18 Ursae Majoris

Above the horizon. Circumpolar today

Alt: 58.89° Az: 295.46° Direction: West-North-West

18 Ursae Majoris is a variable main-sequence star of spectral class A5 in the constellation of Ursa Major.

18 Ursae Majoris visual magnitude is 4.83. Because of its moderate brightness, 18 Ursae Majoris is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

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);

Celestial Coordinates

Apparent

Right Ascension 09h 17m 56s

Declination +53° 55’ 03”

Hour Angle 03h 29m 33s

Sideral Time 12h 47m 30s

J2000

Right Ascension 09h 16m 11s

Declination +54° 01’ 18”

Galactic Coordinates

Galactic Longitude 163.08°

Galactic Latitude 42.66°

Finder Chart

Simplified finder chart for 18 Ursae Majoris.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.83

Class Main-sequence

Absolute magnitude 2.03

Spectral Type A5V

Color Index (B-V) 0.19

Temperature 8241K

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

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

Distance, Radial Speed, Proper Motion

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.

Distance (parsec) 36.30

Distance (light year) 118.33

Radial Speed -19 km/s

Proper Motion RA 0.049 arcsec/y

Proper Motion Dec 0.061"/y

Alternative Designations

Flamsteed designation 18 Ursae Majoris

Henry Draper Catalogue HD79439

SAO Catalogue SAO27191

Hipparcos Catalogue HIP45493

Durchmusterung Catalogue BD+54 1285

Gliese Catalogue NN 3541

FK5 Catalogue 2734

General Catalogue of Variable Stars DD UMa

Visibility from Your Location

18 Ursae Majoris is circumpolar and transits at 09:42 UTC (altitude: 87.6°)

Name:	Greenwich, UK
Latitude:	51° 28' 48.0" N
Longitude:	0° 0' 0.0" E
Timezone:	Europe/London

Location

Other stars in Ursa Major