Omega Serpentis

Omega Serpentis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Serpens
Right ascension 15h 50m 17.54635s[1]
Declination +02° 11′ 47.4362″[1]
Apparent magnitude (V) +5.22[2]
Characteristics
Spectral type G8 III[3]
U−B color index +0.805[2]
B−V color index +1.02[2]
Astrometry
Radial velocity (Rv)−3.11±0.08[4] km/s
Proper motion (μ) RA: +29.15[1] mas/yr
Dec.: −47.31[1] mas/yr
Parallax (π)11.93 ± 0.28 mas[1]
Distance273 ± 6 ly
(84 ± 2 pc)
Absolute magnitude (MV)+0.49[3]
Details[4]
Mass1.20±0.24 M☉
Radius10.48±0.52 R☉
Luminosity69 L☉
Surface gravity (log g)2.88±0.03 cgs
Temperature4,797±16 K
Metallicity [Fe/H]−0.26±0.02 dex
Rotational velocity (v sin i)0.99±0.98 km/s
Age3.94±2.16 Gyr
Other designations
ω Ser, 34 Ser, BD+02° 3007, HD 141680, HIP 77578, HR 5888, SAO 121215.[5]
Database references
SIMBADdata

Omega Serpentis (ω Ser, ω Serpentis) is a solitary[6] star within the Serpens Caput part of the equatorial constellation of Serpens. It is visible to the naked eye with an apparent visual magnitude of +5.22.[2] Based upon an annual parallax shift of 11.93 mas as seen from Earth, it is located about 273 light years from the Sun. At that distance, its visual magnitude is diminished by an extinction factor of 0.19 due to interstellar dust.[4] It is a member of the Ursa Major Stream, lying among the outer parts, or corona, of this moving group of stars that roughly follow a common heading through space.[7]

With an estimated age of around four billion years,[4] Omega Serpentis is an evolved G-type giant star with a stellar classification of G8 III.[3] It is a red clump giant, which means that it is generating energy at its core through the nuclear fusion of helium.[8] The star has an estimated 120% of the Sun's mass but has expanded to 10.48 times the radius of the Sun. It is radiating 69 times the solar luminosity from its photosphere at an effective temperature of 4,797 K.[4]

  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 Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Sato2013 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference jofre2015 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Chupina2006 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Puzeras2010 was invoked but never defined (see the help page).