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Leo (abbr. Leo, gen. Leonis)





The Lion. Leo is a large, prominent constellation, the fifth of the zodiac, which dominates the northern spring sky. It lies between Virgo and Cancer and to the south of Leo Minor and Ursa Major; the Sickle asterism, formed by the stars Alpha (Regulus), Eta, Gamma (Algieba), Zeta (Adhafera), Mu, and Epsilon Leo, outlines the Lion's head. See below for details of the constellation's brightest stars and interesting deep sky objects.


Leo constellation
Leo. © 2003 Torsten Bronger.
Copied here under the terms of the GNU Free Documentation License



Stars brighter than magnitude 4.0
Star Visual
mag.
Abs.
mag.
Spectral
type
Distance
(lt-yr)
R.A. (h m s) Dec. ( ° ' '' )
Alpha (Regulus) 1.36 -0.52 B7V 77 10 08 22 +11 58 02
Gamma (Algieba) 2.01 -0.92 K1IIIbCN+G7IIICN 126 10 19 58 +19 50 30
Beta (Denebola) 2.14 1.91 A3V 36 11 49 04 +14 34 19
Delta (Zosma) 2.56 1.32 A4V 58 11 14 06 +20 31 25
Epsilon (Asad Australis) 2.97 -1.46 G0II 251 09 45 51 +23 46 27
Theta (Chort) 3.33 -0.35 A2V 178 11 14 14 +15 25 46
Zeta (Adhafera) 3.43 1.02 F0III 99 10 16 41 +23 25 02
Eta 3.48 -5.60 A0Ib 2,130 10 07 20 +16 45 45
Omicron (Subra) 3.52 0.43 A5V+F6II 135 09 41 09 +09 53 32
Rho 3.84 -7.38 B1Ib 5,720 10 32 49 +09 18 24
Mu (Rassalas) 3.88 0.83 K0IIIbCNCaBa 133 09 52 46 +26 00 25
Iota (TszE Tseang) 4.00 2.08 F2IV 79 11 23 55 +10 31 45


Other objects of interest
Name Type of Object Notes
M65 (NGC 3623) galaxy An edge-on type Sb spiral that forms a conspicuous triple with M66 and NGC 3628. Magnitude 9.3; angular size 10.0' × 3.3'; distance: 35 million light-years; R.A. 11h 18.9m, Dec. +13° 05'
M66 (NGC 3627) galaxy A physical partner of M65 and another edge-on Sb spiral. Magnitude 9.0; angular size 8.7' × 4.4'; R.A 11h 20.2m, Dec. +12° 59'
M95 (NGC 3351) galaxy A face-on type SBb barred spiral that forms a pair with M96 (see Leo I). Magnitude 9.7; angular size 7.4' × 5.1'; R.A. 10h 44.0m, Dec. +11° 42'
M96 (NGC 3368) galaxy An Sb galaxy in partnership with M95. Like all the above galaxies, it is visible
with a small telescope. Magnitude 9.2; angular size 7.1' × 5.1'; R.A. 10h 46.8,
Dec. +11° 49'
M105 (NGC 3379) galaxy A type E1 elliptical. Magnitude 9.3; angular size 4.5' × 4.0'; R.A. 10h 47.8m,
Dec. +12° 35'
Leo I, Leo II, Leo III galaxies See separate entries


Constellations
Andromeda | Antlia | Apus | Aquarius | Aquila | Ara | Aries | Auriga | Bootes | Caelum | Camelopardalis | Cancer | Canes Venatici | Canis Major | Canis Minor | Capricornus | Carina | Cassiopeia | Centaurus | Cepheus | Cetus | Chamaeleon | Circinus | Columba | Coma Berenices | Corona Austrina | Corona Borealis | Corvus | Crater | Crux | Cygnus | Delphinus | Dorado | Draco | Equuleus | Eridanus | Fornax | Gemini | Grus | Hercules | Horologium | Hydra | Hydrus | Indus | Lacerta | Leo | Leo Minor | Lepus | Libra | Lupus | Lynx | Lyra | Mensa | Microscopium | Monoceros | Musca | Norma | Octans | Ophiuchus | Orion | Pavo | Pegasus | Perseus | Phoenix | Pictor | Pisces | Piscis Austrinus | Puppis | Pyxis | Reticulum | Sagitta | Sagittarius | Scorpius | Sculptor | Scutum | Serpens | Sextans | Taurus | Telescopium | Triangulum | Triangulum Australe | Tucana | Ursa Major | Ursa Minor | Vela | Virgo | Volans | Vulpecula


Related categories

   • NOTABLE STARS
   • NEBULAE AND STAR CLUSTERS
   • GALAXIES