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public LocationGreenwich, UK
TimezoneEurope/London
Sunrise: 5:10 
Transit: 13:06 
Sunset: 21:02
sunny   (Daytime)   What's Visible Now?
All Constellations » Ursa Major » 

HR4840

Above the horizon.  Circumpolar today
Alt: 68.08°   Az: 309.85°   Direction: North-West

HR4840 is a variable hypergiant star of spectral class K0 in the constellation of Ursa Major.

HR4840 visual magnitude is 6.38. Because of its faintness, HR4840 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.

Image of HR4840 star
DSS2 image of HR4840. The red arrow shows the motion of HR4840 during the next 10000 years (-7.83 arcmin in Right Ascension and 4.33 arcmin in declination);

Celestial Coordinates

Apparent

12h 44m 08s
+61° 01’ 16”
02h 25m 06s
15h 09m 14s

J2000

12h 43m 04s
+61° 09’ 20”

Galactic Coordinates

124.73°
55.94°

Finder Chart

Finder chart HR4840 star
Simplified finder chart for HR4840.

Magnitude, Color, Spectral Class

6.38
Hypergiant

0.55
K0
4194K

The red dot in the diagram below shows where HR4840 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4840. Attribution: Richard Powell / CC BY-SA

Distance, Radial Speed, Proper Motion

HR4840 is distant 477.31 light years from the Sun and it is moving towards the Sun at the speed of 6 kilometers per second.

146.41
477.31
-6 km/s
-0.047 arcsec/y
0.026"/y

Alternative Designations

SAO15877
SAO15877

Visibility from Your Location

HR4840 is circumpolar and transits at 16:44 UTC (altitude: 80.5°)