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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: 7:38  
clear_day Transit: 11:46  
SunsetSet: 15:54 south
sleep NighttimeWhat's Visible Now?
All Constellations » Hydra » 

η Hydrae (eta Hydrae)

Altitude: -6.2°   Azimuth: 76.6°   Direction: East-North-East

η Hydrae is a variable main-sequence star in the constellation of Hydra.

η Hydrae visual magnitude is 4.3. Because of its moderate brightness, η Hydrae should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about η Hydrae:


η Hydrae (eta Hydrae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -6.2°
Azimuth: 76.6°
Direction: East-North-East

Celestial coordinates and finder chart of η Hydrae

η 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 η Hydrae are provided in the following table:

08h 43m 13s
+03° 23’ 54”

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

Finder chart η Hydrae (eta Hydrae) star
Simplified finder chart for η Hydrae (eta Hydrae).

Visibility of η 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 η Hydrae (eta 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: 86.6°
Max altitude: 41.9°
Azimuth: 273.4°

Digitized Sky Survey image of η Hydrae

The image below is a photograph of η 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 η Hydrae is -0.019 arcsec per year in Right Ascension and -0.001 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of η Hydrae (eta Hydrae) star
DSS2 image of η Hydrae. The red arrow shows the motion of η Hydrae during the next 10000 years (-3.17 arcmin in Right Ascension and -0.17 arcmin in declination);

Distance of η Hydrae from the Sun and relative movement

η Hydrae is distant 466.38 light years from the Sun and it is moving far from the Sun at the speed of 17 kilometers per second.

143.06 pc
466.38 ly
17 km/s
-0.019 arcsec/year
-0.001 arcsec/year

Spectral properties of η Hydrae

η Hydrae 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 η Hydrae is situated in the Hertzsprung–Russell diagram.

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

Alternative designations of η Hydrae

η Hydrae
(eta Hydrae)