ο Ophiuchi (omicron Ophiuchi)

ο Ophiuchi is a double sub-giant star in the constellation of Ophiuchus.

ο Ophiuchi visual magnitude is 6.8. Because of its reltive faintness, ο 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 ο Ophiuchi:

Color of ο Ophiuchi ⬤

Magnitude of ο Ophiuchi 6.8

Class Sub-giant

VISIBILITY RIGHT NOW ο Ophiuchi (omicron Ophiuchi) is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of ο Ophiuchi

ο 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 ο Ophiuchi are provided in the following table:

Right Ascension J2000 17h 18m 00s

Declination J2000 -24° 17’ 03”

Galactic Longitude 0.55°

Galactic Latitude 7.71°

Constellation Ophiuchus

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

Finder chart ο Ophiuchi (omicron Ophiuchi) star

Simplified finder chart for ο Ophiuchi (omicron Ophiuchi).

Visibility of ο Ophiuchi from your location

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

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

Azimuth: 114.3° RISE 2:00

Max altitude: 14.2° TRANSIT 5:40

Azimuth: 245.7° SET 9:21

RIGHT NOW ο Ophiuchi (omicron Ophiuchi) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of ο Ophiuchi

The image below is a photograph of ο 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 ο Ophiuchi is -0.073 arcsec per year in Right Ascension and -0.009 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of ο Ophiuchi (omicron Ophiuchi) star

DSS2 image of ο Ophiuchi. The red arrow shows the motion of ο Ophiuchi during the next 10000 years (-12.17 arcmin in Right Ascension and -1.50 arcmin in declination);

Distance of ο Ophiuchi from the Sun and relative movement

ο Ophiuchi is distant 480.83 light years from the Sun and it is moving towards the Sun at the speed of 28 kilometers per second.

Distance (parsec) 147.49 pc

Distance (light year) 480.83 ly

Heliocentric radial velocity -28 km/s

Proper Motion RA -0.073 arcsec/year

Proper Motion Dec -0.009 arcsec/year

Spectral properties of ο Ophiuchi

ο Ophiuchi belongs to spectral class F6 and has a luminosity class of IV corresponding to a sub-giant star.

Absolute magnitude 0.96

Spectral Type F6IV

Color Index (B-V) 0.51

Temperature of ο Ophiuchi 6344K

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

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

ο Ophiuchi star system properties

ο 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 ο Ophiuchi double sysyem:

Main star magnitude 6.8

Secondary star magnitude 8.3

Magnitude difference 1.5

Separation 10.2 arcsec

Alternative designations of ο Ophiuchi

Bayer designation ο Ophiuchi
(omicron Ophiuchi)

Flamsteed designation 39 Ophiuchi

Henry Draper Catalogue HD156350

SAO Catalogue SAO185237

Hipparcos Catalogue HIP84625

Durchmusterung Catalogue CD-2413255

Aitken Double Star Catalogue ADS10442

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Other stars in Ophiuchus