4 Aquarii

Above the horizon. Rise: 0:18 | Tran: 5:52 | Set: 11:22

Alt: 8.05° Az: 109.50° Direction: East-South-East

4 Aquarii is a variable and multiple main-sequence star of spectral class F5 in the constellation of Aquarius.

4 Aquarii visual magnitude is 5.99. Because of its faintness, 4 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 4 Aquarii. The red arrow shows the motion of 4 Aquarii during the next 1000 years (1.65 arcmin in Right Ascension and -0.02 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 20h 52m 46s

Declination -05° 31’ 47”

Hour Angle 19h 21m 19s

Sidereal Time 16h 14m 05s

J2000

Right Ascension 20h 51m 25s

Declination -05° 37’ 35”

Galactic Coordinates

Galactic Longitude 42.13°

Galactic Latitude -29.18°

Finder Chart

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Finder chart for 4 Aquarii.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.99

Class Main-sequence

Absolute magnitude 2.14

Spectral Type F5V

Color Index (B-V) 0.46

Temperature 6576K

The red dot in the diagram below shows where 4 Aquarii is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 4 Aquarii. Attribution: Richard Powell / CC BY-SA

Star System Properties

4 Aquarii is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the 4 Aquarii double sysyem:

Main star magnitude 5.99

Secondary star magnitude 6.89

Magnitude difference 0.9

Separation 1.1 arcsec

Distance, Radial Speed, Proper Motion

4 Aquarii is distant 192.10 light years from the Sun and it is moving towards the Sun at the speed of 25 kilometers per second.

Distance (parsec) 58.93

Distance (light year) 192.10

Radial Speed -25 km/s

Proper Motion RA 0.099 arcsec/y

Proper Motion Dec -0.001"/y

Alternative Designations

Flamsteed designation 4 Aquarii

Henry Draper Catalogue HD198571

SAO Catalogue SAO144877

Hipparcos Catalogue HIP102945

Durchmusterung Catalogue BD-06 5604

General Catalogue of Variable Stars 13350

Aitken Double Star Catalogue ADS14360

Visibility from Your Location

Today's 4 Aquarii rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 95.5° RISE 0:18

Max altitude: 33.0° TRANSIT 5:52

Azimuth: 264.5° SET 11:22

Set Location

Other stars in Aquarius