23 Ophiuchi

Altitude: 17.2° Azimuth: 124.7° Direction: South-East

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

23 Ophiuchi visual magnitude is 5.25. Because of its reltive faintness, 23 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 23 Ophiuchi:

Color of 23 Ophiuchi ⬤

Magnitude of 23 Ophiuchi 5.25

Class Giant

VISIBILITY RIGHT NOW

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

Altitude: 17.2°
Azimuth: 124.7°
Direction: South-East

Celestial coordinates and finder chart of 23 Ophiuchi

23 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 23 Ophiuchi are provided in the following table:

Right Ascension J2000 16h 54m 35s

Declination J2000 -06° 09’ 14”

Galactic Longitude 12.89°

Galactic Latitude 22.52°

Constellation Ophiuchus

The simplified sky map below shows the position of 23 Ophiuchi in the sky:

Simplified finder chart for 23 Ophiuchi.

Visibility of 23 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 23 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: 96.2° RISE 6:31

Max altitude: 32.4° TRANSIT 11:58

Azimuth: 263.8° SET 17:25

Digitized Sky Survey image of 23 Ophiuchi

The image below is a photograph of 23 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 23 Ophiuchi is -0.031 arcsec per year in Right Ascension and -0.02 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of 23 Ophiuchi. The red arrow shows the motion of 23 Ophiuchi during the next 10000 years (-5.17 arcmin in Right Ascension and -3.33 arcmin in declination);

Distance of 23 Ophiuchi from the Sun and relative movement

23 Ophiuchi is distant 248.10 light years from the Sun and it is moving towards the Sun at the speed of 17 kilometers per second.

Distance (parsec) 76.10 pc

Distance (light year) 248.10 ly

Heliocentric radial velocity -17 km/s

Proper Motion RA -0.031 arcsec/year

Proper Motion Dec -0.02 arcsec/year

Spectral properties of 23 Ophiuchi

23 Ophiuchi belongs to spectral class K2 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude 0.84

Spectral Type K2III

Color Index (B-V) 1.08

Temperature of 23 Ophiuchi 4559K

The red dot in the diagram below shows where 23 Ophiuchi is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 23 Ophiuchi. Attribution: Richard Powell / CC BY-SA

Alternative designations of 23 Ophiuchi

Flamsteed designation 23 Ophiuchi

Henry Draper Catalogue HD152601

SAO Catalogue SAO141431

Hipparcos Catalogue HIP82730

Durchmusterung Catalogue BD-05 4374

FK5 Catalogue 3342

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In Evidence

Other stars in Ophiuchus