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: 4:48  
clear_day Transit: 12:56  
SunsetSet: 21:05 south
wb_twilight Astronomical TwilightWhat's Visible Now
All Constellations » Hydra » 

23 Hydrae

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

23 Hydrae visual magnitude is 5.24. Because of its reltive faintness, 23 Hydrae 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 23 Hydrae:

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

Celestial coordinates and finder chart of 23 Hydrae

23 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 23 Hydrae are provided in the following table:

09h 16m 41s
-06° 21’ 11”

The simplified sky map below shows the position of 23 Hydrae in the sky:

Finder chart 23 Hydrae star
Simplified finder chart for 23 Hydrae.

Visibility of 23 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 23 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: 96.4°
Max altitude: 32.2°
Azimuth: 263.6°
23 Hydrae is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 23 Hydrae

The image below is a photograph of 23 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 23 Hydrae is 0.024 arcsec per year in Right Ascension and 0.006 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 23 Hydrae star
DSS2 image of 23 Hydrae. The red arrow shows the motion of 23 Hydrae during the next 10000 years (4.00 arcmin in Right Ascension and 1.00 arcmin in declination);

Distance of 23 Hydrae from the Sun and relative movement

23 Hydrae is distant 278.63 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

85.47 pc
278.63 ly
-8 km/s
0.024 arcsec/year
0.006 arcsec/year

Spectral properties of 23 Hydrae

23 Hydrae belongs to spectral class K2 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 23 Hydrae is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 23 Hydrae. Attribution: Richard Powell / CC BY-SA

23 Hydrae star system properties

23 Hydrae is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the 23 Hydrae double sysyem:

1.6 arcsec

Alternative designations of 23 Hydrae