20 Leonis Minoris

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Template:Short description

20 Leonis Minoris
Observation data
Epoch J2000      Equinox J2000
Constellation Leo Minor
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +5.40[2]
Characteristics
Spectral type G3 Va Hδ1[3] + M7 V[4]
U−B Template:Engvar +0.27[5]
B−V Template:Engvar +0.65[5]
Astrometry
Radial velocity (Rv)Template:Val[6] km/s
Proper motion (μ) RA: Template:Val mas/yr[1]
Dec.: Template:Val mas/yr[1]
Parallax (π)66.9958±0.0921 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)4.46[7]
Details
20 LMi A
MassTemplate:Val[8] Template:Solar mass
RadiusTemplate:Val[8] Template:Solar radius
LuminosityTemplate:Val[8] Template:Solar luminosity
Surface gravity (log g)Template:Val[8] cgs
TemperatureTemplate:Val[9] K
Metallicity [Fe/H]Template:Val[8] dex
RotationTemplate:Val[2]
Rotational velocity (v sin i)Template:Val[8] km/s
Age6.2–7.7[10] Gyr
20 LMi B
Mass0.11[11] Template:Solar mass
TemperatureTemplate:Val[12] K
Metallicity [Fe/H]Template:Val[12] dex
Rotation19.2687 d[4]
Other designations
Template:Odlist[13]
Database references
SIMBADdata

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20 Leonis Minoris is a binary star system in the northern constellation of Leo Minor. It is faintly visible to the naked eye, having an apparent visual magnitude of +5.4.[2] Based upon an annual parallax shift of 66.996 mas, it is located 48.7 light-years from the Sun. The star has a relatively high proper motion[3] and is moving away from the Sun with a radial velocity of +56 km/s.[6] The system made its closest approach about 150,000 years ago when it came within Template:Convert.[14]

The primary member of this system is a G-type main-sequence star with a stellar classification of G3 Va Hδ1.[3] It has 12% more mass and a 25% larger radius than the Sun. The star is about seven[10] billion years old and is spinning with a rotation period of 10.6 days.[2] The small companion is an active red dwarf star that has a relatively high metallicity.[15] The two stars are currently separated by 14.5 arc seconds, corresponding to a projected separation of 2016 AU.[11]

Planetary system

File:Artist’s Illustration of Exoplanet HD 86728 b (ann24034a).jpg
Artist's impression of 20 Leonis Minoris b orbiting its star.[16]

A candidate exoplanet orbiting 20 Leonis Minoris A (HD 86728) was first detected in 2020,[17] and confirmed in 2024 as the first discovery of the NEID Earth Twin Survey (NETS). With a minimum mass of Template:Earth mass and an orbital period of 31 days, this is most likely a hot Neptune-type planet.[8]

Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:Orbitbox end

References

Template:Reflist

External links

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Template:Stars of Leo Minor

  1. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR3
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Hempelmann2016
  3. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Keenan1989
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named West2015
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named EgUBV
  6. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Gontcharov
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Holmberg2009
  8. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named Gupta2024
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa411_3_559
  10. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named apj687
  11. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Tokovinin2016
  12. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Jahandar2025
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named BailerJones2015
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named mnras311_2_385
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named NOIRLab
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Hirsch2020
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