HR4800

HR4800 is a variable giant star in the constellation of Ursa Major.

HR4800 visual magnitude is 5.5. Because of its reltive faintness, HR4800 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 HR4800:

Color of HR4800 ⬤

Magnitude of HR4800 5.5

Class Giant

VISIBILITY RIGHT NOW HR4800 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 72°.

Celestial coordinates and finder chart of HR4800

HR4800 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 HR4800 are provided in the following table:

Right Ascension J2000 12h 36m 23s

Declination J2000 +59° 29’ 12”

Galactic Longitude 126.49°

Galactic Latitude 57.54°

Constellation Ursa Major

The simplified sky map below shows the position of HR4800 in the sky:

Simplified finder chart for HR4800.

Visibility of HR4800 from your location

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

HR4800 is circumpolar and transits at 00:39 UTC (altitude: 82.0°)

Digitized Sky Survey image of HR4800

The image below is a photograph of HR4800 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 HR4800 is -0.025 arcsec per year in Right Ascension and -0.011 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR4800. The red arrow shows the motion of HR4800 during the next 10000 years (-4.17 arcmin in Right Ascension and -1.83 arcmin in declination);

Distance of HR4800 from the Sun and relative movement

HR4800 is distant 32,600,000.00 light years from the Sun and it is moving towards the Sun at the speed of 91 kilometers per second.

Distance (parsec) 10,000,000.00 pc

Distance (light year) 32,600,000.00 ly

Heliocentric radial velocity -91 km/s

Proper Motion RA -0.025 arcsec/year

Proper Motion Dec -0.011 arcsec/year

Spectral properties of HR4800

HR4800 belongs to spectral class M4 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -24.50

Spectral Type M4III

Color Index (B-V)

Temperature of HR4800 10125K

The red dot in the diagram below shows where HR4800 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR4800. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4800

Henry Draper Catalogue HD109729

SAO Catalogue SAO28444

Hipparcos Catalogue HIP61532

Durchmusterung Catalogue BD+60 1406

General Catalogue of Variable Stars T UMa

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In Evidence

Other stars in Ursa Major