Your guide to the Solar System and the night sky
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🌎  Observing from: Greenwich, United Kingdom [change]
🌅 Sunrise: 5:54  ☀️ Transit: 12:05  🌅 Sunset: 18:16


HR4103 is a hypergiant star in the constellation of Ursa Major.

HR4103 visual magnitude is 6.35. Because of its reltive faintness, HR4103 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 HR4103:

HR4103 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 59°.

Celestial coordinates and finder chart of HR4103

HR4103 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 HR4103 are provided in the following table:

10h 28m 36s
+45° 12’ 43”
Ursa Major

The simplified sky map below shows the position of HR4103 in the sky:

Finder chart HR4103 star
Simplified finder chart for HR4103.

Visibility of HR4103 from your location

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

HR4103 is circumpolar and transits at 22:20 UTC (altitude: 83.7°)

Digitized Sky Survey image of HR4103

The image below is a photograph of HR4103 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 HR4103 is -0.021 arcsec per year in Right Ascension and -0.019 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4103 star
DSS2 image of HR4103. The red arrow shows the motion of HR4103 during the next 10000 years (-3.50 arcmin in Right Ascension and -3.17 arcmin in declination);

Distance of HR4103 from the Sun and relative movement

HR4103 is distant 763.47 light years from the Sun and it is moving towards the Sun at the speed of 4 kilometers per second.

234.19 pc
763.47 ly
-4 km/s
-0.021 arcsec/year
-0.019 arcsec/year

Spectral properties of HR4103

HR4103 belongs to spectral class K0


The red dot in the diagram below shows where HR4103 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4103. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4103