R Leonis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h 47m 33.4840s |
| Declination | +11° 25′ 43.823″ |
| Apparent magnitude (V) | 4.4 - 11.3 |
| Characteristics | |
| Spectral type | M6e-M8IIIe-M9.5e |
| Apparent magnitude (J) | −0.7 |
| B−V color index | 1.26 |
| Variable type | Mira variable |
| Astrometry | |
| Proper motion (μ) | RA: 6.132 mas/yr Dec.: −53.097 mas/yr |
| Parallax (π) | 14.0566±0.8378 mas |
| Distance | 372 ly (114 pc) |
| Details | |
| Mass | 0.7 M☉ |
| Radius | 320 – 350 R☉ |
| Luminosity | 3,537 L☉ |
| Temperature | 2,930 – 3,080 K |
| Other designations | |
| R Leo, AAVSO 0942+11, BD+12°2096, HD 84748, HIP 48036, HR 3882, SAO 98769 | |
| Database references | |
| SIMBAD | data |
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 2,930 – 3,080 kelvins and radius spans 320 solar radii (220,000,000 kilometres; 1.5 astronomical units), roughly Mars's orbital zone.