HR4579

Above the horizon. Rise: 17:53 | Tran: 21:21 | Set: 0:48

Alt: 12.30° Az: 185.31° Direction: South

HR4579 is a double hypergiant star of spectral class A0 in the constellation of Hydra.

HR4579 visual magnitude is 6.43. Because of its faintness, HR4579 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 HR4579. The red arrow shows the motion of HR4579 during the next 10000 years (-4.50 arcmin in Right Ascension and -3.17 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 12h 00m 12s

Declination -26° 03’ 00”

Hour Angle 00h 23m 05s

Sidereal Time 12h 23m 18s

J2000

Right Ascension 11h 58m 54s

Declination -25° 54’ 32”

Galactic Coordinates

Galactic Longitude 288.4°

Galactic Latitude 35.48°

Finder Chart

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Finder chart for HR4579.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 6.43

Class Hypergiant

Absolute magnitude -0.75

Spectral Type A0V

Color Index (B-V) 0.03

Temperature 9766K

The red dot in the diagram below shows where HR4579 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR4579. Attribution: Richard Powell / CC BY-SA

Star System Properties

HR4579 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 HR4579 double sysyem:

Main star magnitude 6.43

Secondary star magnitude 6.63

Magnitude difference 0.2

Separation 0.2 arcsec

Distance, Radial Speed, Proper Motion

HR4579 is distant 890.71 light years from the Sun and it is moving far from the Sun at the speed of 13 kilometers per second.

Distance (parsec) 273.22

Distance (light year) 890.71

Radial Speed 13 km/s

Proper Motion RA -0.027 arcsec/y

Proper Motion Dec -0.019"/y

Alternative Designations

Henry Draper Catalogue HD104039

SAO Catalogue SAO180349

Hipparcos Catalogue HIP58436

Durchmusterung Catalogue CD-25 8963

Aitken Double Star Catalogue ADS8371

Visibility from Your Location

Today's HR4579 rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 116.1° RISE 17:53

Max altitude: 12.5° TRANSIT 21:21

Azimuth: 243.9° SET 0:48

Set Location

Other stars in Hydra