HR4481

Altitude: 32.5° Azimuth: 336.3° Direction: North-North-West

HR4481 is a double sub-giant star in the constellation of Ursa Major.

HR4481 visual magnitude is 6.46. Because of its reltive faintness, HR4481 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 HR4481:

Color of HR4481 ⬤

Magnitude of HR4481 6.46

Class Sub-giant

VISIBILITY RIGHT NOW

HR4481 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 32.5°
Azimuth: 336.3°
Direction: North-North-West

Celestial coordinates and finder chart of HR4481

HR4481 is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR4481 are provided in the following table:

Right Ascension J2000 11h 38m 49s

Declination J2000 +64° 20’ 48”

Galactic Longitude 135.31°

Galactic Latitude 51°

Constellation Ursa Major

The simplified sky map below shows the position of HR4481 in the sky:

Simplified finder chart for HR4481.

Visibility of HR4481 from your location

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

HR4481 is circumpolar and transits at 11:26 UTC (altitude: 77.1°)

Digitized Sky Survey image of HR4481

The image below is a photograph of HR4481 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 HR4481 is 0.016 arcsec per year in Right Ascension and 0.006 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR4481. The red arrow shows the motion of HR4481 during the next 10000 years (2.67 arcmin in Right Ascension and 1.00 arcmin in declination);

Distance of HR4481 from the Sun and relative movement

HR4481 is distant 640.47 light years from the Sun and it is moving towards the Sun at the speed of 22 kilometers per second.

Distance (parsec) 196.46 pc

Distance (light year) 640.47 ly

Heliocentric radial velocity -22 km/s

Proper Motion RA 0.016 arcsec/year

Proper Motion Dec 0.006 arcsec/year

Spectral properties of HR4481

HR4481 belongs to spectral class A5 and has a luminosity class of IV corresponding to a sub-giant star.

Absolute magnitude -0.01

Spectral Type A5IV

Color Index (B-V)

Temperature of HR4481 10125K

The red dot in the diagram below shows where HR4481 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR4481. Attribution: Richard Powell / CC BY-SA

HR4481 star system properties

HR4481 is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the HR4481 double sysyem:

Main star magnitude 6.46

Secondary star magnitude 7.76

Magnitude difference 1.3

Separation 1.8 arcsec

Alternative designations of HR4481

Henry Draper Catalogue HD101150

SAO Catalogue SAO15580

Hipparcos Catalogue HIP56816

Durchmusterung Catalogue BD+65 843

Aitken Double Star Catalogue ADS8249

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In Evidence

Other stars in Ursa Major