Sigma Serpentis

σ Serpentis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Serpens
Right ascension 16h 22m 04.34753s[1]
Declination +01° 01′ 44.5534″[1]
Apparent magnitude (V) +4.82[2]
Characteristics
Spectral type F3 V[3]
U−B color index +0.025[2]
B−V color index +0.338[2]
Astrometry
Radial velocity (Rv)−49.3±0.9[4] km/s
Proper motion (μ) RA: −158.40[1] mas/yr
Dec.: +49.56[1] mas/yr
Parallax (π)36.67 ± 0.33 mas[1]
Distance88.9 ± 0.8 ly
(27.3 ± 0.2 pc)
Absolute magnitude (MV)+2.63[5]
Details
Mass1.58±0.01[6] M☉
Luminosity7.7[6] L☉
Surface gravity (log g)4.05[5] cgs
Temperature6,952[7] K
Metallicity [Fe/H]−0.01[7] dex
Rotational velocity (v sin i)77.7[5] km/s
Age1.15±0.10[7] Gyr
Other designations
σ Ser, 50 Serpentis, BD+01° 3215, FK5 1427, HD 147449, HIP 80179, HR 6093, SAO 121540[8]
Database references
SIMBADdata

Sigma Serpentis, Latinized from σ Serpentis, is a star in the equatorial constellation Serpens. It is faintly visible to the naked eye with an apparent visual magnitude of +4.82.[2] Based upon an annual parallax shift of 36.67 mas as seen from Earth, it is located 89 light years from the Sun. The star is moving closer to the Sun with a radial velocity of −49 km/s.[4]

Barry (1970) assigned this star a stellar classification of F3 V,[3] indicating an ordinary F-type main-sequence star. It is about one billion[7] years old and is spinning with a projected rotational velocity of 77.7 km/s.[5] The star has an estimated 1.58[6] times the mass of the Sun and is radiating 7.7[6] times the Sun's luminosity from its photosphere at an effective temperature of 6,952 K.[7]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Cousins1984 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Barry1970 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. ^ a b c d Cite error: The named reference Paunzen2014 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference Pace2013 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).