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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 » 

30 Ophiuchi

Below the horizon.  Rise: 20:37 | Tran: 2:18 | Set: 7:55
Alt: -25.95°   Az: 61.40°   Direction: East-North-East

30 Ophiuchi is a variable and double giant star of spectral class K4 in the constellation of Ophiuchus.

30 Ophiuchi visual magnitude is 4.82. Because of its moderate brightness, 30 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 30 Ophiuchi star
DSS2 image of 30 Ophiuchi. The red arrow shows the motion of 30 Ophiuchi during the next 10000 years (-6.83 arcmin in Right Ascension and -12.50 arcmin in declination);

Celestial Coordinates

Apparent

17h 02m 24s
-04° 15’ 28”
15h 29m 21s
08h 31m 45s

J2000

17h 01m 03s
-04° 13’ 21”

Galactic Coordinates

15.58°
22.18°

Finder Chart

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Finder chart for 30 Ophiuchi.

Magnitude, Color, Spectral Class

4.82
Giant

-0.63
K4III
3824K

The red dot in the diagram below shows where 30 Ophiuchi is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 30 Ophiuchi. Attribution: Richard Powell / CC BY-SA

Star System Properties

30 Ophiuchi is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the 30 Ophiuchi double sysyem:

4.82
9.62
4.8
94.1 arcsec

Distance, Radial Speed, Proper Motion

30 Ophiuchi is distant 401.97 light years from the Sun and it is moving towards the Sun at the speed of 7 kilometers per second.

123.30
401.97
-7 km/s
-0.041 arcsec/y
-0.075"/y

Alternative Designations

30 Ophiuchi
SAO141483
SAO141483

Visibility from Your Location

Today's 30 Ophiuchi rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 94.3°
Max altitude: 34.3°
Azimuth: 265.7°