Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
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All Constellations » Hydrus » 

α Hydri (alpha Hydri)

α Hydri is a hypergiant star in the constellation of Hydrus.

α Hydri visual magnitude is 2.86. Thanks to its high brightness, α 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 α Hydri:

α Hydri (alpha Hydri) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of α Hydri

α Hydri is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of α Hydri are provided in the following table:

01h 58m 46s
-61° 34’ 10”

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

Finder chart α Hydri (alpha Hydri) star
Simplified finder chart for α Hydri (alpha Hydri).

Visibility of α Hydri from your location

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

α Hydri (alpha Hydri) is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of α Hydri

The image below is a photograph of α 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 α Hydri is 0.264 arcsec per year in Right Ascension and 0.027 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of α Hydri (alpha Hydri) star
DSS2 image of α Hydri. The red arrow shows the motion of α Hydri during the next 1000 years (4.40 arcmin in Right Ascension and 0.45 arcmin in declination);

Distance of α Hydri from the Sun and relative movement

α Hydri is distant 71.27 light years from the Sun and it is moving far from the Sun at the speed of 1 kilometers per second.

21.86 pc
71.27 ly
1 km/s
0.264 arcsec/year
0.027 arcsec/year

Spectral properties of α Hydri

α Hydri belongs to spectral class F0 and has a luminosity class of V corresponding to a hypergiant star.


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

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

Alternative designations of α Hydri

α Hydri
(alpha Hydri)