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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:55  
clear_day Transit: 12:11  
SunsetSet: 17:29
sunny DaytimeWhat's Visible Now?
All Constellations » 

Hydra (The Female Water Snake) Constellation

Altitude: -38.9°   Azimuth: 294.1°   Direction: West-North-West

Hydra (pronounced ˈhaɪdrə) is the Latin name of a large constellation (in fact it extends itself for about 123 degrees across the sky) situated close to the celestial equator. As such, it is at least partly visible from both hemispheres in certain times of the year.

In English language this constellation is also known as "The Female water snake" while in astronomical texts and literature this constellation is often abbreviated as "Hya" (according to the standard of the International Astronomical Union - IAU) or as "Hyda" (according to a naming convention used by NASA).

The Latin genitive of the constellation name is "Hydrae" (pronounced ˈhaɪdriː) and it is used to identify some of the brightest stars in this constellation based on the Bayer or Flamsteed star naming convention. For instance: α Hydrae (the brightest star of Hydra based on the Bayer catalog); or 23 Hydrae (the 23th star in the constellation of Hydra based on the Flamsteed catalog).

Hydra is below the horizon from Greenwich, United Kingdom edit_location_alt.
Available Resources for Hydra

Sky Chart of Hydra Constellation

Here we provide a simplified sky chart of the Hydra constellation. Alternatively it is possible to locate Hydra in the night sky using our Online Interactive Planetarium.

Chart of  constellation
This constellation image is derivatve work based on original work by IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg) CC-BY-3.0.

Visibility of Hydra Constellation

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's Hydra rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 107.0°
Max altitude: 21.5°
Azimuth: 253.0°
Hydra is below the horizon from Greenwich, United Kingdom

The rise and set times provided here are just directional indications and they refer to a point approximately placed at the center of the constellation. In case of very large constellations (like Hydra actually is) these times can have little relevance.

Bright Stars in Hydra Constellation

The table below lists the top 20 brightest stars in the Hydra constellation. See also the complete list of 244 stars brighter than magnitude 6.5 (approximate) in the constellation of Hydra. Click on each star to see more details about it.

HR Number(*) Star designation Proper name Visual magnitude Color Notes
HR3748 α Hydrae Alphard 1.98 Variable; Multiple;
HR5020 γ Hydrae 3 Variable; Double;
HR3547 ζ Hydrae 3.11
HR4232 ν Hydrae 3.11
HR5287 π Hydrae 3.27
HR3482 ε Hydrae Ashlesha 3.38 Variable; Multiple;
HR4450 ξ Hydrae 3.54 Double;
HR3994 λ Hydrae 3.61 Multiple;
HR4094 μ Hydrae 3.81
HR3665 θ Hydrae 3.88 Variable; Multiple;
HR3314 3.9
HR3845 ι Hydrae Ukdah 3.91 Variable;
HR3903 υ1 Hydrae Zhang 4.12
HR3410 δ Hydrae 4.16 Double;
HR4552 β Hydrae 4.28 Variable; Double;
HR3454 η Hydrae 4.3 Variable;
HR3484 12 Hydrae 4.32 Double;
HR3492 ρ Hydrae 4.36 Double;
HR5526 58 Hydrae 4.41
HR3418 σ Hydrae Minchir 4.44
...go to the complete list of 244 bright stars in the constellation of Hydra

(*) HR stands for Harvard Revised Bright Star Catalogue, which is also known as the Yale Catalogue of Bright Stars.

Deep Sky Objects in Hydra Constellation

The table below lists the 20 brightest deep sky objects in the Hydra constellation. See also the complete list of 350 deep sky objects in the constellation of Hydra. The list includes objects from the Messier, New General Catalogue (NGC) and Index Catalogue (IC).

Name Type Magnitude
Messier 48 Open Cluster 5.8 (V)
Messier 83 (Southern Pinwheel Galaxy) Galaxy 7.52 (V)
NGC 3242 (Jupiter's Ghost Nebula) Planetary Nebula 7.7 (V)
Messier 68 Globular Cluster 7.96 (V)
NGC 3621 Galaxy 9.56 (V)
NGC 3923 Galaxy 9.8 (V)
NGC 2935 Galaxy 10.04 (V)
NGC 3109 Galaxy 10.04 (V)
NGC 2784 Galaxy 10.16 (V)
NGC 5061 Galaxy 10.41 (V)
NGC 5101 Galaxy 10.47 (V)
NGC 3091 Galaxy 10.61 (V)
NGC 3585 Galaxy 10.64 (B)
NGC 5694 Globular Cluster 10.89 (V)
NGC 3311 Galaxy 10.93 (V)
NGC 2986 Galaxy 10.93 (V)
NGC 3904 Galaxy 10.96 (V)
NGC 2835 Galaxy 11.03 (B)
NGC 3078 Galaxy 11.07 (V)
NGC 5085 Galaxy 11.12 (V)
...go to the complete list of 350 deep sky objects in the constellation of Hydra