57 Persei

57 Persei
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 04h 33m 24.90304s[1]
Declination +43° 03′ 50.0154″[1]
Apparent magnitude (V) 6.078[2]
Characteristics
Spectral type F0 V[3]
U−B color index +0.01[4]
B−V color index +0.38[4]
Astrometry
Radial velocity (Rv)−23.0±4.3[5] km/s
Proper motion (μ) RA: +5.370[1] mas/yr
Dec.: +5.531[1] mas/yr
Parallax (π)16.3759 ± 0.0181 mas[1]
Distance199.2 ± 0.2 ly
(61.07 ± 0.07 pc)
Absolute magnitude (MV)+2.23[6]
Details
Mass1.28[7] M☉
Radius2.6[1] R☉
Luminosity11.0[1] L☉
Surface gravity (log g)3.87[7] cgs
Temperature6,615±225[7] K
Metallicity [Fe/H]−0.19[8] dex
Rotational velocity (v sin i)90[3] km/s
Age1.614[7] Gyr
Other designations
m Per, 57 Per, BD+42°990, FK5 1124, HD 28704, HIP 21242, HR 1434, SAO 39604, WDS J04334+4304A[9]
Database references
SIMBADdata

57 Persei, or m Persei, is a suspected triple star[10] system in the northern constellation of Perseus. It is at the lower limit of visibility to the naked eye, having a combined apparent visual magnitude of 6.08.[2] The annual parallax shift of 16.4 mas provides a distance measure of 199 light years. 57 Persei is moving closer to the Sun with a radial velocity of about −23[5] km/s and will make perihelion in around 2.6 million years at a distance of roughly 22 ly (6.6 pc).[11]

The primary member, 57 Persei, is a magnitude 6.18,[10] yellow-white hued F-type main-sequence star with a stellar classification of F0 V,[3] indicating it is generating energy by fusing its core hydrogen. It is an estimated 1.6[7] billion years old and is spinning with a projected rotational velocity of 90 km/s.[3] The star has 1.3[7] times the mass of the Sun and is radiating 11 times the Sun's luminosity from its photosphere at an effective temperature of around 6,615 K.[7]

An unseen companion has been identified via slight changes to the proper motion of the primary.[10] The third possible member of the system, designated component B,[12] is a magnitude 6.87 F-type star at an angular separation of 120.13 arc seconds.[10] This star has a different parallax and space velocity than the primary,[13] so it may just be a wide visual companion.[12] There are three other nearby visual companions that are not physically associated with the 57 Persei system.[12]

  1. ^ a b c d e f g Cite error: The named reference dr3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference tycho2 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Royer2007 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference hr was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference deBruijne2012 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. ^ a b c d e f g Cite error: The named reference David2015 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Casagrande2011 was invoked but never defined (see the help page).
  9. ^ "57 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-30.
  10. ^ a b c d Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference BailerJones2015 was invoked but never defined (see the help page).
  12. ^ a b c Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference dr3b was invoked but never defined (see the help page).