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public LocationGreenwich, United Kingdom
Sunrise: 4:42 
Transit: 12:58 
Sunset: 21:15
sunny   (Daytime)   What's Visible Now?


Above the horizon.  Circumpolar today
Altitude: 48.7°   Azimuth: 26.4°   Direction: North-North-East

HR3645 is a hypergiant star of spectral class F0 in the constellation of Ursa Major.

HR3645 visual magnitude is 5.96. Because of its faintness, HR3645 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 HR3645

Finder chart HR3645 star
Simplified finder chart for HR3645.

HR3645 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 HR3645 are provided in the following table:

09h 15m 52s
+72° 56’ 45”
Ursa Major
Image of HR3645 star
DSS2 image of HR3645. The red arrow shows the motion of HR3645 during the next 10000 years (-14.17 arcmin in Right Ascension and -10.50 arcmin in declination);

Key facts about HR3645


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


The red dot in the diagram below shows where HR3645 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3645. Attribution: Richard Powell / CC BY-SA

Distance of HR3645 from the Sun and relative movement

HR3645 is distant 290.81 light years from the Sun

89.21 pc
290.81 ly
-0.085 arcsec/year
-0.063 arcsec/year

Alternative designations of HR3645


Visibility of HR3645 from your location

HR3645 is circumpolar and transits at 15:46 UTC (altitude: 68.5°)