Hydra (constellation)

Hydra is the lairgest o the 88 modren constellations, measurin 1303 square degrees. An aa ane o the langest at ower 100 degrees, its soothern end abuts Libra an Centaurus an its northren end borders Cancer.[1] It haes a lang history, havin been includit amang the 48 constellations leetit bi the 2nt century astronomer Ptolemy. It is commonly representit as a watter snake. It should nae be confused wi the similarly named constellation o Hydrus.

Hydra
Constellation
Hydra
AbbreviationHya
GenitiveHydrae
Pronunciation
Seembolismthe sea serpent
Richt ascension8–15 h
Declination−20°
QuadrantSQ2
Aurie1303 sq. deg. (1st)
Main starns17
Bayer/Flamsteed
stars
75
Starns wi planets16
Starns brichter than 3.00m2
Starns within 10.00 pc (32.62 ly)4
Brichtest starnAlphard (α Hya) (1.98m)
Nearest starnLHS 3003
(20.67 ly, 6.34 pc)
Messier objects3
Meteor showers
  • Alpha Hydrids
  • Sigma Hydrids
Borderin
constellations
Veesible at latitudes atween +54° an −83°.
Best veesible at 21:00 (9 p.m.) durin the month o Aprile.

ReferencesEedit

  1. Ridpath & Tirion 2001, pp. 158–160.

Coordinates:   10h 00m 00s, −20° 00′ 00″