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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: 7:44  
clear_day Transit: 11:48  
SunsetSet: 15:51 south
wb_twilight Astronomical TwilightWhat's Visible Now?
All Constellations » Gemini » 

1 Geminorum

Altitude: 2.8°   Azimuth: 55.0°   Direction: North-East

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

1 Geminorum visual magnitude is 4.16. Because of its moderate brightness, 1 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 1 Geminorum:


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

Altitude: 2.8°
Azimuth: 55.0°
Direction: North-East

Celestial coordinates and finder chart of 1 Geminorum

1 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 1 Geminorum are provided in the following table:

06h 04m 07s
+23° 15’ 47”

The simplified sky map below shows the position of 1 Geminorum in the sky:

Finder chart 1 Geminorum star
Simplified finder chart for 1 Geminorum.

Visibility of 1 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 1 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: 66.7°
Max altitude: 61.8°
Azimuth: 293.3°

Digitized Sky Survey image of 1 Geminorum

The image below is a photograph of 1 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 1 Geminorum is -0.008 arcsec per year in Right Ascension and -0.1 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 1 Geminorum star
DSS2 image of 1 Geminorum. The red arrow shows the motion of 1 Geminorum during the next 1000 years (-0.13 arcmin in Right Ascension and -1.67 arcmin in declination);

Distance of 1 Geminorum from the Sun and relative movement

1 Geminorum is distant 150.65 light years from the Sun and it is moving far from the Sun at the speed of 20 kilometers per second.

46.21 pc
150.65 ly
20 km/s
-0.008 arcsec/year
-0.1 arcsec/year

Spectral properties of 1 Geminorum

1 Geminorum belongs to spectral class G7 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 1 Geminorum is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 1 Geminorum. Attribution: Richard Powell / CC BY-SA

1 Geminorum star system properties

1 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 1 Geminorum double sysyem:

0.2 arcsec

Alternative designations of 1 Geminorum

1 Geminorum