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public LocationGreenwich, UK
Sunrise: 5:00 
Transit: 13:04 
Sunset: 21:07
sunny   (Daytime)   What's Visible Now?
All Constellations » Hydra » 


Below the horizon.  Rise: 11:07 | Tran: 16:01 | Set: 20:56
Alt: -21.32°   Az: 83.03°   Direction: East

HR4158 is a double main-sequence star of spectral class F7 in the constellation of Hydra.

HR4158 visual magnitude is 5.7. Because of its faintness, HR4158 is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

HR4158 is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year.

Image of HR4158 star
DSS2 image of HR4158. The red arrow shows the motion of HR4158 during the next 1000 years (4.47 arcmin in Right Ascension and -11.22 arcmin in declination);

Celestial Coordinates


10h 37m 45s
-12° 21’ 28”
16h 44m 46s
03h 22m 32s


10h 36m 32s
-12° 13’ 49”

Galactic Coordinates


Finder Chart

Finder chart HR4158 star
Simplified finder chart for HR4158.

Magnitude, Color, Spectral Class



The red dot in the diagram below shows where HR4158 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4158. Attribution: Richard Powell / CC BY-SA

Star System Properties

HR4158 is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the HR4158 double sysyem:

14.4 arcsec

Distance, Radial Speed, Proper Motion

HR4158 is distant 80.16 light years from the Sun and it is moving towards the Sun at the speed of 6 kilometers per second.

24.59 pc
80.16 ly
-6 km/s
0.268 arcsec/y
-0.673 "/y

Alternative Designations

Gl 398.1

Visibility from Your Location

Today's HR4158 rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 102.4°
Max altitude: 26.2°
Azimuth: 257.6°