83 Leonis

Coordinates: Sky map 11h 26m 45.32s, +03° 00′ 47.18″
Source: Wikipedia, the free encyclopedia.
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
Distance
59.23 ± 0.03 ly
(18.16 ± 0.01 pc)
Details
83 Leonis A
Gyr
HR 4414, Wolf 393[11]
Database references
SIMBADHD 99491
HD 99492

83 Leonis, abbreviated 83 Leo, is a

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]

Stellar system

The primary component, 83 Leonis A, is a 6th magnitude star. It is not visible to the unaided eye, but easily visible with small binoculars. The star is classified as a subgiant, meaning that it has ceased fusing hydrogen in its core and started to evolve towards red gianthood.

The secondary component, 83 Leonis B, is an 8th magnitude orange dwarf, somewhat less massive (0.88 MSun), smaller and cooler than the Sun.

projected separation between the stars is 515 AU, but the true separation may be much higher.[14]

There is yet another, magnitude 14.4 component listed in the Washington Double Star Catalog. However, this star is moving into a different direction and is therefore not a true member of the 83 Leonis system.

Planetary system

Planet

radial velocity method to detect planets. The planet's minimum mass is less than half of the mass of Saturn. It orbits very close to the star, completing one orbit in about 17 days.[12]

In 2010, a second planet, 83 Leonis Bc, was claimed,[5] but was found to be a false positive in 2016.[3] However, in 2023 a different second planet was discovered, also given the designation "c".[10]

The 83 Leonis B planetary system[3][10]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥25.5±0.6 M🜨 0.123±0.001 17.0503±0.0016 0.034+0.025
−0.021 		— —
c ≥17.9±1.3 M🜨 — 95.233+0.098
−0.096 		0.063+0.060
−0.040 		— —

See also

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  3. ^
    S2CID 16443458
    .
  4. doi:10.1086/164207
    .
  5. ^
    S2CID 59065004
    .
  6. ^
    doi:10.1111/j.1365-2966.2009.16182.x
    .
  7. ^
    doi:10.3847/1538-3881/153/1/21
    . 21.
  8. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  9. S2CID 18478960
    .
  10. ^
    S2CID 260775534
    .
  11. ^ "83 Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 February 2018.
  12. ^
    S2CID 5803173
    .
  13. ^ "The Planet Around HD 99492". California & Carnegie Planet Search. Archived from the original on 2005-12-16. Retrieved 2006-05-09.
  14. S2CID 5669768
    .

External links


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