18 Aquarii

Below the horizon. Rise: 18:07 | Tran: 22:59 | Set: 3:56

Alt: -13.24° Az: 93.96° Direction: East

18 Aquarii is a variable and double main-sequence star of spectral class F1 in the constellation of Aquarius.

18 Aquarii visual magnitude is 5.49. Because of its faintness, 18 Aquarii 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 Aquarii. The red arrow shows the motion of 18 Aquarii during the next 1000 years (1.52 arcmin in Right Ascension and 0.13 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 21h 25m 32s

Declination -12° 46’ 15”

Hour Angle 17h 38m 48s

Sideral Time 15h 04m 20s

J2000

Right Ascension 21h 24m 11s

Declination -12° 52’ 41”

Galactic Coordinates

Galactic Longitude 38.63°

Galactic Latitude -39.64°

Finder Chart

Simplified finder chart for 18 Aquarii.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.49

Class Main-sequence

Absolute magnitude 2.08

Spectral Type F1V

Color Index (B-V) 0.29

Temperature 7526K

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

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

Star System Properties

18 Aquarii 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 Aquarii double sysyem:

Main star magnitude 5.49

Secondary star magnitude 12.99

Magnitude difference 7.5

Separation 48.9 arcsec

Distance, Radial Speed, Proper Motion

18 Aquarii is distant 156.73 light years from the Sun and it is moving far from the Sun at the speed of 8 kilometers per second.

Distance (parsec) 48.08

Distance (light year) 156.73

Radial Speed 8 km/s

Proper Motion RA 0.091 arcsec/y

Proper Motion Dec 0.008"/y

Alternative Designations

Flamsteed designation 18 Aquarii

Henry Draper Catalogue HD203705

SAO Catalogue SAO164364

Hipparcos Catalogue HIP105668

Durchmusterung Catalogue BD-13 5923

FK5 Catalogue 1562

General Catalogue of Variable Stars 13684

Visibility from Your Location

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

Azimuth: 102.8° RISE 18:07

Max altitude: 25.7° TRANSIT 22:59

Azimuth: 257.2° SET 3:56

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

Location

Other stars in Aquarius