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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:45  
clear_day Transit: 11:48  
SunsetSet: 15:51 south
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All Constellations » Hydrus » 

β Hydri (beta Hydri)

Altitude: -38.9°   Azimuth: 183.2°   Direction: South

β Hydri is a variable sub-giant star in the constellation of Hydrus.

β Hydri visual magnitude is 2.8. Thanks to its high brightness, β Hydri is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.

The table below summarizes the key facts about β Hydri:


β Hydri (beta Hydri) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -38.9°
Azimuth: 183.2°
Direction: South

Celestial coordinates and finder chart of β Hydri

β Hydri is situated close to the southern celestial pole and, as such, it is easilty visible for most part of the year from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of β Hydri are provided in the following table:

00h 25m 45s
-77° 15’ 15”

The simplified sky map below shows the position of β Hydri in the sky:

Finder chart β Hydri (beta Hydri) star
Simplified finder chart for β Hydri (beta Hydri).

Visibility of β Hydri from your location

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

β Hydri (beta Hydri) is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of β Hydri

The image below is a photograph of β Hydri 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 β Hydri is 2.215 arcsec per year in Right Ascension and 0.324 arcsec per year in Declination and the associated displacement for the next 100 years is represented with the red arrow.

Image of β Hydri (beta Hydri) star
DSS2 image of β Hydri. The red arrow shows the motion of β Hydri during the next 100 years (3.69 arcmin in Right Ascension and 0.54 arcmin in declination);

Distance of β Hydri from the Sun and relative movement

β Hydri is distant 24.37 light years from the Sun and it is moving far from the Sun at the speed of 23 kilometers per second.

7.47 pc
24.37 ly
23 km/s
2.215 arcsec/year
0.324 arcsec/year

Spectral properties of β Hydri

β Hydri belongs to spectral class G2 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where β Hydri is situated in the Hertzsprung–Russell diagram.

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

Alternative designations of β Hydri

β Hydri
(beta Hydri)