Your guide to the Solar System and the night sky
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🌎  Observing from: Greenwich, United Kingdom [change]

51 Geminorum

51 Geminorum is a variable and multiple giant star in the constellation of Gemini.

51 Geminorum visual magnitude is 5. Because of its moderate brightness, 51 Geminorum should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about 51 Geminorum:

51 Geminorum is above the horizon from Greenwich, United Kingdom [change]. Altitude: 0°.

Celestial coordinates and finder chart of 51 Geminorum

51 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 51 Geminorum are provided in the following table:

07h 13m 22s
+16° 09’ 32”

The simplified sky map below shows the position of 51 Geminorum in the sky:

Finder chart 51 Geminorum star
Simplified finder chart for 51 Geminorum.

Visibility of 51 Geminorum from your location

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's 51 Geminorum rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 73.8°
Max altitude: 54.7°
Azimuth: 286.2°
51 Geminorum is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 51 Geminorum

The image below is a photograph of 51 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 51 Geminorum is 0.013 arcsec per year in Right Ascension and -0.042 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 51 Geminorum star
DSS2 image of 51 Geminorum. The red arrow shows the motion of 51 Geminorum during the next 10000 years (2.17 arcmin in Right Ascension and -7.00 arcmin in declination);

Distance of 51 Geminorum from the Sun and relative movement

51 Geminorum is distant 699.57 light years from the Sun and it is moving towards the Sun at the speed of 9 kilometers per second.

214.59 pc
699.57 ly
-9 km/s
0.013 arcsec/year
-0.042 arcsec/year

Spectral properties of 51 Geminorum

51 Geminorum belongs to spectral class M4 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 51 Geminorum is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 51 Geminorum. Attribution: Richard Powell / CC BY-SA

51 Geminorum star system properties

51 Geminorum 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 51 Geminorum double sysyem:

149.2 arcsec

Alternative designations of 51 Geminorum

51 Geminorum