Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:04  
clear_day Transit: 12:47  
SunsetSet: 18:30 south
sunny DaytimeWhat's Visible Now
All Constellations » Ursa Major » 


Altitude: 63.1°   Azimuth: 294.1°   Direction: West-North-West

HR4427 is a hypergiant star in the constellation of Ursa Major.

HR4427 visual magnitude is 6.41. Because of its reltive faintness, HR4427 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 HR4427:


HR4427 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 63.1°
Azimuth: 294.1°
Direction: West-North-West

Celestial coordinates and finder chart of HR4427

HR4427 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 HR4427 are provided in the following table:

11h 30m 12s
+54° 21’ 42”
Ursa Major

The simplified sky map below shows the position of HR4427 in the sky:

Finder chart HR4427 star
Simplified finder chart for HR4427.

Visibility of HR4427 from your location

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

HR4427 is circumpolar and transits at 10:38 UTC (altitude: 87.1°)

Digitized Sky Survey image of HR4427

The image below is a photograph of HR4427 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 HR4427 is 0.01 arcsec per year in Right Ascension and -0.057 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4427 star
DSS2 image of HR4427. The red arrow shows the motion of HR4427 during the next 10000 years (1.67 arcmin in Right Ascension and -9.50 arcmin in declination);

Distance of HR4427 from the Sun and relative movement

HR4427 is distant 641.73 light years from the Sun and it is moving towards the Sun at the speed of 22 kilometers per second.

196.85 pc
641.73 ly
-22 km/s
0.01 arcsec/year
-0.057 arcsec/year

Spectral properties of HR4427

HR4427 belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where HR4427 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4427. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4427