HR4581

Above the horizon. Rise: 11:29 | Tran: 21:05 | Set: 6:45

Alt: 9.57° Az: 312.51° Direction: North-West

HR4581 is a double giant star of spectral class K1 in the constellation of Ursa Major.

HR4581 visual magnitude is 5.96. Because of its faintness, HR4581 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 HR4581. The red arrow shows the motion of HR4581 during the next 100000 years (6.67 arcmin in Right Ascension and 5.00 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 12h 00m 35s

Declination +33° 01’ 34”

Hour Angle 07h 59m 32s

Sidereal Time 20h 00m 07s

J2000

Right Ascension 11h 59m 17s

Declination +33° 10’ 02”

Galactic Coordinates

Galactic Longitude 181.58°

Galactic Latitude 77.23°

Finder Chart

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Finder chart for HR4581.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.96

Class Giant

Absolute magnitude -0.61

Spectral Type K1III

Color Index (B-V) 1.15

Temperature 4409K

The red dot in the diagram below shows where HR4581 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR4581. Attribution: Richard Powell / CC BY-SA

Star System Properties

HR4581 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 HR4581 double sysyem:

Main star magnitude 5.96

Secondary star magnitude 11.96

Magnitude difference 6

Separation 4.5 arcsec

Distance, Radial Speed, Proper Motion

HR4581 is distant 670.78 light years from the Sun and it is moving towards the Sun at the speed of 1 kilometers per second.

Distance (parsec) 205.76

Distance (light year) 670.78

Radial Speed -1 km/s

Proper Motion RA 0.004 arcsec/y

Proper Motion Dec 0.003"/y

Alternative Designations

Henry Draper Catalogue HD104075

SAO Catalogue SAO62784

Hipparcos Catalogue HIP58460

Durchmusterung Catalogue BD+33 2176

Aitken Double Star Catalogue ADS8374

Visibility from Your Location

Today's HR4581 rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 57.0° RISE 11:29

Max altitude: 71.5° TRANSIT 21:05

Azimuth: 303.0° SET 6:45

Set Location

Other stars in Ursa Major