18 Ursae Majoris

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:

Color of 18 Ursae Majoris ⬤

Magnitude of 18 Ursae Majoris 4.83

Class Main-sequence

VISIBILITY RIGHT NOW 18 Ursae Majoris is above the horizon from Greenwich, United Kingdom [change]. Altitude: 16°.

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:

Right Ascension J2000 09h 16m 11s

Declination J2000 +54° 01’ 18”

Galactic Longitude 163.08°

Galactic Latitude 42.66°

Constellation Ursa Major

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

Simplified finder chart for 18 Ursae Majoris.

Visibility of 18 Ursae Majoris from your location

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

18 Ursae Majoris is circumpolar and transits at 20:32 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.

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.

Distance (parsec) 36.30 pc

Distance (light year) 118.33 ly

Heliocentric radial velocity -19 km/s

Proper Motion RA 0.049 arcsec/year

Proper Motion Dec 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.

Absolute magnitude 2.03

Spectral Type A5V

Color Index (B-V) 0.19

Temperature of 18 Ursae Majoris 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

Alternative designations of 18 Ursae Majoris

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

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Other stars in Ursa Major