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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
sunny DaytimeWhat's Visible Now?
All Constellations » Hydra » 

Zhang - υ1 Hydrae (upsilon1 Hydrae)

Altitude: 1.4°   Azimuth: 243.7°   Direction: West-South-West

Zhang, also designated as υ1 Hydrae (upsilon1 Hydrae), is a giant star in the constellation of Hydra.

Zhang visual magnitude is 4.12. Because of its moderate brightness, Zhang 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 Zhang:


Zhang - υ1 Hydrae (upsilon1 Hydrae) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 1.4°
Azimuth: 243.7°
Direction: West-South-West

Celestial coordinates and finder chart of Zhang

Zhang 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 Zhang are provided in the following table:

09h 51m 28s
-14° 50’ 48”

The simplified sky map below shows the position of Zhang in the sky:

Finder chart Zhang - υ1 Hydrae (upsilon1 Hydrae) star
Simplified finder chart for Zhang - υ1 Hydrae (upsilon1 Hydrae).

Visibility of Zhang 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 Zhang - υ1 Hydrae (upsilon1 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: 104.8°
Max altitude: 23.7°
Azimuth: 255.2°

Digitized Sky Survey image of Zhang

The image below is a photograph of Zhang 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 Zhang is 0.017 arcsec per year in Right Ascension and -0.026 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of Zhang - υ1 Hydrae (upsilon1 Hydrae) star
DSS2 image of Zhang. The red arrow shows the motion of Zhang during the next 10000 years (2.83 arcmin in Right Ascension and -4.33 arcmin in declination);

Distance of Zhang from the Sun and relative movement

Zhang is distant 273.49 light years from the Sun and it is moving towards the Sun at the speed of 15 kilometers per second.

83.89 pc
273.49 ly
-15 km/s
0.017 arcsec/year
-0.026 arcsec/year

Spectral properties of Zhang

Zhang belongs to spectral class G7 and has a luminosity class of III corresponding to a giant star.


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

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

Alternative designations of Zhang

υ1 Hydrae
(upsilon1 Hydrae)