude of 5.5. Currently 150 light years away, it is moving closer to the Earth with a heliocentric radial velocity of −17 km/s.[2]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference burkhart1979 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference abt1995 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference ticv8 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference takeda2019 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference derosa2014 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).