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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: 7:37  
clear_day Transit: 11:46  
SunsetSet: 15:55 south
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All Constellations » Ursa Minor » 

Yildun - δ Ursae Minoris (delta Ursae Minoris)

Altitude: 54.6°   Azimuth: 357.6°   Direction: North

Yildun, also designated as δ Ursae Minoris (delta Ursae Minoris), is a main-sequence star in the constellation of Ursa Minor.

Yildun visual magnitude is 4.36. Because of its moderate brightness, Yildun should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about Yildun:


Yildun - δ Ursae Minoris (delta Ursae Minoris) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 54.6°
Azimuth: 357.6°
Direction: North

Celestial coordinates and finder chart of Yildun

Yildun 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 Yildun are provided in the following table:

17h 32m 12s
+86° 35’ 11”
Ursa Minor

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

Finder chart Yildun - δ Ursae Minoris (delta Ursae Minoris) star
Simplified finder chart for Yildun - δ Ursae Minoris (delta Ursae Minoris).

Visibility of Yildun from your location

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

Yildun - δ Ursae Minoris (delta Ursae Minoris) is circumpolar and transits at 13:03 UTC (altitude: 54.9°)

Digitized Sky Survey image of Yildun

The image below is a photograph of Yildun 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 Yildun is 0.009 arcsec per year in Right Ascension and 0.056 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of Yildun - δ Ursae Minoris (delta Ursae Minoris) star
DSS2 image of Yildun. The red arrow shows the motion of Yildun during the next 10000 years (1.50 arcmin in Right Ascension and 9.33 arcmin in declination);

Distance of Yildun from the Sun and relative movement

Yildun is distant 182.63 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

56.02 pc
182.63 ly
-8 km/s
0.009 arcsec/year
0.056 arcsec/year

Spectral properties of Yildun

Yildun belongs to spectral class A1 and has a luminosity class of V corresponding to a main-sequence star.


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

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

Alternative designations of Yildun

δ Ursae Minoris
(delta Ursae Minoris)
23 Ursae Minoris