26 Ursae Majoris

26 Ursae Majoris
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 09h 34m 49.43259s[1]
Declination +52° 03′ 05.3165″[1]
Apparent magnitude (V) 4.47[2]
Characteristics
Evolutionary stage main sequence
Spectral type A0 Vn[3]
U−B color index +0.00[4]
B−V color index +0.027±0.013[2]
Astrometry
Radial velocity (Rv)+22.2±1.1[5] km/s
Proper motion (μ) RA: −65.74[1] mas/yr
Dec.: −37.32[1] mas/yr
Parallax (π)12.44 ± 0.19 mas[1]
Distance262 ± 4 ly
(80 ± 1 pc)
Absolute magnitude (MV)−0.06[2]
Details
Mass2.16[6] M☉
Radius2.2[7] R☉
Luminosity99.2[2] L☉
Surface gravity (log g)3.94[6] cgs
Temperature9,757±332[6] K
Rotational velocity (v sin i)165[3] km/s
Age147[6] Myr
Other designations
26 UMa, BD+52°1402, HD 82621, HIP 47006, HR 3799, SAO 27298[8]
Database references
SIMBADdata

26 Ursae Majoris is a single[9] star in the northern circumpolar constellation of Ursa Major, located 262 light years away from the Sun.[1] It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.47.[2] The object is moving further from the Earth with a heliocentric radial velocity of +22 km/s.[5]

This is an A-type main-sequence star with a stellar classification of A0 Vn,[3] where the 'n' indicates "nebulous" lines in the spectrum due to rapid rotation. It has a high rate of spin with a projected rotational velocity of 165 km/s,[3] which is giving it an oblate shape with an equatorial bulge that is 8% larger than the polar radius.[10] The star is 147[6] million years old with just over double[6] the mass of the Sun and twice[7] the Sun's radius. It is radiating 99[2] times the Sun's luminosity from its photosphere at an effective temperature of 9,757 K.[6]

  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 Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference abt1995 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference EgUBV was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b c d e f g Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference CADARS 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 Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference vanBelle2012 was invoked but never defined (see the help page).