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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 5:07 
Transit: 12:56 
Sunset: 20:45
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All Constellations » Ophiuchus » 

θ Ophiuchi (theta Ophiuchi)

Below the horizon.  Rise: 23:08 | Tran: 2:47 | Set: 6:22
Alt: -61.49°   Az: 27.14°   Direction: North-North-East

θ Ophiuchi is a variable and double sub-giant star of spectral class B2 in the constellation of Ophiuchus.

θ Ophiuchi visual magnitude is 3.27. Because of its moderate brightness, θ 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 θ Ophiuchi (theta Ophiuchi) star
DSS2 image of θ Ophiuchi. The red arrow shows the motion of θ Ophiuchi during the next 10000 years (-0.67 arcmin in Right Ascension and -3.33 arcmin in declination);

Celestial Coordinates

Apparent

17h 23m 34s
-25° 01’ 20”
12h 55m 37s
06h 19m 11s

J2000

17h 22m 00s
-24° 59’ 57”

Galactic Coordinates

0.46°
6.55°

Finder Chart

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Finder chart for θ Ophiuchi (theta Ophiuchi).

Magnitude, Color, Spectral Class

3.27
Sub-giant

-2.92
B2IV
14087K

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

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

Star System Properties

θ Ophiuchi is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the θ Ophiuchi double sysyem:

3.27
5.27
2
0 arcsec

Distance, Radial Speed, Proper Motion

θ Ophiuchi is distant 563.04 light years from the Sun and it is moving towards the Sun at the speed of 2 kilometers per second.

172.71
563.04
-2 km/s
-0.004 arcsec/y
-0.02"/y

Alternative Designations

θ Ophiuchi
(theta Ophiuchi)
42 Ophiuchi
SAO185320
SAO185320

Visibility from Your Location

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

Azimuth: 115.0°
Max altitude: 13.5°
Azimuth: 245.0°