Regulus A/B/C

Regulus is located at the lower right on this map of the constellation.
Observation data
Epoch J2000      Equinox J2000
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.
Database references
SIMBAD data

Get more info about Regulus in Wikipedia

This article uses material from the Wikipedia article
Regulus, which is released under the Creative Commons Attribution-Share-Alike License 3.0