R Leonis
Template:Location mark Location of R Leonis (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Leo |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.4 - 11.3[2] |
| Characteristics | |
| Spectral type | M6e-M8IIIe-M9.5e[2] |
| Apparent magnitude (J) | −0.7[3] |
| B−V Template:Engvar | 1.26 |
| Variable type | Mira variable |
| Astrometry | |
| Proper motion (μ) | RA: 6.132[1] mas/yr Dec.: −53.097[1] mas/yr |
| Parallax (π) | 14.0566±0.8378 mas[1] |
| Distance | 372 ly (114[4] pc) |
| Details | |
| Mass | 0.7[5] Template:Solar mass |
| Radius | 320Template:Snd350[6] Template:Solar radius |
| Luminosity | 3,537[4] Template:Solar luminosity |
| Temperature | 2,930Template:Snd3,080[6] K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist | |
| Database references | |
| SIMBAD | data |
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R Leonis is a red giant Mira-type variable star located approximately 370 light years away in the constellation Leo.
The apparent magnitude of R Leonis varies between 4.31 and 11.65 with a period of 312 days. At maximum it can be seen with the naked eye, while at minimum a telescope of at least 7 cm is needed. The star's effective temperature is estimated to be 2,930Template:Snd3,080Script error: No such module "String".kelvins and radius spans Script error: No such module "convert".,[6] roughly Mars's orbital zone.
Possible planet
In 2009 Wiesemeyer et al.[5] proposed that quasi-periodic fluctuations observed for the star R Leonis may be due to the presence of an evaporating substellar companion, probably an extrasolar planet. They have inferred a putative mass for the orbiting body of twice the mass of Jupiter, orbital period of 5.2 years and likely orbital separation of 2.7 astronomical units. If confirmed such a planetary object could likely be an evaporating planet, with a long comet-like trail as hinted by intense SiO maser emissions.
Template:OrbitboxPlanet begin Template:OrbitboxPlanet hypothetical
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References
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- ↑ a b c d e Template:Cite Gaia DR2
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