Sky Tonight
ST
Location settings
Santa Clara, US
37.4°/-122°
GMT -9
Waxing01:12 - 03:52
⌕
Go to My SkyLog in
☾
☰
Sky-Tonight.com / Constellations / Hydra
  • 🌐 EN
    ENDEESFRPT中文
  • Tonight
    • Brightest Planets and Stars Tonight
    • Milky Way Tonight
  • Solar System
    • Sun
    • Real-Time Sun Map
    • Sunspots Activity
    • Aurora Activity
    • Moon
    • Interactive Lunar Map
    • Planets
    • Mercury
    • Venus
    • Mars
    • Jupiter
    • Saturn
    • Satellite Flyovers
    • ISS
    • Close Approaches
  • Small Bodies
    • Asteroids
    • Comets
    • Recently Updated Comets
  • Stars
    • Brightest Stars
  • Meteor Showers
    • Active Meteor Showers
    • Major Meteor Showers
  • Solar Eclipses
    • Future Solar Eclipses
    • Past Solar Eclipses
  • Lunar Eclipses
    • Future Lunar Eclipses
    • Past Lunar Eclipses
  • Deep Sky Objects
    • Seasonal Nebulae
    • Messier Objects
    • Nebulae
    • Star Clusters
    • Galaxies
  • Double Stars
    • Naked-eye
    • Binocular
    • Physical pairs
    • Color-contrasting
    • Triple systems
    • Multiple systems
  • Constellations
    • Visible Tonight
    • Seasonal
    • Ecliptic
    • All 88 Constellations
  • Maps
    • Mars Map
    • Mercury Map
    • Earth
    • Cloud Cover Map
  • Contact Us
    • Feedback

Observation Settings

Or select it on the map:
This Earth map lets you select the observer’s location used to calculate the bearing and elevation of celestial objects. The selected point determines how the sky, rise and set times, and object positions are shown.
Your location: Santa Clara, United States
Timezone:
Latitude:
37.3541
Longitude:
-121.955

Hydra Constellation

Double-click to unlock the map.
Hydra, the water snake, is the largest constellation, stretching across the southern and northern hemispheres. It represents a serpent, and its brightest star is Alphard.

Hydra (The Water Serpent)

Hydra is the largest constellation in the night sky, stretching across both the northern and southern celestial hemispheres. Representing a water serpent in mythology, Hydra is a sprawling constellation that winds across the heavens. Despite its size, Hydra has relatively few bright stars, making it less conspicuous than other large constellations. It is best observed during the spring months in the Northern Hemisphere.

Key Features

  • Bright Stars: Hydra contains several notable stars:
    • Alphard (Alpha Hydrae): The brightest star in Hydra, a solitary orange giant located about 177 light-years away. Its name means "the solitary one" in Arabic, reflecting its isolation in the constellation.
    • Zeta Hydrae: A yellow giant star situated approximately 167 light-years away, marking the serpent's "head."
    • Gamma Hydrae: Another bright star in the constellation, located about 132 light-years away.
  • Deep-Sky Objects: Hydra is home to several fascinating celestial objects:
    • Messier 48 (M48): An open cluster of stars located about 1,500 light-years away, visible with binoculars.
    • Messier 68 (M68): A globular cluster of stars located about 33,000 light-years away.
    • NGC 3242: Also known as the "Ghost of Jupiter," a planetary nebula resembling a giant planet in appearance.

Mythological Background

In Greek mythology, Hydra represents the Lernaean Hydra, a multi-headed serpent that Hercules was tasked to slay as one of his twelve labors. The Hydra was said to grow two heads for every one that was severed, making it nearly invincible. Hercules eventually defeated the creature by cauterizing the stumps of its heads to prevent regeneration.

The constellation is often depicted with Corvus, the crow, and Crater, the cup, both of which share a mythological connection to the Hydra in stories of Apollo.

Cultural Significance

Hydra's vast size and mythological associations have made it a subject of fascination for stargazers and storytellers throughout history. Its brightest star, Alphard, has been referenced in various cultural traditions, often symbolizing solitude and resilience.

Though its stars are mostly faint, Hydra’s rich array of deep-sky objects attracts astronomers, while its mythological ties ensure its place in cultural lore. The constellation serves as a reminder of the legends and challenges that connect humanity to the stars.

Hydra Rise and Set Timetable

TimeElevation
Moonset18:26-40°
Astronomical observing session begins01:12-49°
Astronomical observing session ends03:52-18°
Hydra rise05:28
Moonrise, 9.3% illuminated 07:3119°
Hydra transit10:1129°

Track Hydra position throughout the night

← 14 September 2026 →

Elevation (degrees)
Time
Altitude
Azimuth
Shift the map to change the time and observe Hydra changing position in the night sky.

Annual motion of Hydra

Time
DateTue, 15 September 2026
Twilight start18:40
Twilight end03:15
Twilight duration9h 35m
Rise05:24
Set14:50
Elevation at transit29°
Transit time10:07
Equatorial coordinatesRA: 10h 38m 59s", Dec: -23° 09' 11s