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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
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All Constellations » Ursa Major » 

18 Ursae Majoris

Altitude: 24.4°   Azimuth: 31.0°   Direction: North-North-East

18 Ursae Majoris is a variable main-sequence star in the constellation of Ursa Major.

18 Ursae Majoris visual magnitude is 4.83. Because of its moderate brightness, 18 Ursae Majoris 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 18 Ursae Majoris:


18 Ursae Majoris is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 24.4°
Azimuth: 31.0°
Direction: North-North-East

Celestial coordinates and finder chart of 18 Ursae Majoris

18 Ursae Majoris 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 18 Ursae Majoris are provided in the following table:

09h 16m 11s
+54° 01’ 18”
Ursa Major

The simplified sky map below shows the position of 18 Ursae Majoris in the sky:

Finder chart 18 Ursae Majoris star
Simplified finder chart for 18 Ursae Majoris.

Visibility of 18 Ursae Majoris from your location

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

18 Ursae Majoris is circumpolar and transits at 04:29 UTC (altitude: 87.5°)

Digitized Sky Survey image of 18 Ursae Majoris

The image below is a photograph of 18 Ursae Majoris 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 18 Ursae Majoris is 0.049 arcsec per year in Right Ascension and 0.061 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 18 Ursae Majoris star
DSS2 image of 18 Ursae Majoris. The red arrow shows the motion of 18 Ursae Majoris during the next 10000 years (8.17 arcmin in Right Ascension and 10.17 arcmin in declination);

Distance of 18 Ursae Majoris from the Sun and relative movement

18 Ursae Majoris is distant 118.33 light years from the Sun and it is moving towards the Sun at the speed of 19 kilometers per second.

36.30 pc
118.33 ly
-19 km/s
0.049 arcsec/year
0.061 arcsec/year

Spectral properties of 18 Ursae Majoris

18 Ursae Majoris belongs to spectral class A5 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where 18 Ursae Majoris is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 18 Ursae Majoris. Attribution: Richard Powell / CC BY-SA

Alternative designations of 18 Ursae Majoris

18 Ursae Majoris