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: 6:47  
clear_day Transit: 12:50  
SunsetSet: 18:52 south
sunny DaytimeWhat's Visible Now
All Constellations » Ursa Major » 


Altitude: 41.6°   Azimuth: 325.1°   Direction: North-West

HR4391 is a main-sequence star in the constellation of Ursa Major.

HR4391 visual magnitude is 6.02. Because of its reltive faintness, HR4391 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 HR4391:


HR4391 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 41.6°
Azimuth: 325.1°
Direction: North-West

Celestial coordinates and finder chart of HR4391

HR4391 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 HR4391 are provided in the following table:

11h 22m 51s
+64° 19’ 50”
Ursa Major

The simplified sky map below shows the position of HR4391 in the sky:

Finder chart HR4391 star
Simplified finder chart for HR4391.

Visibility of HR4391 from your location

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

HR4391 is circumpolar and transits at 11:10 UTC (altitude: 77.1°)

Digitized Sky Survey image of HR4391

The image below is a photograph of HR4391 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 HR4391 is -0.005 arcsec per year in Right Ascension and 0.034 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4391 star
DSS2 image of HR4391. The red arrow shows the motion of HR4391 during the next 10000 years (-0.83 arcmin in Right Ascension and 5.67 arcmin in declination);

Distance of HR4391 from the Sun and relative movement

HR4391 is distant 281.52 light years from the Sun and it is moving far from the Sun at the speed of 1 kilometers per second.

86.36 pc
281.52 ly
1 km/s
-0.005 arcsec/year
0.034 arcsec/year

Spectral properties of HR4391

HR4391 belongs to spectral class A1 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR4391 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4391. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4391