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Hercules (abbr. Her, gen. Herculis)





A mythical hero famed for his 12 labors; a very large but unspectacular northern constellation. It contains the Keystone asterism, named after its shape, which is made by four of the main stars in Hercules – Epsilon, Zeta (Ruticulus), Eta, and Pi Her. See below for details of the constellation's brightest stars and interesting deep sky objects.


Hercules constellation
Hercules. © 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. ( ° ' '' )
Beta (Kornephorus) 2.78 -0.50 G8IIIa 148 16 30 13 +21 29 22
Zeta (Rutilicus) 2.81 2.64 F9IV 35 16 41 17 +31 36 10
Alpha (Rasalgethi) 3.00 -0.02 M5Ib-II 382 17 14 39 +14 23 25
Delta (Sarin) 3.12 1.21 A3IV 79 17 15 02 +24 50 21
Pi 3.16 -2.10 K3IIab 367 17 15 03 +36 48 33
Mu 3.42 3.80 G5IV 27 17 46 27 +27 43 15
Nu 3.48 0.80 G8II 112 16 42 54 +38 55 20
Xi 3.70 0.20 G8III 163 17 57 46 +29 14 52
Gamma 3.70 0.61 K0III 135 16 21 55 +19 09 11
Iota 3.82 -2.09 B3V 495 17 39 28 +46 00 23
Omicron 3.84 -1.30 B9.5V 347 18 07 32 +28 45 45
109 3.85 0.87 K2.5IIIab 128 18 23 42 +21 46 11
Theta 3.86 -2.70 K1IIaCN 670 17 56 15 +37 15 02
Tau 3.91 -1.02 B5IV 315 16 19 44 +46 18 48
Epsilon 3.92 0.43 A0V 163 17 00 17 +30 55 35


Other objects of interest
Name Type of Object Notes
Hercules X-1 star See separate entry
NGC 6210 planetary nebula A bright inner ring surrounded by a faint outer ring. Magnitude 9.7; diameter 13" × 20" (inner), 20" × 43" (outer); R.A. 16h 44.5m, Dec. +23° 49'
Great Cluster in Hercules globular cluster M13 (NGC 6205). See separate entry
M92 (NGC 6341) globular cluster NGC 5139. See separate entry


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