HR4581

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

HR4581 visual magnitude is 5.96. Because of its reltive faintness, HR4581 should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about HR4581:

Color of HR4581 ⬤

Magnitude of HR4581 5.96

Class Giant

VISIBILITY RIGHT NOW HR4581 is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of HR4581

HR4581 is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR4581 are provided in the following table:

Right Ascension J2000 11h 59m 17s

Declination J2000 +33° 10’ 02”

Galactic Longitude 181.58°

Galactic Latitude 77.23°

Constellation Ursa Major

The simplified sky map below shows the position of HR4581 in the sky:

Simplified finder chart for HR4581.

Visibility of HR4581 from your location

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

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

Azimuth: 56.8° RISE 14:20

Max altitude: 71.7° TRANSIT 0:02

Azimuth: 303.2° SET 9:39

RIGHT NOW HR4581 is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR4581

The image below is a photograph of HR4581 from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of HR4581 is 0.004 arcsec per year in Right Ascension and 0.003 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

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);

Distance of HR4581 from the Sun and relative movement

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 pc

Distance (light year) 670.78 ly

Heliocentric radial velocity -1 km/s

Proper Motion RA 0.004 arcsec/year

Proper Motion Dec 0.003 arcsec/year

Spectral properties of HR4581

HR4581 belongs to spectral class K1 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -0.61

Spectral Type K1III

Color Index (B-V) 1.15

Temperature of HR4581 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

HR4581 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

Alternative designations of HR4581

Henry Draper Catalogue HD104075

SAO Catalogue SAO62784

Hipparcos Catalogue HIP58460

Durchmusterung Catalogue BD+33 2176

Aitken Double Star Catalogue ADS8374

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Other stars in Ursa Major