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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 5:05 
Transit: 12:56 
Sunset: 20:48
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All Constellations » Ophiuchus » 

σ Ophiuchi (sigma Ophiuchi)

Above the horizon.  Rise: 20:21 | Tran: 2:43 | Set: 9:02
Alt: 12.26°   Az: 261.09°   Direction: West

σ Ophiuchi is a variable bright giant star of spectral class K2 in the constellation of Ophiuchus.

σ Ophiuchi visual magnitude is 4.34. Because of its moderate brightness, σ Ophiuchi 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 σ Ophiuchi (sigma Ophiuchi) star
DSS2 image of σ Ophiuchi. The red arrow shows the motion of σ Ophiuchi during the next 100000 years (6.67 arcmin in Right Ascension and 11.67 arcmin in declination);

Celestial Coordinates

Apparent

17h 27m 46s
+04° 07’ 12”
05h 01m 46s
22h 29m 33s

J2000

17h 26m 30s
+04° 08’ 25”

Galactic Coordinates

26.77°
20.75°

Finder Chart

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Finder chart for σ Ophiuchi (sigma Ophiuchi).

Magnitude, Color, Spectral Class

4.34
Bright giant

-3.44
K2II
3794K

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

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

Distance, Radial Speed, Proper Motion

σ Ophiuchi is distant 1,172.66 light years from the Sun and it is moving towards the Sun at the speed of 27 kilometers per second.

359.71
1,172.66
-27 km/s
0.004 arcsec/y
0.007"/y

Alternative Designations

σ Ophiuchi
(sigma Ophiuchi)
49 Ophiuchi
SAO122387
SAO122387

Visibility from Your Location

Today's σ Ophiuchi (sigma Ophiuchi) rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 85.9°
Max altitude: 42.6°
Azimuth: 274.1°