Phi Serpentis

Phi Serpentis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Serpens
Right ascension 15h 57m 14.57093s[1]
Declination +14° 24′ 52.1359″[1]
Apparent magnitude (V) +5.55[2]
Characteristics
Spectral type K1 IV[3]
U−B color index +0.997[2]
B−V color index +1.142[2]
Astrometry
Radial velocity (Rv)−70.98±0.17[3] km/s
Proper motion (μ) RA: −122.48[1] mas/yr
Dec.: +88.16[1] mas/yr
Parallax (π)13.52 ± 0.44 mas[1]
Distance241 ± 8 ly
(74 ± 2 pc)
Absolute magnitude (MV)+1.33[3]
Details
Mass1.19[3] M☉
Radius4.2[4] R☉
Luminosity41.7[5] L☉
Surface gravity (log g)2.65±0.09[6] cgs
Temperature4,493±22[6] K
Metallicity [Fe/H]0.01±0.05[6] dex
Rotational velocity (v sin i)2.0[7] km/s
Age3.42[5] Gyr
Other designations
φ Ser, BD+14° 2969, HD 142980, HIP 78132, HR 5940, SAO 101834.[8]
Database references
SIMBADdata

Phi Serpentis (φ Ser, φ Serpentis) is a solitary[9] star in the Serpens Caput portion of the equatorial constellation Serpens. Based upon an annual parallax shift of 13.52 mas as seen from Earth, it is located about 241 light years distant. The star is faintly visible to the naked eye with an apparent visual magnitude of +5.55.[2]

At the estimated age of 3.42 billion years,[5] this is an evolved K-type subgiant star with a stellar classification of K1 IV.[3] It has about 1.19[3] times the mass of the Sun and around 4.2[4] times the Sun's radius. The star radiates 41.7[5] times the solar luminosity from its photosphere at an effective temperature of 4,493 K.[6]

  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 Jennens1975 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Hekker2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Wu2011 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Massarotti2008 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 Eggleton2008 was invoked but never defined (see the help page).