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Hydra (abbr. Hya, gen. Hydrae)





The Water Serpent. Hydra is the largest constellation of all (following the dismantling of Argo Navis), stretching across a huge swathe of the southern sky. See below for details of the constellation's brightest stars and interesting deep sky objects.


Hydra constellation
Hydra. © 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 (Alphard) 1.99 -1.69 K3III 177 09 27 35 -08 39 31
Gamma 2.99 -0.55 G8IIIa 132 13 18 55 -23 10 17
Zeta 3.11 -0.22 G8III 151 08 55 24 +05 56 44
Nu 3.11 -0.03 K0III 139 10 49 37 -16 11 37
Pi 3.25 0.75 K2III-IIIbCN 101 14 06 22 -26 40 56
Epsilon 3.38 0.29 G0III 135 08 46 47 +06 25 07
Xi 3.54 0.55 G8III 129 11 33 00 -31 51 27
Lambda 3.61 0.88 K0IIICN 115 10 10 35 -12 21 15
Mu 3.83 -0.58 K4.5III 248 10 26 05 -16 50 11
Theta 3.89 0.90 B9.5V 129 09 14 22 +02 18 51


Other objects of interest
Name Type of Object Notes
Ghost of Jupiter planetary nebula NGC 3242. See separate entry
M48 (NGC 2548) open cluster On the boundary of Hydra and Monoceros and at the edge of naked-eye visibility. Magnitude 5.8; diameter 54'; R.A. 08h 13.8m, Dec. -05° 48'
M68 (NGC 4590) globular cluster Discovered by Pierre Méchain in 1780. Magnitude 8.2; diameter 12'; distance 39,000 light-years; R.A. 12h 39.5m, Dec. -26° 45'
M83 (NGC 5236) galaxy A face-on type Sc spiral just outside the Local Group. Magnitude 8.2; distance 8.5 million light-years; R.A. 13h 37.0m, Dec. -29° 52'


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