6 Serpentis

6 Serpentis
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension 15h 21m 01.99609s[1]
Declination +00° 42′ 55.2213″[1]
Apparent magnitude (V) 5.382[2] (5.54 + 9.42)[3]
Characteristics
Spectral type K3 III[2]
B−V color index 1.224[2]
Astrometry
Radial velocity (Rv)+9.7±0.3[4] km/s
Proper motion (μ) RA: −42.36[1] mas/yr
Dec.: −103.14[1] mas/yr
Parallax (π)13.63 ± 0.73 mas[1]
Distance240 ± 10 ly
(73 ± 4 pc)
Absolute magnitude (MV)1.03[5]
Details[2]
6 Ser A
Mass1.27 M☉
Radius12[6] R☉
Luminosity55 L☉
Surface gravity (log g)2.4[6] cgs
Temperature4,417±17 K
Metallicity [Fe/H]−0.02[7] dex
Rotational velocity (v sin i)2.4[6] km/s
Age6.03 Gyr
Other designations
6 Ser, BD+01° 3067, HD 136514, HIP 75119, HR 5710, SAO 120955, ADS 9596, WDS J15210+0043[8]
Database references
SIMBADdata

6 Serpentis is a binary star[3] system in the constellation Serpens. It has a combined apparent visual magnitude of 5.382,[2] which is bright enough to be faintly visible to the naked eye. The distance to this system, based upon an annual parallax shift of 13.63±0.73 mas,[1] is about 240 light years. It is moving further from the Sun with a heliocentric radial velocity of +10 km/s.[4]

The primary, component A, is an evolved red giant of spectral type K3III,[2] a star that has used up its core hydrogen and has expanded. At the age of around six billion years it is a red clump star,[7][9] indicating it is on the horizontal branch and is generating energy through helium fusion at its core. The star has 1.27[2] times the mass of the Sun and has expanded to 12[6] times the Sun's radius. It is radiating 55[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,417 K.[2]

As of 2005, the magnitude 9.42[3] secondary, component B, was at an angular separation of 3.329″±0.017″ along a position angle of 21.8°±0.3°.[10]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Eggleton2008 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. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference laney2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Alves2000 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Scardia2007 was invoked but never defined (see the help page).