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Aquarius (abbr. Aqr, gen. Aquarii)





The Water-bearer; a large but quite faint southern constellation and the twelfth sign of the zodiac. It is surrounded by Pegasus, Equuleus, and Delphinus to the north, Aquila to the west, Capricornus so the sothwest, Pisces Austrinus and Sculptor to the south, and Cetus to the east. The stars Sadachbia (Gamma), Eta Aqr, Zeta Aqr, and Pi Aqr form a small Y-shaped asterism, called the Water Jar or Urn, thought to mark the Water-bearer's cup. See below for details of the constellation's brightest stars and interesting deep sky objects.


Aquarius constellation
Aquarius. © 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 (Sadalsuud) 2.90 -3.47 G0Ib 612 21 31 33 -05 34 16
Alpha (Sadalmelik) 2.95 -3.88 G2Ib 759 22 05 47 -00 19 11
Delta (Skat) 3.27 -0.18 A3V 159 22 54 39 -15 49 15
Zeta 3.65 1.14 F6IV+F3V 103 22 28 50 -00 01 12
c2 3.68 -0.60 K1III 234 23 09 27 -21 10 21
Lambda 3.73 -1.67 M2.5IIIaFe 392 22 52 37 -07 34 47
Epsilon (Albali) 3.78 -0.46 A1V 230 20 47 40 -09 29 45
Gamma (Sadachbia) 3.86 0.43 A0V 158 22 21 39 -01 23 14
b1 3.96 0.48 K0III 162 23 22 58 -20 06 02


Other objects of interest
Name Type of Object Notes
R Aqr star A symbiotic variable
V1344 Aqr star An X-ray jet variable
Helix Nebula planetary nebula NGC 7293. See separate entry
Saturn Nebula planetary nebula NGC 7009. See separate
M2 (NGC 7089) globular cluster On of the most impressive of its type; it appears in binoculars as a misty patch with a central concentration, and with a 15-cm telescope is partially resolved into stars. Magnitude 6.5, diameter 12.9', distance 37,500 light-years; R.A. 21h 31m, Dec. -01° 03'
M72 (NGC 6981) globular cluster A faint object in small telescopes. Magnitude 9.8, diameter 2', distance 55,400 light-years; R.A. 20h 52m, Dec. -12° 39'
Aquarius Dwarf galaxy See separate entry
Atoms for Peace Galaxy galaxy NGC 7252. 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