Your guide to the Solar System and the night sky
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🌎  Greenwich, United Kingdom [change]

σ Hydri (sigma Hydri)

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

σ Hydri visual magnitude is 6.16. Because of its reltive faintness, σ Hydri 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 σ Hydri:

σ Hydri (sigma Hydri) is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of σ Hydri

σ 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 σ Hydri are provided in the following table:

01h 55m 50s
-78° 20’ 53”

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

Finder chart σ Hydri (sigma Hydri) star
Simplified finder chart for σ Hydri (sigma Hydri).

Visibility of σ Hydri from your location

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

σ Hydri (sigma Hydri) is currently not visible from Greenwich, United Kingdom [change]

Digitized Sky Survey image of σ Hydri

The image below is a photograph of σ 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 σ Hydri is 0.096 arcsec per year in Right Ascension and 0.06 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of σ Hydri (sigma Hydri) star
DSS2 image of σ Hydri. The red arrow shows the motion of σ Hydri during the next 1000 years (1.60 arcmin in Right Ascension and 1.00 arcmin in declination);

Distance of σ Hydri from the Sun and relative movement

σ Hydri is distant 134.71 light years from the Sun and it is moving far from the Sun at the speed of 6 kilometers per second.

41.32 pc
134.71 ly
6 km/s
0.096 arcsec/year
0.06 arcsec/year

Spectral properties of σ Hydri

σ Hydri belongs to spectral class F5 and has a luminosity class of IV corresponding to a sub-giant star.


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

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

Alternative designations of σ Hydri

σ Hydri
(sigma Hydri)