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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: 7:49  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
sunny DaytimeWhat's Visible Now?
All Constellations » Ursa Major » 


Altitude: 51.7°   Azimuth: 265.8°   Direction: West

HR4345 is a multiple hypergiant star in the constellation of Ursa Major.

HR4345 visual magnitude is 6.41. Because of its reltive faintness, HR4345 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 HR4345:


HR4345 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 51.7°
Azimuth: 265.8°
Direction: West

Celestial coordinates and finder chart of HR4345

HR4345 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 HR4345 are provided in the following table:

11h 12m 32s
+35° 48’ 48”
Ursa Major

The simplified sky map below shows the position of HR4345 in the sky:

Finder chart HR4345 star
Simplified finder chart for HR4345.

Visibility of HR4345 from your location

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

Today's HR4345 rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 54.2°
Max altitude: 74.3°
Azimuth: 305.8°

Digitized Sky Survey image of HR4345

The image below is a photograph of HR4345 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 HR4345 is -0.271 arcsec per year in Right Ascension and -0.17 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR4345 star
DSS2 image of HR4345. The red arrow shows the motion of HR4345 during the next 1000 years (-4.52 arcmin in Right Ascension and -2.83 arcmin in declination);

Distance of HR4345 from the Sun and relative movement

HR4345 is distant 70.81 light years from the Sun and it is moving towards the Sun at the speed of 3 kilometers per second.

21.72 pc
70.81 ly
-3 km/s
-0.271 arcsec/year
-0.17 arcsec/year

Spectral properties of HR4345

HR4345 belongs to spectral class G0 and has a luminosity class of V corresponding to a hypergiant star.


The red dot in the diagram below shows where HR4345 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4345. Attribution: Richard Powell / CC BY-SA

HR4345 star system properties

HR4345 is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the HR4345 double sysyem:

138.7 arcsec

Alternative designations of HR4345