Your guide to the Solar System and the night sky
🌎 Location: Greenwich, United Kingdom [change]


HR3939 is a giant star in the constellation of Ursa Major.

HR3939 visual magnitude is 5.48. Because of its reltive faintness, HR3939 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 HR3939:

HR3939 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 26°.

Celestial coordinates and finder chart of HR3939

HR3939 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 HR3939 are provided in the following table:

09h 59m 51s
+56° 48’ 42”
Ursa Major

The simplified sky map below shows the position of HR3939 in the sky:

Finder chart HR3939 star
Simplified finder chart for HR3939.

Visibility of HR3939 from your location

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

HR3939 is circumpolar and transits at 10:00 UTC (altitude: 84.7°)

Digitized Sky Survey image of HR3939

The image below is a photograph of HR3939 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 HR3939 is -0.029 arcsec per year in Right Ascension and -0.026 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3939 star
DSS2 image of HR3939. The red arrow shows the motion of HR3939 during the next 10000 years (-4.83 arcmin in Right Ascension and -4.33 arcmin in declination);

Distance of HR3939 from the Sun and relative movement

HR3939 is distant 510.17 light years from the Sun and it is moving towards the Sun at the speed of 13 kilometers per second.

156.49 pc
510.17 ly
-13 km/s
-0.029 arcsec/year
-0.026 arcsec/year

Spectral properties of HR3939

HR3939 belongs to spectral class K5 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR3939 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3939. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3939