72 Ophiuchi

Altitude: -16.4° Azimuth: 310.3° Direction: North-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 table below summarizes the key facts about 72 Ophiuchi:

Color of 72 Ophiuchi ⬤

Magnitude of 72 Ophiuchi 3.73

Class Sub-giant

VISIBILITY RIGHT NOW

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

Altitude: -16.4°
Azimuth: 310.3°
Direction: North-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:

Right Ascension J2000 18h 07m 20s

Declination J2000 +09° 33’ 50”

Galactic Longitude 36.59°

Galactic Latitude 14.09°

Constellation Ophiuchus

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

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° RISE 19:27

Max altitude: 48.1° TRANSIT 2:18

Azimuth: 279.6° SET 9:05

RIGHT NOW 72 Ophiuchi is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 72 Ophiuchi

The image below is a photograph of 72 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 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.

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);

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.

Distance (parsec) 25.38 pc

Distance (light year) 82.74 ly

Heliocentric radial velocity -24 km/s

Proper Motion RA -0.06 arcsec/year

Proper Motion Dec 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.

Absolute magnitude 1.71

Spectral Type A4IV

Color Index (B-V) 0.12

Temperature of 72 Ophiuchi 8839K

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

Main star magnitude 3.73

Secondary star magnitude 11.43

Magnitude difference 7.7

Separation 54.4 arcsec

Alternative designations of 72 Ophiuchi

Flamsteed designation 72 Ophiuchi

Henry Draper Catalogue HD165777

SAO Catalogue SAO123142

Hipparcos Catalogue HIP88771

Durchmusterung Catalogue BD+09 3564

Gliese Catalogue Wo 9615 A

FK5 Catalogue 680

Aitken Double Star Catalogue ADS11076

In Evidence

Other stars in Ophiuchus