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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:37  
clear_day Transit: 11:46  
SunsetSet: 15:55 south
sunny DaytimeWhat's Visible Now?
All Constellations » Ursa Major » 


Altitude: 46.2°   Azimuth: 329.0°   Direction: North-North-West

HR4181 is a giant star in the constellation of Ursa Major.

HR4181 visual magnitude is 5. Because of its moderate brightness, HR4181 should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about HR4181:


HR4181 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 46.2°
Azimuth: 329.0°
Direction: North-North-West

Celestial coordinates and finder chart of HR4181

HR4181 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 HR4181 are provided in the following table:

10h 43m 04s
+69° 04’ 33”
Ursa Major

The simplified sky map below shows the position of HR4181 in the sky:

Finder chart HR4181 star
Simplified finder chart for HR4181.

Visibility of HR4181 from your location

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

HR4181 is circumpolar and transits at 06:15 UTC (altitude: 72.4°)

Digitized Sky Survey image of HR4181

The image below is a photograph of HR4181 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 HR4181 is 0.002 arcsec per year in Right Ascension and -0.012 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4181 star
DSS2 image of HR4181. The red arrow shows the motion of HR4181 during the next 10000 years (0.33 arcmin in Right Ascension and -2.00 arcmin in declination);

Distance of HR4181 from the Sun and relative movement

HR4181 is distant 426.14 light years from the Sun

130.72 pc
426.14 ly
0.002 arcsec/year
-0.012 arcsec/year

Spectral properties of HR4181

HR4181 belongs to spectral class K3 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR4181 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4181. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4181