23 Ophiuchi

Above the horizon. Rise: 21:00 | Tran: 2:31 | Set: 7:58

Alt: 26.60° Az: 214.62° Direction: South-West

23 Ophiuchi is a giant star of spectral class K2 in the constellation of Ophiuchus.

23 Ophiuchi visual magnitude is 5.25. Because of its faintness, 23 Ophiuchi is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

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);

Celestial Coordinates

Apparent

Right Ascension 16h 55m 57s

Declination -06° 11’ 35”

Hour Angle 02h 02m 55s

Sidereal Time 18h 58m 52s

J2000

Right Ascension 16h 54m 35s

Declination -06° 09’ 14”

Galactic Coordinates

Galactic Longitude 12.89°

Galactic Latitude 22.52°

Finder Chart

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Finder chart for 23 Ophiuchi.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.25

Class Giant

Absolute magnitude 0.84

Spectral Type K2III

Color Index (B-V) 1.08

Temperature 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

Distance, Radial Speed, Proper Motion

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

Distance (light year) 248.10

Radial Speed -17 km/s

Proper Motion RA -0.031 arcsec/y

Proper Motion Dec -0.02"/y

Alternative Designations

Flamsteed designation 23 Ophiuchi

Henry Draper Catalogue HD152601

SAO Catalogue SAO141431

Hipparcos Catalogue HIP82730

Durchmusterung Catalogue BD-05 4374

FK5 Catalogue 3342

Visibility from Your Location

Today's 23 Ophiuchi rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 96.2° RISE 21:00

Max altitude: 32.3° TRANSIT 2:31

Azimuth: 263.8° SET 7:58

Set Location

Other stars in Ophiuchus