Pi Leonis

π Leonis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Leo
Right ascension 10h 00m 12.80589s[1]
Declination +08° 02′ 39.2032″[1]
Apparent magnitude (V) 4.70[2]
Characteristics
Spectral type M2 III[3]
U−B color index +1.88[2]
B−V color index +1.60[2]
Astrometry
Radial velocity (Rv)22.36±0.29[4] km/s
Proper motion (μ) RA: −31.41[1] mas/yr
Dec.: −22.15[1] mas/yr
Parallax (π)8.03 ± 0.29 mas[1]
Distance410 ± 10 ly
(125 ± 4 pc)
Absolute magnitude (MV)−0.79[5]
Details
Mass1.64[6] M☉
Radius84.7[6] R☉
Luminosity1,077±73[7] L☉
Surface gravity (log g)1.028[8] cgs
Temperature3,757[8] K
Metallicity [Fe/H]+0.447[8] dex
Age550[9] Myr
Other designations
π Leo, 29 Leonis, BD+08°2301, HD 86663, HIP 49029, HR 3950, SAO 118044[10]
Database references
SIMBADdata

Pi Leonis, Latinised from π Leonis, is a single[11] star in the zodiac constellation Leo. It is a red-hued star that is visible to the naked eye with an apparent visual magnitude of 4.70.[2] This object is located at a distance of some 410 light-years from the Sun based on parallax, and is drifting further away with a radial velocity of +22 km/s.[4] Because the star lies near the ecliptic it is subject to occultations by the Moon.[12]

This is an evolved, red giant star with a stellar classification of M2 III.[3] With the supply of hydrogen at its core exhausted, it has expanded to 70 times the Sun's radius. The star shines with 1,077 times the luminosity of the Sun from an expanded outer atmosphere that has an effective temperature of 3,757 K. According to the General Catalogue of Variable Stars, it is a suspected variable star with a maximum magnitude of 4.67.[13] The age of Pi Leonis is estimated at 550 million years.[9]

  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 Cite error: The named reference Morgan1973 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Famaey2009 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 Cite error: The named reference kervella2022 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference cardiel2021 was invoked but never defined (see the help page).
  9. ^ a b Guide, Universe (2015-01-25). "Pi Leonis Star Facts (Type, Distance, Magnitude, Colour, Luminosity, Location & more)". Universe Guide. Retrieved 2022-05-01.
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference White1987 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference cgcvs2007 was invoked but never defined (see the help page).