We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
Help keep this site free and ads-free: donate now!
public LocationGreenwich, United Kingdom
Sunrise: 4:42 
Transit: 12:59 
Sunset: 21:16
sunny   (Daytime)   What's Visible Now?

Unukalhai - α Serpentis (alpha Serpentis)

Below the horizon.  Rise: 16:31 | Tran: 23:01 | Set: 5:35
Altitude: -27.0°   Azimuth: 32.8°   Direction: North-North-East

Unukalhai, also designated as α Serpentis (alpha Serpentis), is a multiple giant star of spectral class K2 in the constellation of Serpens.

Unukalhai visual magnitude is 2.65. Because of its brightness, Unukalhai is clearly visible to the naked eye when observed from locations with dark skies, and should be also quite easily visible from light polluted areas.

Celestial coordinates and finder chart of Unukalhai

Finder chart Unukalhai - α Serpentis (alpha Serpentis) star
Simplified finder chart for Unukalhai - α Serpentis (alpha Serpentis).

Unukalhai 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 Unukalhai are provided in the following table:

15h 44m 16s
+06° 25’ 32”
Image of Unukalhai - α Serpentis (alpha Serpentis) star
DSS2 image of Unukalhai. The red arrow shows the motion of Unukalhai during the next 1000 years (2.28 arcmin in Right Ascension and 0.78 arcmin in declination);

Key facts about Unukalhai


and has a luminosity class of III corresponding to a giant star.


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

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

Unukalhai star system properties

Unukalhai 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 Unukalhai double sysyem:

58.2 arcsec

Distance of Unukalhai from the Sun and relative movement

Unukalhai is distant 73.19 light years from the Sun and it is moving far from the Sun at the speed of 3 kilometers per second.

22.45 pc
73.19 ly
3 km/s
0.137 arcsec/year
0.047 arcsec/year

Alternative designations of Unukalhai

α Serpentis
(alpha Serpentis)
24 Serpentis
Gl 596.2

Visibility of Unukalhai from your location

Today's Unukalhai - α Serpentis (alpha Serpentis) rise, transit and set times from Greenwich, United Kingdom are the following (all times relative to the local timezone Europe/London):

Azimuth: 83.6°
Max altitude: 44.9°
Azimuth: 276.4°