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: 4:45  
clear_day Transit: 12:57  
SunsetSet: 21:09 south
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All Constellations » Hydrus » 

θ Hydri (theta Hydri)

Altitude: -45.0°   Azimuth: 205.6°   Direction: South-South-West

θ Hydri is a main-sequence star in the constellation of Hydrus.

θ Hydri visual magnitude is 5.53. Because of its reltive faintness, θ 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 θ Hydri:


θ Hydri (theta Hydri) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -45.0°
Azimuth: 205.6°
Direction: South-South-West

Celestial coordinates and finder chart of θ Hydri

θ 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 θ Hydri are provided in the following table:

03h 02m 15s
-71° 54’ 09”

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

Finder chart θ Hydri (theta Hydri) star
Simplified finder chart for θ Hydri (theta Hydri).

Visibility of θ Hydri from your location

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

θ Hydri (theta Hydri) is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of θ Hydri

The image below is a photograph of θ 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 θ Hydri is 0.025 arcsec per year in Right Ascension and 0.014 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of θ Hydri (theta Hydri) star
DSS2 image of θ Hydri. The red arrow shows the motion of θ Hydri during the next 10000 years (4.17 arcmin in Right Ascension and 2.33 arcmin in declination);

Distance of θ Hydri from the Sun and relative movement

θ Hydri is distant 524.96 light years from the Sun and it is moving far from the Sun at the speed of 12 kilometers per second.

161.03 pc
524.96 ly
12 km/s
0.025 arcsec/year
0.014 arcsec/year

Spectral properties of θ Hydri

θ Hydri belongs to spectral class B3 and has a luminosity class of V corresponding to a main-sequence star.


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

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

Alternative designations of θ Hydri

θ Hydri
(theta Hydri)