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20 Leonis Minoris

Star in the constellation Leo Minor

20 Leonis Minoris

Star in the constellation Leo Minor

| b-v=+0.65 | u-b=+0.27 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. 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 and is moving away from the Sun with a radial velocity of +56 km/s. The system made its closest approach about 150,000 years ago when it came within 9.86 pc.

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

Planetary system

Artist's impression of 20 Leonis Minoris b orbiting its star.<ref name=&quot;NOIRLab&quot;/>

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

References

| display-authors=1 | last1=West | first1=Andrew A.

| display-authors=1 | last1=Holmberg | first1=J.

| display-authors=1 | last1=Hirsch | first1=Lea A.

References

  1. {{Cite Gaia DR3. 746545172372256384
  2. Kovtyukh. (2003). "High precision effective temperatures for 181 F-K dwarfs from line-depth ratios". [[Astronomy and Astrophysics]].
  3. (November 2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal.
  4. (2000). "Two Nearby M Dwarf Binaries from 2MASS". [[Monthly Notices of the Royal Astronomical Society]].
  5. "HD 86728".
  6. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data.
  7. Gupta, Arvind F.. (2025-01-01). "The NEID Earth Twin Survey. I. Confirmation of a 31 Day Planet Orbiting HD 86728". The Astronomical Journal.
  8. Jahandar, Farbod. (2025-01-01). "Chemical Fingerprints of M Dwarfs: High-resolution Spectroscopy on 31 M Dwarfs with SPIRou". The Astrophysical Journal.
  9. . (2024-11-21). ["NEID Earth Twin Survey Delivers On Its Goal to Push the Limits of Exoplanet Discovery"](https://noirlab.edu/public/announcements/ann24034/). *[[NOIRLab]]*.
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g-type-main-sequence-stars m-type-main-sequence-stars solar-analogs binary-stars leo-minor durchmusterung-objects flamsteed-objects gliese-and-gj-objects henry-draper-catalogue-objects hipparcos-objects bright-star-catalogue-objects planetary-systems-with-one-confirmed-planet population-i-stars
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