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public LocationGreenwich, UK
Sunrise: 5:01 
Transit: 13:04 
Sunset: 21:06
sunny   (Daytime)   What's Visible Now?
All Constellations » Gemini » 

σ Geminorum (sigma Geminorum)

Above the horizon.  Rise: 4:13 | Tran: 13:05 | Set: 21:57
Alt: 19.89°   Az: 68.37°   Direction: East-North-East

σ Geminorum is a variable and double giant star of spectral class K1 in the constellation of Gemini.

σ Geminorum visual magnitude is 4.28. Because of its moderate brightness, σ 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.

σ Geminorum is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere.

Image of σ Geminorum (sigma Geminorum) star
DSS2 image of σ Geminorum. The red arrow shows the motion of σ Geminorum during the next 1000 years (1.08 arcmin in Right Ascension and -3.87 arcmin in declination);

Celestial Coordinates


07h 44m 50s
+28° 49’ 25”
17h 44m 29s
01h 29m 19s


07h 43m 18s
+28° 53’ 00”

Galactic Coordinates


Finder Chart

Finder chart σ Geminorum (sigma Geminorum) star
Simplified finder chart for σ Geminorum (sigma Geminorum).

Magnitude, Color, Spectral Class



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

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

Star System Properties

σ 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 σ Geminorum double sysyem:

182.2 arcsec

Distance, Radial Speed, Proper Motion

σ Geminorum is distant 122.19 light years from the Sun and it is moving far from the Sun at the speed of 46 kilometers per second.

37.48 pc
122.19 ly
46 km/s
0.065 arcsec/y
-0.232 "/y

Alternative Designations

σ Geminorum
(sigma Geminorum)
75 Geminorum

Visibility from Your Location

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

Azimuth: 61.2°
Max altitude: 67.3°
Azimuth: 298.8°