20 Draconis

20 Draconis is a variable and double main-sequence star in the constellation of Draco.

20 Draconis visual magnitude is 6.41. Because of its reltive faintness, 20 Draconis 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 20 Draconis:

Color of 20 Draconis ⬤

Magnitude of 20 Draconis 6.41

Class Main-sequence

VISIBILITY RIGHT NOW 20 Draconis is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 27°.

Celestial coordinates and finder chart of 20 Draconis

20 Draconis 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 20 Draconis are provided in the following table:

Right Ascension J2000 16h 56m 25s

Declination J2000 +65° 02’ 21”

Galactic Longitude 95.55°

Galactic Latitude 36.45°

Constellation Draco

The simplified sky map below shows the position of 20 Draconis in the sky:

Simplified finder chart for 20 Draconis.

Visibility of 20 Draconis from your location

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

20 Draconis is circumpolar and transits at 00:15 UTC (altitude: 76.4°)

Digitized Sky Survey image of 20 Draconis

The image below is a photograph of 20 Draconis 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 20 Draconis is -0.041 arcsec per year in Right Ascension and 0.032 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of 20 Draconis. The red arrow shows the motion of 20 Draconis during the next 10000 years (-6.83 arcmin in Right Ascension and 5.33 arcmin in declination);

Distance of 20 Draconis from the Sun and relative movement

20 Draconis is distant 218.79 light years from the Sun and it is moving towards the Sun at the speed of 21 kilometers per second.

Distance (parsec) 67.11 pc

Distance (light year) 218.79 ly

Heliocentric radial velocity -21 km/s

Proper Motion RA -0.041 arcsec/year

Proper Motion Dec 0.032 arcsec/year

Spectral properties of 20 Draconis

20 Draconis belongs to spectral class F1 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude 2.28

Spectral Type F1V

Color Index (B-V) 0.38

Temperature of 20 Draconis 6989K

The red dot in the diagram below shows where 20 Draconis is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 20 Draconis. Attribution: Richard Powell / CC BY-SA

20 Draconis star system properties

20 Draconis is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the 20 Draconis double sysyem:

Main star magnitude 6.41

Secondary star magnitude 6.61

Magnitude difference 0.2

Separation 1 arcsec

Alternative designations of 20 Draconis

Flamsteed designation 20 Draconis

Henry Draper Catalogue HD153697

SAO Catalogue SAO17285

Hipparcos Catalogue HIP82898

Durchmusterung Catalogue BD+65 1159

General Catalogue of Variable Stars 8081

Aitken Double Star Catalogue ADS10279

In Evidence

Other stars in Draco