HD 111456

HD 111456
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 12h 48m 39.44700s[1]
Declination 60° 19′ 11.0379″[1]
Apparent magnitude (V) 5.85[2]
Characteristics
Spectral type F7 V[3]
U−B color index −0.04[2]
B−V color index +0.46[2]
Astrometry
Radial velocity (Rv)−18.0±0.9[4] km/s
Proper motion (μ) RA: +120.949[1] mas/yr
Dec.: +35.712[1] mas/yr
Parallax (π)38.1905 ± 0.2904 mas[1]
Distance85.4 ± 0.6 ly
(26.2 ± 0.2 pc)
Absolute magnitude (MV)+4.2±0.2[5]
Details
Radius1.22[5] R
Luminosity6.45[6] L
Surface gravity (log g)4.5[5] cgs
Temperature6,400[5] K
Rotational velocity (v sin i)41.5±1.1[5] km/s
Age300−400[5] Myr
Other designations
BD+61°1320, GJ 9417, HD 111456, HIP 62512, HR 4867, SAO 236405, WDS J12487+6019AB[7]
Database references
SIMBADdata

HD 111456 is a yellow-white hued star in the northern circumpolar constellation of Ursa Major. It is dimly visible to the naked eye, having an apparent visual magnitude of 5.85.[2] Based upon an annual parallax shift of 38.2 mas as seen from Earth, it is located about 85 light years from the Sun. The star is moving closer to the Sun with a radial velocity of −18 km/s.[4] HD 111456 is a nucleus cluster member of the Ursa Major Moving Group, a set of stars that are moving through space with a similar heading and velocity. Six other stars in the nucleus of the group are prominent members of the Big Dipper asterism.[3]

The stellar classification for this star is F7 V,[3] indicating that it is an ordinary F-type main-sequence star. It is young, around 300−400 million years of age, and is spinning with a relatively high projected rotational velocity of 41.5 km/s.[5] This is one of the most active F-type stars known, and it is a strong emitter of X-rays[5] and an extreme UV source. It is an astrometric binary with a period of four years and a mass ratio of 0.5. Hence, the companion may be a young white dwarf star.[8]

  1. ^ a b c d e Cite error: The named reference dr2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Levato1978 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ a b c d e f g h Cite error: The named reference Ferrero2004 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Goldin2006 was invoked but never defined (see the help page).