Cebalrai - β Ophiuchi (beta Ophiuchi)

Above the horizon. Rise: 20:27 | Tran: 2:52 | Set: 9:13

Alt: 15.11° Az: 258.04° Direction: West-South-West

Cebalrai, also designated as β Ophiuchi (beta Ophiuchi), is a giant star of spectral class K2 in the constellation of Ophiuchus.

Cebalrai visual magnitude is 2.77. Because of its brightness, Cebalrai is clearly visible to the naked eye when observed from locations with dark skies, and should be also quite easily visible from light polluted areas.

Image of Cebalrai - β Ophiuchi (beta Ophiuchi) star

DSS2 image of Cebalrai. The red arrow shows the motion of Cebalrai during the next 1000 years (-0.67 arcmin in Right Ascension and 2.65 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 17h 44m 43s

Declination +04° 33’ 26”

Hour Angle 04h 45m 22s

Sidereal Time 22h 30m 06s

J2000

Right Ascension 17h 43m 28s

Declination +04° 34’ 01”

Galactic Coordinates

Galactic Longitude 29.21°

Galactic Latitude 17.19°

Finder Chart

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Finder chart for Cebalrai - β Ophiuchi (beta Ophiuchi).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 2.77

Class Giant

Absolute magnitude 0.77

Spectral Type K2III

Color Index (B-V) 1.16

Temperature 4389K

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

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

Distance, Radial Speed, Proper Motion

Cebalrai is distant 81.95 light years from the Sun and it is moving towards the Sun at the speed of 12 kilometers per second.

Distance (parsec) 25.14

Distance (light year) 81.95

Radial Speed -12 km/s

Proper Motion RA -0.04 arcsec/y

Proper Motion Dec 0.159"/y

Alternative Designations

Proper Name Cebalrai

Bayer designation β Ophiuchi
(beta Ophiuchi)

Flamsteed designation 60 Ophiuchi

Henry Draper Catalogue HD161096

SAO Catalogue SAO122671

Hipparcos Catalogue HIP86742

Durchmusterung Catalogue BD+04 3489

FK5 Catalogue 665

Visibility from Your Location

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

Azimuth: 85.4° RISE 20:27

Max altitude: 43.1° TRANSIT 2:52

Azimuth: 274.6° SET 9:13

Set Location

Other stars in Ophiuchus