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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 7:19 
Transit: 12:14 
Sunset: 17:09
wb_twilight   (Astronomical Twilight)  
What's Visible Now • Tonight Timeline
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All Constellations » Sagittarius » 

Arkab Prior - β1 Sagittarii (beta1 Sagittarii)

Below the horizon.  Never rises today
Alt: -55.89°   Az: 261.44°   Direction: West

Arkab Prior, also designated as β1 Sagittarii (beta1 Sagittarii), is a double main-sequence star of spectral class B9 in the constellation of Sagittarius.

Arkab Prior visual magnitude is 4.01. Because of its moderate brightness, Arkab Prior is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

Image of Arkab Prior - β1 Sagittarii (beta1 Sagittarii) star
DSS2 image of Arkab Prior. The red arrow shows the motion of Arkab Prior during the next 10000 years (1.50 arcmin in Right Ascension and -3.33 arcmin in declination);

Celestial Coordinates

Apparent

19h 24m 26s
-44° 24’ 32”
08h 36m 20s
04h 00m 46s

J2000

19h 22m 38s
-44° 27’ 32”

Galactic Coordinates

353.61°
-23.93°

Finder Chart

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Finder chart for Arkab Prior - β1 Sagittarii (beta1 Sagittarii).

Magnitude, Color, Spectral Class

4.01
Main-sequence

-1.31
B9V
11573K

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

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

Star System Properties

Arkab Prior is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the Arkab Prior double sysyem:

4.01
7.31
3.3
28.3 arcsec

Distance, Radial Speed, Proper Motion

Arkab Prior is distant 378.19 light years from the Sun and it is moving towards the Sun at the speed of 11 kilometers per second.

116.01
378.19
-11 km/s
0.009 arcsec/y
-0.02"/y

Alternative Designations

Arkab Prior
β1 Sagittarii
(beta1 Sagittarii)
SAO229646
SAO229646

Visibility from Your Location

Arkab Prior - β1 Sagittarii (beta1 Sagittarii) is currently not visible from Greenwich, UK