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public LocationGreenwich, UK
Sunrise: 5:15 
Transit: 13:06 
Sunset: 20:56
sunny   (Daytime)   What's Visible Now?
All Constellations » Ophiuchus » 

μ Ophiuchi (mu Ophiuchi)

Below the horizon.  Rise: 17:05 | Tran: 22:22 | Set: 3:43
Alt: -43.92°   Az: 333.45°   Direction: North-North-West

μ Ophiuchi is a bright giant star of spectral class B8 in the constellation of Ophiuchus.

μ Ophiuchi visual magnitude is 4.62. Because of its moderate brightness, μ 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 μ Ophiuchi (mu Ophiuchi) star
DSS2 image of μ Ophiuchi. The red arrow shows the motion of μ Ophiuchi during the next 10000 years (-1.50 arcmin in Right Ascension and -2.83 arcmin in declination);

Celestial Coordinates


17h 39m 10s
-08° 07’ 54”
10h 44m 05s
04h 23m 16s


17h 37m 50s
-08° 07’ 08”

Galactic Coordinates


Finder Chart

Finder chart μ Ophiuchi (mu Ophiuchi) star
Simplified finder chart for μ Ophiuchi (mu Ophiuchi).

Magnitude, Color, Spectral Class

Bright giant
μ Ophiuchi is also a Mn chemically peculiar star.


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

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

Distance, Radial Speed, Proper Motion

μ Ophiuchi is distant 548.82 light years from the Sun and it is moving towards the Sun at the speed of 19 kilometers per second.

-19 km/s
-0.009 arcsec/y

Alternative Designations

μ Ophiuchi
(mu Ophiuchi)
57 Ophiuchi

Visibility from Your Location

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

Azimuth: 98.1°
Max altitude: 30.4°
Azimuth: 261.9°