83 Leonis

83 Leonis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Leo
83 Leonis A
Right ascension 11h 26m 45.32173s[1]
Declination +03° 00′ 47.1566″[1]
Apparent magnitude (V) 6.49
83 Leonis B
Right ascension 11h 26m 46.27833s[2]
Declination +03° 00′ 22.7567″[2]
Apparent magnitude (V) 7.58[3]
Characteristics
Spectral type G9IV-V[4] / K2V[5]
U−B color index 1.024 (83 Leonis B)[6]
B−V color index 0.913 (83 Leonis B)[6]
Variable type None
Astrometry
83 Leonis A
Radial velocity (Rv)4.18±0.13[1] km/s
Proper motion (μ) RA: −725.963(29) mas/yr[1]
Dec.: 180.980(30) mas/yr[1]
Parallax (π)55.0090 ± 0.0240 mas[1]
Distance59.29 ± 0.03 ly
(18.179 ± 0.008 pc)
83 Leonis B
Radial velocity (Rv)3.63±0.13[2] km/s
Proper motion (μ) RA: −728.131(34) mas/yr[2]
Dec.: 188.554(27) mas/yr[2]
Parallax (π)55.0618 ± 0.0304 mas[2]
Distance59.23 ± 0.03 ly
(18.16 ± 0.01 pc)
Details
83 Leonis A
Mass0.95 ± 0.06[7] M☉
Radius0.96+0.04
−0.02[8] R☉
Luminosity0.74[7] L☉
Surface gravity (log g)4.42[7] cgs
Temperature5509 ± 8.6[9] K
Metallicity0.30[7]
Age8.09 ± 6.75[7] Gyr
83 Leonis B
Mass0.85±0.02[3] M☉
Radius0.78±0.02[3] R☉
Luminosity (bolometric)0.418 ± 0.057[5] L☉
Surface gravity (log g)4.57±0.06[3] cgs
Temperature4929±44[3] K
Metallicity0.3±0.03[3]
Rotation40-45 days[10]
Rotational velocity (v sin i)0.41±0.5[3] km/s
Age4.8±4.1[3] Gyr
Other designations
BD+03° 2502/3, GJ 429, HD 99491/99492, HIP 55846, HR 4414, Wolf 393[11]
Database references
SIMBADHD 99491
HD 99492

83 Leonis, abbreviated 83 Leo, is a binary star system approximately 59 light-years away in the constellation of Leo (the Lion). The primary star of the system is a cool orange subgiant star, while the secondary star is an orange dwarf star. The two stars are separated by at least 515 astronomical units from each other. Both stars are presumed to be cooler than the Sun.

The primary star is also known as HD 99491 and the secondary star as HD 99492. In 2005, an exoplanet was confirmed to be orbiting the secondary star within the system.[12]

  1. ^ a b c d e Cite error: The named reference GaiaDR3A was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR3B was invoked but never defined (see the help page).
  3. ^ a b c d e f g h Cite error: The named reference Kane2016 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Abt1986 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Meschiari2011 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Koen2010 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference Luck2017 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference GaiaDR2A was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Koytyukh2003 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Stalport2023 was invoked but never defined (see the help page).
  11. ^ "83 Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 February 2018.
  12. ^ Cite error: The named reference Marcy2005 was invoked but never defined (see the help page).