Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:50  
clear_day Transit: 12:56  
SunsetSet: 21:03 south
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All Constellations » Canis Minor » 

Gomeisa - β Canis Minoris (beta Canis Minoris)

Gomeisa, also designated as β Canis Minoris (beta Canis Minoris), is a variable and multiple main-sequence star in the constellation of Canis Minor.

Gomeisa visual magnitude is 2.9. Thanks to its high brightness, Gomeisa is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.

The table below summarizes the key facts about Gomeisa:

Gomeisa - β Canis Minoris (beta Canis Minoris) is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 22°.

Celestial coordinates and finder chart of Gomeisa

Gomeisa 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 Gomeisa are provided in the following table:

07h 27m 08s
+08° 17’ 21”
Canis Minor

The simplified sky map below shows the position of Gomeisa in the sky:

Finder chart Gomeisa - β Canis Minoris (beta Canis Minoris) star
Simplified finder chart for Gomeisa - β Canis Minoris (beta Canis Minoris).

Visibility of Gomeisa 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 Gomeisa - β Canis Minoris (beta Canis Minoris) 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: 81.7°
Max altitude: 46.8°
Azimuth: 278.3°
Gomeisa - β Canis Minoris (beta Canis Minoris) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of Gomeisa

The image below is a photograph of Gomeisa 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 Gomeisa is -0.052 arcsec per year in Right Ascension and -0.038 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of Gomeisa - β Canis Minoris (beta Canis Minoris) star
DSS2 image of Gomeisa. The red arrow shows the motion of Gomeisa during the next 10000 years (-8.67 arcmin in Right Ascension and -6.33 arcmin in declination);

Distance of Gomeisa from the Sun and relative movement

Gomeisa is distant 170.15 light years from the Sun and it is moving far from the Sun at the speed of 22 kilometers per second.

52.19 pc
170.15 ly
22 km/s
-0.052 arcsec/year
-0.038 arcsec/year

Spectral properties of Gomeisa

Gomeisa belongs to spectral class B8 and has a luminosity class of V corresponding to a main-sequence star.


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

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

Gomeisa star system properties

Gomeisa 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 Gomeisa double sysyem:

138.7 arcsec

Alternative designations of Gomeisa

β Canis Minoris
(beta Canis Minoris)
3 Canis Minoris