Lambda Piscium

Lambda Piscium
Location of λ Piscium (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pisces
Right ascension 23h 42m 02.80612s[1]
Declination +01° 46′ 48.1484″[1]
Apparent magnitude (V) 4.49[2]
Characteristics
Spectral type A7 V[3]
U−B color index +0.09[2]
B−V color index +0.20[2]
Astrometry
Radial velocity (Rv)6.7[4] km/s
Proper motion (μ) RA: −129.70[1] mas/yr
Dec.: −154.80[1] mas/yr
Parallax (π)30.59 ± 0.19 mas[1]
Distance106.6 ± 0.7 ly
(32.7 ± 0.2 pc)
Absolute magnitude (MV)+1.92[5]
Details
Mass1.806[3] M☉
Radius2.0403±0.0451[3] R☉
Luminosity13.3897±0.1692[3] L☉
Surface gravity (log g)4.08[4] cgs
Temperature7,734±80[3] K
Metallicity [Fe/H]0.02[4] dex
Rotational velocity (v sin i)70[6] km/s
Age583±20[6] Myr
Other designations
λ Psc, 18 Piscium, BD+00° 5037, FK5 1620, HD 222603, HIP 116928, HR 8984, SAO 128336[7]
Database references
SIMBADdata

Lambda Piscium, Latinized from λ Piscium, is a solitary,[8] white-hued star in the zodiac constellation of Pisces. With an apparent visual magnitude of 4.49,[2] it is visible to the naked eye, forming the southeast corner of the "Circlet" asterism in Pisces. Based upon a measured annual parallax shift of 30.59 mas as seen from Earth,[1] it is located 107 light years distant from the Sun. Lambda Piscium 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.[9]

This well-studied star[4] has a stellar classification A7 V,[3] indicating it is an A-type main-sequence star that is generating energy through hydrogen fusion at its core. It has 1.8 times the mass of the Sun and double the Sun's radius. The star is radiating 13.3 times the Sun's luminosity from its photosphere at an effective temperature of 7,734 K.[3] Lambda Piscium is around 583 million years old and is spinning with a projected rotational velocity of 70 km/s.[6]

  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 Cite error: The named reference Argue1966 was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference Boyajian2013 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Gebran2016 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 Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Chupina2006 was invoked but never defined (see the help page).