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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 4:46 
Transit: 12:58 
Sunset: 21:11
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All Constellations » Sagittarius » 

Arkab Posterior - β2 Sagittarii (beta2 Sagittarii)

Below the horizon.  Never rises today
Alt: -29.09°   Az: 233.51°   Direction: South-West

Arkab Posterior, also designated as β2 Sagittarii (beta2 Sagittarii), is a giant star of spectral class F2 in the constellation of Sagittarius.

Arkab Posterior visual magnitude is 4.29. Because of its moderate brightness, Arkab Posterior 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 Posterior - β2 Sagittarii (beta2 Sagittarii) star
DSS2 image of Arkab Posterior. The red arrow shows the motion of Arkab Posterior during the next 1000 years (1.62 arcmin in Right Ascension and -0.90 arcmin in declination);

Celestial Coordinates

Apparent

19h 25m 02s
-44° 44’ 56”
05h 26m 23s
00h 51m 26s

J2000

19h 23m 13s
-44° 47’ 58”

Galactic Coordinates

353.28°
-24.11°

Finder Chart

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Finder chart for Arkab Posterior - β2 Sagittarii (beta2 Sagittarii).

Magnitude, Color, Spectral Class

4.29
Giant

1.15
F2III
7217K

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

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

Distance, Radial Speed, Proper Motion

Arkab Posterior is distant 138.61 light years from the Sun and it is moving far from the Sun at the speed of 19 kilometers per second.

42.52
138.61
19 km/s
0.097 arcsec/y
-0.054"/y

Alternative Designations

Arkab Posterior
β2 Sagittarii
(beta2 Sagittarii)
SAO229654
SAO229654

Visibility from Your Location

Arkab Posterior - β2 Sagittarii (beta2 Sagittarii) is currently not visible from Greenwich, UK