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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: 7:49  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
sunny DaytimeWhat's Visible Now?
All Constellations » Gemini » 

40 Geminorum

Altitude: 7.2°   Azimuth: 303.3°   Direction: West-North-West

40 Geminorum is a giant star in the constellation of Gemini.

40 Geminorum visual magnitude is 6.4. Because of its reltive faintness, 40 Geminorum should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about 40 Geminorum:


40 Geminorum is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 7.2°
Azimuth: 303.3°
Direction: West-North-West

Celestial coordinates and finder chart of 40 Geminorum

40 Geminorum is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 40 Geminorum are provided in the following table:

06h 59m 27s
+25° 54’ 51”

The simplified sky map below shows the position of 40 Geminorum in the sky:

Finder chart 40 Geminorum star
Simplified finder chart for 40 Geminorum.

Visibility of 40 Geminorum 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 40 Geminorum 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: 64.1°
Max altitude: 64.4°
Azimuth: 295.9°

Digitized Sky Survey image of 40 Geminorum

The image below is a photograph of 40 Geminorum 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 40 Geminorum is -0.011 arcsec per year in Right Ascension and -0.008 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 40 Geminorum star
DSS2 image of 40 Geminorum. The red arrow shows the motion of 40 Geminorum during the next 10000 years (-1.83 arcmin in Right Ascension and -1.33 arcmin in declination);

Distance of 40 Geminorum from the Sun and relative movement

40 Geminorum is distant 1,198.53 light years from the Sun and it is moving far from the Sun at the speed of 12 kilometers per second.

367.65 pc
1,198.53 ly
12 km/s
-0.011 arcsec/year
-0.008 arcsec/year

Spectral properties of 40 Geminorum

40 Geminorum belongs to spectral class B8 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 40 Geminorum is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 40 Geminorum. Attribution: Richard Powell / CC BY-SA

Alternative designations of 40 Geminorum

40 Geminorum