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public LocationGreenwich, UK
Sunrise: 4:43 
Transit: 13:01 
Sunset: 21:18
sunny   (Daytime)   What's Visible Now?
All Constellations » Gemini » 

30 Geminorum

Above the horizon.  Rise: 6:21 | Tran: 13:27 | Set: 20:33
Altitude: 10.4°   Azimuth: 81.8°   Direction: East

30 Geminorum is a double hypergiant star of spectral class K0 in the constellation of Gemini.

30 Geminorum visual magnitude is 4.49. Because of its moderate brightness, 30 Geminorum is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

Celestial coordinates and finder chart of 30 Geminorum

Finder chart 30 Geminorum star
Simplified finder chart for 30 Geminorum.

30 Geminorum 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 30 Geminorum are provided in the following table:

06h 43m 59s
+13° 13’ 40”
Image of 30 Geminorum star
DSS2 image of 30 Geminorum. The red arrow shows the motion of 30 Geminorum during the next 10000 years (-0.50 arcmin in Right Ascension and -9.67 arcmin in declination);

Key facts about 30 Geminorum


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


The red dot in the diagram below shows where 30 Geminorum is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 30 Geminorum. Attribution: Richard Powell / CC BY-SA

30 Geminorum star system properties

30 Geminorum 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 30 Geminorum double sysyem:

27.2 arcsec

Distance of 30 Geminorum from the Sun and relative movement

30 Geminorum is distant 275.80 light years from the Sun and it is moving far from the Sun at the speed of 14 kilometers per second.

84.60 pc
275.80 ly
14 km/s
-0.003 arcsec/year
-0.058 arcsec/year

Alternative designations of 30 Geminorum

30 Geminorum

Visibility of 30 Geminorum from your location

Today's 30 Geminorum rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 76.8°
Max altitude: 51.7°
Azimuth: 283.2°