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public  Greenwich, UK Greenwich, UK  ⓘ
Timezone: Europe/London
Sunrise: 5:05 
Transit: 12:56 
Sunset: 20:48
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In Evidence

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Detailed information about the discovery of Comet C/2025 J1 (Borisov) and pointers to useful resources to track and observe it. Read more...

Other stars in Ursa Major
All Constellations » Ursa Major » 

HR3939

Above the horizon.  Circumpolar today
Alt: 18.87°   Az: 351.41°   Direction: North

HR3939 is a giant star of spectral class K5 in the constellation of Ursa Major.

HR3939 visual magnitude is 5.48. Because of its faintness, HR3939 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 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);

Celestial Coordinates

Apparent

10h 01m 35s
+56° 41’ 21”
11h 00m 21s
21h 01m 57s

J2000

09h 59m 51s
+56° 48’ 42”

Galactic Coordinates

156.48°
47.6°

Finder Chart

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Finder chart for HR3939.

Magnitude, Color, Spectral Class

⬤
5.48
Giant

-0.49
K5III
1.46
3855K

The red dot in the diagram below shows where HR3939 is situated in the Hertzsprungā€“Russell diagram.

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

Distance, Radial Speed, Proper Motion

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
510.17
-13 km/s
-0.029 arcsec/y
-0.026"/y

Alternative Designations

HD86378
SAO27464
SAO27464
HIP49005
BD+57 1242
2802

Visibility from Your Location

HR3939 is circumpolar and transits at 18:14 UTC (altitude: 84.8°)