56 Orionis

56 Orionis
Location of 56 Orionis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 52m 26.43865s[1]
Declination +01° 51′ 18.5021″[1]
Apparent magnitude (V) 4.76[2] (4.73 to 4.78)[3]
Characteristics
Spectral type K2-IIb[4]
U−B color index +1.46[5]
B−V color index +1.382±0.005[2]
Astrometry
Radial velocity (Rv)+11.27±0.14[1] km/s
Proper motion (μ) RA: –6.942[1] mas/yr
Dec.: –8.355[1] mas/yr
Parallax (π)2.8794 ± 0.1854 mas[1]
Distance1,130 ± 70 ly
(350 ± 20 pc)
Absolute magnitude (MV)−3.14[2]
Details
Mass6.4±0.7[6] M☉
Radius92.21+4.27
−6.72[1] R☉
Luminosity2,547±187[1] L☉
Surface gravity (log g)0.91[7] cgs
Temperature4,270+165
−96[1] K
Metallicity [Fe/H]−0.07[7] dex
Rotational velocity (v sin i)3.5[8] km/s
Age60.7±18.4[6] Myr
Other designations
56 Ori, NSV 2690, BD+01°1151, FK5 2444, GC 7380, HD 39400, HIP 27750, HR 2037, SAO 113220, CCDM J05524+0151, WDS 05524+0151[9]
Database references
SIMBADdata

56 Orionis is a single,[10] variable star in the equatorial constellation of Orion. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around 4.76.[2] The star is located at a distance of approximately 1,130[1] light years from the Sun based on parallax.[1] It is drifting further away with a radial velocity of +11 km/s.[1] The star has a peculiar velocity of 19.0+2.9
−3.1 km/s relative to its neighbors, and may be a runaway star.[6]

This object is a bright giant star with a stellar classification of K2-IIb.[4] It is a suspected variable star of unknown type with a brightness that has been measured varying from 4.73 down to 4.78.[3] The star is about 61[6] million years old with 6.4[6] times the mass of the Sun and is spinning with a projected rotational velocity of 3.5.[8] Having exhausted the supply of hydrogen at its core, the star has expanded to 92[1] times the radius of the Sun. It is radiating 2,547 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,270 K.[1]

It has one reported visual companion, designated component B, with magnitude 13.5 and angular separation 42.9″.[11]

  1. ^ a b c d e f g h i j k l m n 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 XHIP was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Mallama2014 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Luck2014 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference deMedeiros1999 was invoked but never defined (see the help page).
  9. ^ 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).
  11. ^ Cite error: The named reference WDS was invoked but never defined (see the help page).