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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: 7:52  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
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All Constellations » Hydra » 

9 Hydrae

Altitude: -10.7°   Azimuth: 102.2°   Direction: East-South-East

9 Hydrae is a double giant star in the constellation of Hydra.

9 Hydrae visual magnitude is 4.88. Because of its moderate brightness, 9 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 9 Hydrae:


9 Hydrae is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -10.7°
Azimuth: 102.2°
Direction: East-South-East

Celestial coordinates and finder chart of 9 Hydrae

9 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 9 Hydrae are provided in the following table:

08h 41m 43s
-15° 56’ 35”

The simplified sky map below shows the position of 9 Hydrae in the sky:

Finder chart 9 Hydrae star
Simplified finder chart for 9 Hydrae.

Visibility of 9 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 9 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: 105.9°
Max altitude: 22.6°
Azimuth: 254.1°

Digitized Sky Survey image of 9 Hydrae

The image below is a photograph of 9 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 9 Hydrae is 0.001 arcsec per year in Right Ascension and -0.098 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 9 Hydrae star
DSS2 image of 9 Hydrae. The red arrow shows the motion of 9 Hydrae during the next 1000 years (0.02 arcmin in Right Ascension and -1.63 arcmin in declination);

Distance of 9 Hydrae from the Sun and relative movement

9 Hydrae is distant 204.01 light years from the Sun and it is moving towards the Sun at the speed of 2 kilometers per second.

62.58 pc
204.01 ly
-2 km/s
0.001 arcsec/year
-0.098 arcsec/year

Spectral properties of 9 Hydrae

9 Hydrae belongs to spectral class G9 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 9 Hydrae is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 9 Hydrae. Attribution: Richard Powell / CC BY-SA

9 Hydrae star system properties

9 Hydrae is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the 9 Hydrae double sysyem:

31 arcsec

Alternative designations of 9 Hydrae