Rastaban - β Draconis (beta Draconis)

Altitude: 61.5° Azimuth: 69.6° Direction: East-North-East

Rastaban, also designated as β Draconis (beta Draconis), is a multiple supergiant star in the constellation of Draco.

Rastaban visual magnitude is 2.79. Thanks to its high brightness, Rastaban is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.

The table below summarizes the key facts about Rastaban:

Color of Rastaban ⬤

Magnitude of Rastaban 2.79

Class Supergiant

VISIBILITY RIGHT NOW

Rastaban - β Draconis (beta Draconis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 61.5°
Azimuth: 69.6°
Direction: East-North-East

Celestial coordinates and finder chart of Rastaban

Rastaban 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 Rastaban are provided in the following table:

Right Ascension J2000 17h 30m 25s

Declination J2000 +52° 18’ 05”

Galactic Longitude 79.58°

Galactic Latitude 33.31°

Constellation Draco

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

Finder chart Rastaban - β Draconis (beta Draconis) star

Simplified finder chart for Rastaban - β Draconis (beta Draconis).

Visibility of Rastaban from your location

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

Rastaban - β Draconis (beta Draconis) is circumpolar and transits at 16:37 UTC (altitude: 89.2°)

Digitized Sky Survey image of Rastaban

The image below is a photograph of Rastaban 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 Rastaban is -0.016 arcsec per year in Right Ascension and 0.015 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of Rastaban - β Draconis (beta Draconis) star

DSS2 image of Rastaban. The red arrow shows the motion of Rastaban during the next 10000 years (-2.67 arcmin in Right Ascension and 2.50 arcmin in declination);

Distance of Rastaban from the Sun and relative movement

Rastaban is distant 361.42 light years from the Sun and it is moving towards the Sun at the speed of 20 kilometers per second.

Distance (parsec) 110.86 pc

Distance (light year) 361.42 ly

Heliocentric radial velocity -20 km/s

Proper Motion RA -0.016 arcsec/year

Proper Motion Dec 0.015 arcsec/year

Spectral properties of Rastaban

Rastaban belongs to spectral class G2 and has a luminosity class of I corresponding to a supergiant star.

Absolute magnitude -2.43

Spectral Type G2I

Color Index (B-V) 0.98

Temperature of Rastaban 4791K

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

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

Rastaban star system properties

Rastaban 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 Rastaban double sysyem:

Main star magnitude 2.79

Secondary star magnitude 11.69

Magnitude difference 8.9

Separation 4.2 arcsec

Alternative designations of Rastaban

Proper Name Rastaban

Bayer designation β Draconis
(beta Draconis)

Flamsteed designation 23 Draconis

Henry Draper Catalogue HD159181

SAO Catalogue SAO30429

Hipparcos Catalogue HIP85670

Durchmusterung Catalogue BD+52 2065

FK5 Catalogue 653

Aitken Double Star Catalogue ADS10611

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