4 Centauri

Below the horizon. Rise: 16:55 | Tran: 19:27 | Set: 21:58

Alt: -63.00° Az: 53.93° Direction: North-East

4 Centauri is a double sub-giant star of spectral class B4 in the constellation of Centaurus.

4 Centauri visual magnitude is 4.73. Because of its moderate brightness, 4 Centauri 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 4 Centauri. The red arrow shows the motion of 4 Centauri during the next 10000 years (-2.50 arcmin in Right Ascension and -2.00 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 13h 54m 41s

Declination -32° 03’ 09”

Hour Angle 13h 42m 36s

Sidereal Time 03h 37m 18s

J2000

Right Ascension 13h 53m 12s

Declination -31° 55’ 40”

Galactic Coordinates

Galactic Longitude 317.93°

Galactic Latitude 29.14°

Finder Chart

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Finder chart for 4 Centauri.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.73

Class Sub-giant

Absolute magnitude -1.83

Spectral Type B4IV

Color Index (B-V) -0.14

Temperature 12293K

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

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

Star System Properties

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

Main star magnitude 4.73

Secondary star magnitude 8.43

Magnitude difference 3.7

Separation 14.9 arcsec

Distance, Radial Speed, Proper Motion

4 Centauri is distant 669.40 light years from the Sun and it is moving far from the Sun at the speed of 5 kilometers per second.

Distance (parsec) 205.34

Distance (light year) 669.40

Radial Speed 5 km/s

Proper Motion RA -0.015 arcsec/y

Proper Motion Dec -0.012"/y

Alternative Designations

Flamsteed designation 4 Centauri

Henry Draper Catalogue HD120955

SAO Catalogue SAO204944

Hipparcos Catalogue HIP67786

Durchmusterung Catalogue CD-3110729

Visibility from Your Location

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

Azimuth: 122.1° RISE 16:55

Max altitude: 6.5° TRANSIT 19:27

Azimuth: 237.9° SET 21:58

In Evidence

Other stars in Centaurus

4 Centauri

Celestial Coordinates

Apparent

J2000

Galactic Coordinates

Finder Chart

Magnitude, Color, Spectral Class

Star System Properties

Distance, Radial Speed, Proper Motion

Alternative Designations

Visibility from Your Location

Set Location

In Evidence

Other stars in Centaurus

4 Centauri

Celestial Coordinates

Apparent

J2000

Galactic Coordinates

Finder Chart

Magnitude, Color, Spectral Class

Star System Properties

Distance, Radial Speed, Proper Motion

Alternative Designations

Visibility from Your Location