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public LocationGreenwich, United Kingdom
Sunrise: 4:42 
Transit: 13:00 
Sunset: 21:17
sunny   (Daytime)   What's Visible Now?


Above the horizon.  Circumpolar today
Altitude: 18.8°   Azimuth: 4.3°   Direction: North

HR3870 is a variable giant star of spectral class M3 in the constellation of Ursa Major.

HR3870 visual magnitude is 5.2. Because of its faintness, HR3870 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.

Celestial coordinates and finder chart of HR3870

Finder chart HR3870 star
Simplified finder chart for HR3870.

HR3870 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 HR3870 are provided in the following table:

09h 46m 31s
+57° 07’ 41”
Ursa Major
Image of HR3870 star
DSS2 image of HR3870. The red arrow shows the motion of HR3870 during the next 10000 years (0.67 arcmin in Right Ascension and 5.67 arcmin in declination);

Key facts about HR3870


and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR3870 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3870. Attribution: Richard Powell / CC BY-SA

Distance of HR3870 from the Sun and relative movement

HR3870 is distant 556.31 light years from the Sun and it is moving far from the Sun at the speed of 8 kilometers per second.

170.65 pc
556.31 ly
8 km/s
0.004 arcsec/year
0.034 arcsec/year

Alternative designations of HR3870


Visibility of HR3870 from your location

HR3870 is circumpolar and transits at 15:53 UTC (altitude: 84.4°)