χ Ophiuchi (chi Ophiuchi)

Above the horizon. Rise: 21:29 | Tran: 1:52 | Set: 6:11

Alt: 8.21° Az: 225.86° Direction: South-West

χ Ophiuchi is a variable sub-giant star of spectral class B2 in the constellation of Ophiuchus.

χ Ophiuchi visual magnitude is 4.42. Because of its moderate brightness, χ Ophiuchi is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

DSS2 image of χ Ophiuchi. The red arrow shows the motion of χ Ophiuchi during the next 10000 years (-0.33 arcmin in Right Ascension and -3.67 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 16h 28m 29s

Declination -18° 30’ 42”

Hour Angle 03h 14m 02s

Sidereal Time 19h 42m 32s

J2000

Right Ascension 16h 27m 01s

Declination -18° 27’ 23”

Galactic Coordinates

Galactic Longitude 357.93°

Galactic Latitude 20.68°

Finder Chart

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Finder chart for χ Ophiuchi (chi Ophiuchi).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.42

Class Sub-giant

Absolute magnitude -1.46

Spectral Type B2IV

Color Index (B-V) 0.28

Temperature 7591K

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

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

Distance, Radial Speed, Proper Motion

χ Ophiuchi is distant 488.76 light years from the Sun and it is moving towards the Sun at the speed of 3 kilometers per second.

Distance (parsec) 149.93

Distance (light year) 488.76

Radial Speed -3 km/s

Proper Motion RA -0.002 arcsec/y

Proper Motion Dec -0.022"/y

Alternative Designations

Bayer designation χ Ophiuchi
(chi Ophiuchi)

Flamsteed designation 7 Ophiuchi

Henry Draper Catalogue HD148184

SAO Catalogue SAO159918

Hipparcos Catalogue HIP80569

Durchmusterung Catalogue BD-18 4282

FK5 Catalogue 3298

General Catalogue of Variable Stars Chi Oph

Visibility from Your Location

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

Azimuth: 108.5° RISE 21:29

Max altitude: 20.0° TRANSIT 1:52

Azimuth: 251.5° SET 6:11

Set Location

Other stars in Ophiuchus