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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
SunriseRise: 7:01  
clear_day Transit: 12:12  
SunsetSet: 17:24
sunny DaytimeWhat's Visible Now?
All Constellations » Ophiuchus » 

72 Ophiuchi

Altitude: 8.5°   Azimuth: 274.7°   Direction: West

72 Ophiuchi is a multiple sub-giant star in the constellation of Ophiuchus.

72 Ophiuchi visual magnitude is 3.73. Because of its moderate brightness, 72 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 proper motion of 72 Ophiuchi is -0.06 arcsec per year in Right Ascension and 0.08 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 72 Ophiuchi star
DSS2 image of 72 Ophiuchi. The red arrow shows the motion of 72 Ophiuchi during the next 10000 years (-10.00 arcmin in Right Ascension and 13.33 arcmin in declination);

Key facts about 72 Ophiuchi

3.73
Sub-giant

72 Ophiuchi is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 8.5°
Azimuth: 274.7°
Direction: West

Celestial coordinates and finder chart of 72 Ophiuchi

72 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 72 Ophiuchi are provided in the following table:

18h 07m 20s
+09° 33’ 50”
36.59°
14.09°
Ophiuchus

The simplified sky map below shows the position of 72 Ophiuchi in the sky:

Finder chart 72 Ophiuchi star
Simplified finder chart for 72 Ophiuchi.

Visibility of 72 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 72 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: 80.4°
Max altitude: 48.1°
Azimuth: 279.6°

Distance of 72 Ophiuchi from the Sun and relative movement

72 Ophiuchi is distant 82.74 light years from the Sun and it is moving towards the Sun at the speed of 24 kilometers per second.

25.38 pc
82.74 ly
-24 km/s
-0.06 arcsec/year
0.08 arcsec/year

Spectral properties of 72 Ophiuchi

72 Ophiuchi belongs to spectral class A4 and has a luminosity class of IV corresponding to a sub-giant star.

1.71
A4IV
8839K

The red dot in the diagram below shows where 72 Ophiuchi is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 72 Ophiuchi. Attribution: Richard Powell / CC BY-SA

72 Ophiuchi star system properties

72 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 72 Ophiuchi double sysyem:

3.73
11.43
7.7
54.4 arcsec

Alternative designations of 72 Ophiuchi

72 Ophiuchi
SAO123142
SAO123142
Wo 9615 A