87 Leonis

This article is about e Leonis. Not to be confused with ε (epsilon) Leonis.
87 Leonis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Leo
Right ascension 11h 30m 18.89196s[1]
Declination −03° 00′ 12.5712″[1]
Apparent magnitude (V) 4.77[2]
Characteristics
Spectral type K3+ III Fe−0.5[3]
U−B color index +1.529±0.016[2]
B−V color index +1.54[4]
R−I color index +0.84[4]
Astrometry
Radial velocity (Rv)18.8±0.8[2] km/s
Proper motion (μ) RA: 20.901[1] mas/yr
Dec.: −17.944[1] mas/yr
Parallax (π)6.7249 ± 0.2901 mas[1]
Distance480 ± 20 ly
(149 ± 6 pc)
Absolute magnitude (MV)−1.56[2]
Details
Radius54[1] R☉
Luminosity641[1] L☉
Surface gravity (log g)1.56±0.20[5] cgs
Temperature4,001±32[5] K
Metallicity [Fe/H]−0.24±0.07[5] dex
Rotational velocity (v sin i)≤ 19[4] km/s
Other designations
e Leonis, 87 Leo, BD−02°3360, FK5 2917, GC 15779, HD 99998, HIP 56127, HR 4432, SAO 138238, PPM 178510[6]
Database references
SIMBADdata

87 Leonis is a single[7] star in the zodiac constellation of Leo,[6] located approximately 480[1] light years away from the Sun. It has the Bayer designation e Leonis; 87 Leonis is the Flamsteed designation. This object is visible by the naked eye as a faint orange-hued star with an apparent visual magnitude of 4.77.[2] It is moving away from the Earth with a heliocentric radial velocity of 19 km/s.[2] The star is positioned near the ecliptic and thus is subject to occultation by the Moon.[8]

This is an aging K-type giant star with a stellar classification of K3+ III Fe−0.5,[3] which means it has exhausted the hydrogen at its core and evolved away from the main sequence. The suffix notation indicates a mild underabundance of iron in the atmosphere. It has expanded to 37[9] times the Sun's radius and is radiating over a thousand[2] times the Sun's luminosity from its photosphere at an effective temperature of 4,001 K.[5]

  1. ^ a b c d e f g h Cite error: The named reference gaia_dr2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Anderson2012 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 Cite error: The named reference bsc1 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Prugniel2011 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Dunham1974 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference cadars2 was invoked but never defined (see the help page).