Your guide to the Solar System and the night sky
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🌎  Observing from: Greenwich, United Kingdom [change]
🌅 Sunrise: 6:38  ☀️ Transit: 13:03  🌅 Sunset: 19:28

16 Ophiuchi

16 Ophiuchi is a giant star in the constellation of Ophiuchus.

16 Ophiuchi visual magnitude is 6.03. Because of its reltive faintness, 16 Ophiuchi should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about 16 Ophiuchi:

16 Ophiuchi is above the horizon from Greenwich, United Kingdom [change]. Altitude: 0°.

Celestial coordinates and finder chart of 16 Ophiuchi

16 Ophiuchi is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 16 Ophiuchi are provided in the following table:

16h 45m 29s
+01° 01’ 13”

The simplified sky map below shows the position of 16 Ophiuchi in the sky:

Finder chart 16 Ophiuchi star
Simplified finder chart for 16 Ophiuchi.

Visibility of 16 Ophiuchi from your location

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's 16 Ophiuchi rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 89.0°
Max altitude: 39.5°
Azimuth: 271.0°
16 Ophiuchi is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 16 Ophiuchi

The image below is a photograph of 16 Ophiuchi from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of 16 Ophiuchi is 0.002 arcsec per year in Right Ascension and 0.013 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 16 Ophiuchi star
DSS2 image of 16 Ophiuchi. The red arrow shows the motion of 16 Ophiuchi during the next 10000 years (0.33 arcmin in Right Ascension and 2.17 arcmin in declination);

Distance of 16 Ophiuchi from the Sun and relative movement

16 Ophiuchi is distant 476.61 light years from the Sun and it is moving towards the Sun at the speed of 13 kilometers per second.

146.20 pc
476.61 ly
-13 km/s
0.002 arcsec/year
0.013 arcsec/year

Spectral properties of 16 Ophiuchi

16 Ophiuchi belongs to spectral class B9 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 16 Ophiuchi is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 16 Ophiuchi. Attribution: Richard Powell / CC BY-SA

Alternative designations of 16 Ophiuchi

16 Ophiuchi