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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
SunriseRise: 6:46  
clear_day Transit: 12:11  
SunsetSet: 17:36
wb_twilight Astronomical TwilightWhat's Visible Now?
All Constellations » Hydra » 

χ1 Hydrae (chi1 Hydrae)

Altitude: -16.6°   Azimuth: 113.1°   Direction: East-South-East

χ1 Hydrae is a double sub-giant star in the constellation of Hydra.

χ1 Hydrae visual magnitude is 4.94. Because of its moderate brightness, χ1 Hydrae should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of χ1 Hydrae is -0.188 arcsec per year in Right Ascension and -0.004 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of χ1 Hydrae (chi1 Hydrae) star
DSS2 image of χ1 Hydrae. The red arrow shows the motion of χ1 Hydrae during the next 1000 years (-3.13 arcmin in Right Ascension and -0.07 arcmin in declination);

Key facts about χ1 Hydrae


χ1 Hydrae (chi1 Hydrae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -16.6°
Azimuth: 113.1°
Direction: East-South-East

Celestial coordinates and finder chart of χ1 Hydrae

χ1 Hydrae 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 χ1 Hydrae are provided in the following table:

11h 05m 19s
-27° 17’ 36”

The simplified sky map below shows the position of χ1 Hydrae in the sky:

Finder chart χ1 Hydrae (chi1 Hydrae) star
Simplified finder chart for χ1 Hydrae (chi1 Hydrae).

Visibility of χ1 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 χ1 Hydrae (chi1 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: 117.3°
Max altitude: 11.2°
Azimuth: 242.7°

Distance of χ1 Hydrae from the Sun and relative movement

χ1 Hydrae is distant 141.86 light years from the Sun and it is moving far from the Sun at the speed of 17 kilometers per second.

43.52 pc
141.86 ly
17 km/s
-0.188 arcsec/year
-0.004 arcsec/year

Spectral properties of χ1 Hydrae

χ1 Hydrae belongs to spectral class F3 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where χ1 Hydrae is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of χ1 Hydrae. Attribution: Richard Powell / CC BY-SA

χ1 Hydrae star system properties

χ1 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 χ1 Hydrae double sysyem:

0.2 arcsec

Alternative designations of χ1 Hydrae

χ1 Hydrae
(chi1 Hydrae)
NN 3642 A