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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:52  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
sleep NighttimeWhat's Visible Now?
All Constellations » Ophiuchus » 

66 Ophiuchi

Altitude: -7.9°   Azimuth: 72.7°   Direction: East-North-East

66 Ophiuchi is a variable main-sequence star in the constellation of Ophiuchus.

66 Ophiuchi visual magnitude is 4.64. Because of its moderate brightness, 66 Ophiuchi should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about 66 Ophiuchi:


66 Ophiuchi is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -7.9°
Azimuth: 72.7°
Direction: East-North-East

Celestial coordinates and finder chart of 66 Ophiuchi

66 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 66 Ophiuchi are provided in the following table:

18h 00m 15s
+04° 22’ 06”

The simplified sky map below shows the position of 66 Ophiuchi in the sky:

Finder chart 66 Ophiuchi star
Simplified finder chart for 66 Ophiuchi.

Visibility of 66 Ophiuchi from your location

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

Today's 66 Ophiuchi rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 85.6°
Max altitude: 42.9°
Azimuth: 274.4°

Digitized Sky Survey image of 66 Ophiuchi

The image below is a photograph of 66 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 66 Ophiuchi is 0.003 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 66 Ophiuchi star
DSS2 image of 66 Ophiuchi. The red arrow shows the motion of 66 Ophiuchi during the next 10000 years (0.50 arcmin in Right Ascension and -2.17 arcmin in declination);

Distance of 66 Ophiuchi from the Sun and relative movement

66 Ophiuchi is distant 676.35 light years from the Sun and it is moving towards the Sun at the speed of 13 kilometers per second.

207.47 pc
676.35 ly
-13 km/s
0.003 arcsec/year
-0.013 arcsec/year

Spectral properties of 66 Ophiuchi

66 Ophiuchi belongs to spectral class B2 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where 66 Ophiuchi is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 66 Ophiuchi. Attribution: Richard Powell / CC BY-SA

Alternative designations of 66 Ophiuchi

66 Ophiuchi