56 Leonis

56 Leonis
Location of 56 Leonis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Leo
Right ascension 10h 56m 01.4690s[1]
Declination +06° 11′ 07.328″[1]
Apparent magnitude (V) 5.69 – 6.03[2]
Characteristics
Evolutionary stage red giant[3]
Spectral type M5.5III[2]
Variable type LB?[2]
Astrometry
Proper motion (μ) RA: −23.90[1] mas/yr
Dec.: −6.42[1] mas/yr
Parallax (π)8.39 ± 0.37 mas[1]
Distance390 ± 20 ly
(119 ± 5 pc)
Details
Mass1.1[4] M☉
Radius192[5] R☉
Luminosity1,479[6] L☉
Surface gravity (log g)0.64[6] cgs
Temperature3,279[6] K
Metallicity [Fe/H]+0.45[4] dex
Other designations
56 Leo, VY Leo, BD+06°2469, HD 94705, HIP 53449, HR 4267
Database references
SIMBADdata

56 Leonis is a red giant variable star located approximately 390 light years away in the constellation Leo.

A light curve for VY Leonis, plotted from Hipparcos data[7]

The apparent magnitude of 56 Leonis varies between 5.69 and 6.03, making it dimly visible to the naked eye, and it has been given the variable star designation VY Leo. The type of variability is uncertain. The General Catalogue of Variable Stars suggests it may be a slow irregular variable, but some sources have found periods and report it as semiregular.[8]

The spectral class of 56 Leonis is M5.5III, indicating a cool red giant star that has exhausted the supply of hydrogen at its core and evolved away from the main sequence. It is undecided whether it is currently on the red giant branch or asymptotic giant branch.[3] The star has an estimated 1.1[4] times the mass of the Sun but has expanded to 192 times the Sun's radius.[5] The star is radiating 1,479[6] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,279 K.[6]

  1. ^ a b c d e Cite error: The named reference hipparcos was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference gcvs was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference mcdonald2018 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference starhorse was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference kervella2022 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference lebzelter2019 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference HIPCurve was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference vsx was invoked but never defined (see the help page).