Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:46  
clear_day Transit: 12:56  
SunsetSet: 21:07 south
sunny DaytimeWhat's Visible Now
All Constellations » Hydra » 

20 Hydrae

Altitude: -4.5°   Azimuth: 98.4°   Direction: East

20 Hydrae is a bright giant star in the constellation of Hydra.

20 Hydrae visual magnitude is 5.46. Because of its reltive faintness, 20 Hydrae should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about 20 Hydrae:

Bright giant

20 Hydrae is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -4.5°
Azimuth: 98.4°
Direction: East

Celestial coordinates and finder chart of 20 Hydrae

20 Hydrae is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 20 Hydrae are provided in the following table:

09h 09m 35s
-08° 47’ 16”

The simplified sky map below shows the position of 20 Hydrae in the sky:

Finder chart 20 Hydrae star
Simplified finder chart for 20 Hydrae.

Visibility of 20 Hydrae from your location

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

Today's 20 Hydrae 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: 98.8°
Max altitude: 29.7°
Azimuth: 261.2°
20 Hydrae is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 20 Hydrae

The image below is a photograph of 20 Hydrae from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of 20 Hydrae is -0.019 arcsec per year in Right Ascension and -0.01 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 20 Hydrae star
DSS2 image of 20 Hydrae. The red arrow shows the motion of 20 Hydrae during the next 10000 years (-3.17 arcmin in Right Ascension and -1.67 arcmin in declination);

Distance of 20 Hydrae from the Sun and relative movement

20 Hydrae is distant 641.73 light years from the Sun and it is moving far from the Sun at the speed of 26 kilometers per second.

196.85 pc
641.73 ly
26 km/s
-0.019 arcsec/year
-0.01 arcsec/year

Spectral properties of 20 Hydrae

20 Hydrae belongs to spectral class G8 and has a luminosity class of II corresponding to a bright giant star.


The red dot in the diagram below shows where 20 Hydrae is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 20 Hydrae. Attribution: Richard Powell / CC BY-SA

Alternative designations of 20 Hydrae