![]() Regulus is located at the lower right on this map of the constellation. |
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Observation data Epoch J2000 Equinox J2000 |
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Constellation | Leo |
Right ascension | A: 10h 08m 22.3s BC: 10h 08m 12.8/14s |
Declination | A: +11° 58′ 02″ BC: +11° 59′ 48″ |
Apparent magnitude (V) | 1.35/8.14/13.5 |
Characteristics | |
Spectral type | B7 V + K1-2 V + M5 V |
U−B color index | –0.36/+0.54 |
B−V color index | –0.11/+0.87 |
Variable type | Slightly |
Astrometry | |
Radial velocity (Rv) | +5.9 km/s |
Proper motion (μ) | RA: 249 mas/yr Dec.: 2 mas/yr |
Parallax (π) | 42.09 ± 0.79 mas |
Distance | 77 ± 1 ly (23.8 ± 0.4 pc) |
Absolute magnitude (MV) | –0.52/6.3/11.6 |
Details | |
α Leo A | |
Mass | 3.8M☉ |
Radius | 3.15–4.15R☉ |
Luminosity | 288L☉ |
Surface gravity (log g) | 3.54 ± 0.09 |
Temperature | 12,460 ± 200K |
Rotational velocity (v sin i) | 315 km/s |
Age | ≳1Gyr |
α Leo B/C | |
Mass | 0.8/0.2 M☉ |
Radius | 0.5/? R☉ |
Luminosity | 0.31 L☉ |
Other designations | |
Alpha Leonis, 32 Leo, Cor Leonis, Basilicus, Lion’s Heart, Rex, Kalb al Asad, Kabeleced, BD+12 2149/2147, GCTP 2384.00, GJ 9316, HD 87901/87884, HIP 49669, HR 3982, LTT 12716/12714, SAO 98967/98966, FK5 380.
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Database references | |
SIMBAD | data |