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31 Persei

31 Persei
Location of 31 Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 03h 19m 07.63796s[1]
Declination 50° 05′ 41.8724″[1]
Apparent magnitude (V) 5.05[2]
Characteristics
Spectral type B5V[3]
U−B color index −0.53[4]
B−V color index −0.06[4]
Astrometry
Radial velocity (Rv)−1.60[5] km/s
Proper motion (μ) RA: +23.580[1] mas/yr
Dec.: −23.322[1] mas/yr
Parallax (π)5.8399 ± 0.1792 mas[1]
Distance560 ± 20 ly
(171 ± 5 pc)
Absolute magnitude (MV)−1.44[6]
Details
Mass4.647[7] M☉
Radius3.4[8] R☉
Luminosity950[6] L☉
Temperature15,301[6] K
Metallicity [Fe/H]0.00[9] dex
Rotational velocity (v sin i)260[10] km/s
Age234[11] Myr
Other designations
31 Per, BD+49°902, GC 3945, HD 20418, HIP 15444, HR 989, SAO 38714[12]
Database references
SIMBADdata

31 Persei is a single[13] star in the northern constellation of Perseus. It is visible to the naked eye as a dim, blue-white hued point of light with an apparent visual magnitude of 5.05.[2] This star is located around 172 parsecs (560 ly) away from the Sun,[14] and it is drifting closer with a radial velocity of −1.6 km/s.[5] It is likely a member of the Alpha Persei Cluster.[15]

This object is a massive B-type main-sequence star with a stellar classification of B5V[3] and it is currently generating energy through hydrogen fusion at its core. It is around 234[9] million years old and is spinning rapidly with a projected rotational velocity of 260 km/s.[10] The star has 4.6[7] times the mass of the Sun and about 3.4[8] times the radius of the Sun. It is radiating 950[6] times the luminosity of the Sun from its photosphere at an effective temperature of 15,301 K.[6]

  1. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference XHIP 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 Mallama2014 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 Cite error: The named reference Silaj2014 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Sheikhi2016 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference cadars was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Abt2002 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Gontcharov2012b was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Zuckerman2012 was invoked but never defined (see the help page).
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