Grumium - ξ Draconis (xi Draconis)

Grumium, also designated as ξ Draconis (xi Draconis), is a double giant star in the constellation of Draco.

Grumium visual magnitude is 3.75. Because of its moderate brightness, Grumium 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 Grumium:

Color of Grumium ⬤

Magnitude of Grumium 3.75

Class Giant

VISIBILITY RIGHT NOW Grumium - ξ Draconis (xi Draconis) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 25°.

Celestial coordinates and finder chart of Grumium

Grumium 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 Grumium are provided in the following table:

Right Ascension J2000 17h 53m 31s

Declination J2000 +56° 52’ 22”

Galactic Longitude 85.17°

Galactic Latitude 30.23°

Constellation Draco

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

Finder chart Grumium - ξ Draconis (xi Draconis) star

Simplified finder chart for Grumium - ξ Draconis (xi Draconis).

Visibility of Grumium from your location

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

Grumium - ξ Draconis (xi Draconis) is circumpolar and transits at 05:16 UTC (altitude: 84.6°)

Digitized Sky Survey image of Grumium

The image below is a photograph of Grumium 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 Grumium is 0.094 arcsec per year in Right Ascension and 0.08 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Grumium - ξ Draconis (xi Draconis) star

DSS2 image of Grumium. The red arrow shows the motion of Grumium during the next 1000 years (1.57 arcmin in Right Ascension and 1.33 arcmin in declination);

Distance of Grumium from the Sun and relative movement

Grumium is distant 111.41 light years from the Sun and it is moving towards the Sun at the speed of 26 kilometers per second.

Distance (parsec) 34.18 pc

Distance (light year) 111.41 ly

Heliocentric radial velocity -26 km/s

Proper Motion RA 0.094 arcsec/year

Proper Motion Dec 0.08 arcsec/year

Spectral properties of Grumium

Grumium belongs to spectral class K2 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude 1.08

Spectral Type K2III

Color Index (B-V) 1.18

Temperature of Grumium 4348K

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

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

Grumium star system properties

Grumium is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the Grumium double sysyem:

Main star magnitude 3.75

Secondary star magnitude 14.85

Magnitude difference 11.1

Separation 316 arcsec

Alternative designations of Grumium

Proper Name Grumium

Bayer designation ξ Draconis
(xi Draconis)

Flamsteed designation 32 Draconis

Henry Draper Catalogue HD163588

SAO Catalogue SAO30631

Hipparcos Catalogue HIP87585

Durchmusterung Catalogue BD+56 2033

FK5 Catalogue 671

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