Your guide to the Solar System and the night sky
🌎 Location: Greenwich, United Kingdom [change]

Rukbat - α Sagittarii (alpha Sagittarii)

Rukbat, also designated as α Sagittarii (alpha Sagittarii), is a main-sequence star in the constellation of Sagittarius.

Rukbat visual magnitude is 3.97. Because of its moderate brightness, Rukbat 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 Rukbat:

3.97
Main-sequence
Rukbat - α Sagittarii (alpha Sagittarii) is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of Rukbat

Rukbat is situated south of the celestial equator, as such, it is more easily visible from the southern emisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Rukbat are provided in the following table:

19h 23m 53s
-40° 36’ 57”
357.71°
-23.09°
Sagittarius

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

Finder chart Rukbat - α Sagittarii (alpha Sagittarii) star
Simplified finder chart for Rukbat - α Sagittarii (alpha Sagittarii).

Visibility of Rukbat from your location

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

Rukbat - α Sagittarii (alpha Sagittarii) is currently not visible from Greenwich, United Kingdom [change]

Digitized Sky Survey image of Rukbat

The image below is a photograph of Rukbat 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 Rukbat is 0.03 arcsec per year in Right Ascension and -0.123 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Rukbat - α Sagittarii (alpha Sagittarii) star
DSS2 image of Rukbat. The red arrow shows the motion of Rukbat during the next 1000 years (0.50 arcmin in Right Ascension and -2.05 arcmin in declination);

Distance of Rukbat from the Sun and relative movement

Rukbat is distant 169.79 light years from the Sun and it is moving towards the Sun at the speed of 1 kilometers per second.

52.08 pc
169.79 ly
-1 km/s
0.03 arcsec/year
-0.123 arcsec/year

Spectral properties of Rukbat

Rukbat belongs to spectral class B8 and has a luminosity class of V corresponding to a main-sequence star.

0.39
B8V
11573K

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

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

Alternative designations of Rukbat

Rukbat
α Sagittarii
(alpha Sagittarii)
SAO229659
SAO229659