18 Scorpii

Below the horizon. Rise: 19:54 | Tran: 1:13 | Set: 6:28

Alt: -1.83° Az: 258.73° Direction: West-South-West

18 Scorpii is a variable and double main-sequence star of spectral class G2 in the constellation of Scorpius.

18 Scorpii visual magnitude is 5.5. Because of its faintness, 18 Scorpii is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

DSS2 image of 18 Scorpii. The red arrow shows the motion of 18 Scorpii during the next 1000 years (3.90 arcmin in Right Ascension and -8.35 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 16h 16m 59s

Declination -08° 25’ 52”

Hour Angle 05h 29m 06s

Sidereal Time 21h 46m 05s

J2000

Right Ascension 16h 15m 37s

Declination -08° 22’ 09”

Galactic Coordinates

Galactic Longitude 4.7°

Galactic Latitude 29.16°

Finder Chart

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Finder chart for 18 Scorpii.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.5

Class Main-sequence

Absolute magnitude 4.77

Spectral Type G2V

Color Index (B-V) 0.65

Temperature 5778K

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

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

Star System Properties

18 Scorpii 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 18 Scorpii double sysyem:

Main star magnitude 5.5

Secondary star magnitude 13.2

Magnitude difference 7.7

Separation 25.8 arcsec

Distance, Radial Speed, Proper Motion

18 Scorpii is distant 45.72 light years from the Sun and it is moving far from the Sun at the speed of 11 kilometers per second.

Distance (parsec) 14.03

Distance (light year) 45.72

Radial Speed 11 km/s

Proper Motion RA 0.234 arcsec/y

Proper Motion Dec -0.501"/y

Alternative Designations

Flamsteed designation 18 Scorpii

Henry Draper Catalogue HD146233

SAO Catalogue SAO141066

Hipparcos Catalogue HIP79672

Durchmusterung Catalogue BD-07 4242

Gliese Catalogue Gl 616

General Catalogue of Variable Stars 7577

Visibility from Your Location

Today's 18 Scorpii rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 98.4° RISE 19:54

Max altitude: 30.1° TRANSIT 1:13

Azimuth: 261.6° SET 6:28

Set Location

Other stars in Scorpius