Kappa Ursae Majoris

Kappa Ursae Majoris
Kappa Ursae Majoris is located in 100x100
Kappa Ursae Majoris

Location of κ Ursae Majoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 09h 03m 37.52762s[1]
Declination +47° 09′ 23.4890″[1]
Apparent magnitude (V) 3.56 (4.16 + 4.54)[2]
Characteristics
Spectral type A0 IV-V + A0 V[3]
Astrometry
Proper motion (μ) RA: −36.19[1] mas/yr
Dec.: −55.40[1] mas/yr
Parallax (π)9.10 ± 0.50 mas[1]
Distance360 ± 20 ly
(110 ± 6 pc)
Absolute magnitude (MV)−1.63[4]
Orbit[5]
Period (P)13,007.2±9.7 d
Semi-major axis (a)0.18194 ± 0.00025″
Eccentricity (e)0.5584±0.0015
Inclination (i)109.410±0.066°
Longitude of the node (Ω)105.641±0.080°
Periastron epoch (T)50404 ± 12
Argument of periastron (ω)
(secondary)		355.63±0.36°
Details
κ UMa A
Mass3.79±0.12[6] M☉
Radius7.87[7] R☉
Temperature9,060[7] K
Rotational velocity (v sin i)201[6] km/s
Other designations
Alkaphrah, κ UMa, 12 Ursae Majoris, BD+47°1633, FK5 341, GC 12503, HD 77327, HIP 44471, HR 3594, SAO 42661, PPM 50987, CCDM J09036+4709AB, WDS J09036+4709AB[8]
Database references
SIMBADdata

Kappa Ursae Majoris (κ Ursae Majoris, abbreviated Kappa UMa, κ UMa) is a binary star in the constellation of Ursa Major. With a combined apparent magnitude of +3.60,[9] the system is approximately 358 light-years from Earth.

The two components are designated Kappa Ursae Majoris A (officially named Alkaphrah /ælˈkæfrə/, a traditional name of the system)[10] and B.

  1. ^ a b c d e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference mnras389_2_869 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference aj81_245 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. ^ Cite error: The named reference Hartkopf2006 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Cotten2016 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 clpl4 was invoked but never defined (see the help page).
  10. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.