Lambda Pyxidis

Lambda Pyxidis
Location of λ Pyxidis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pyxis
Right ascension 09h 23m 12.25099s[1]
Declination −28° 50′ 01.9420″[1]
Apparent magnitude (V) 4.68[2]
Characteristics
Spectral type G8.5 IIIb Fe−1[3]
U−B color index +0.63[2]
B−V color index +0.91[2]
Astrometry
Radial velocity (Rv)+10.2[4] km/s
Proper motion (μ) RA: −128.25[1] mas/yr
Dec.: +20.70[1] mas/yr
Parallax (π)16.98 ± 0.24 mas[1]
Distance192 ± 3 ly
(58.9 ± 0.8 pc)
Absolute magnitude (MV)+1.14[5]
Details
Mass2.06[4] M☉
Luminosity49[4] L☉
Surface gravity (log g)3.04±0.06[6] cgs
Temperature5,126±22[6] K
Metallicity [Fe/H]−0.05±0.02[6] dex
Rotational velocity (v sin i)4.4±0.2[5] km/s
Age1.3[4] Gyr
Other designations
λ Pyx, CPD−28° 3717, FK5 2747, HD 81169, HIP 46026, HR 3733, SAO 177374[7]
Database references
SIMBADdata

Lambda Pyxidis (λ Pyxidis) is a yellow-hued star in the southern constellation of Pyxis. It is visible to the naked eye, having an apparent visual magnitude of 4.68.[2] Based upon an annual parallax shift of 16.98 mas as seen from Earth,[1] it is located around 192 light years from the Sun.

Measurements of changes in the star's proper motion over time indicate this is an astrometric binary system. The visible component is an evolved G-type giant star with a stellar classification of G8.5 IIIb Fe−1[3] and a spectrum that displays an underabundance of iron with weak cyanogen lines.[8] It is a red clump star that is generating energy through the fusion of helium at its core.[9]

Lambda Pyxidis has double the mass of the Sun and is an estimated 1.3 billion years old.[4] It is radiating 49[4] times the Sun's luminosity from its photosphere at an effective temperature of 5,126 K.[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 Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference luck2015 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference vonEiff2012 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Alves2015 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 Luck1991 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).