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51 Orionis

This article is about b Orionis. Not to be confused with β (beta) Orionis.
51 Orionis
Location of 51 Orionis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 42m 28.63240s[1]
Declination +01° 28′ 28.6714″[1]
Apparent magnitude (V) 4.90[2]
Characteristics
Spectral type K1III[3]
U−B color index +1.06[2]
B−V color index +1.17[2]
Astrometry
Radial velocity (Rv)+87.55[4] km/s
Proper motion (μ) RA: −54.741[1] mas/yr
Dec.: −14.732[1] mas/yr
Parallax (π)10.9178 ± 0.2225 mas[1]
Distance299 ± 6 ly
(92 ± 2 pc)
Absolute magnitude (MV)0.13[5]
Details
Mass1.11[5] M☉
Radius19.3+0.4
−1.0[1] R☉
Luminosity132±3[1] L☉
Surface gravity (log g)2.24[6] cgs
Temperature4,458+92
−51[1] K
Metallicity [Fe/H]−0.45[6] dex
Rotational velocity (v sin i)1.1[7] km/s
Age4.06[8] Gyr
Other designations
b Ori, 51 Ori, BD+01°1105, FK5 2427, GC 7136, HD 37984, HIP 26885, HR 1963, SAO 113056[9]
Database references
SIMBADdata

51 Orionis is a single[10] star in the equatorial constellation of Orion.[9] It has the Bayer designation b Orionis, while 51 Orionis is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.90.[2] It is located approximately 299 light-years away from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +88 km/s.[4]

This is an aging giant star with a stellar classification of K1III,[3] having exhausted the supply of hydrogen at its core and expanded to 19 times the Sun's radius.[1] It is four[8] billion years old with 1.11[5] times the mass of the Sun. The star is radiating 132[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,458 K.[1]

  1. ^ a b c d e f g h i j k l Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Ducati2002 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Hoffleit1991 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference DaSilva2015 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Wu2011 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference deMedeiros1999 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
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