We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
A Complete Guide to the Solar System and the Night Sky
Your support keeps us free & ad-free » Donate
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:35  
clear_day Transit: 12:10  
SunsetSet: 17:45
sunny DaytimeWhat's Visible Now?
All Constellations » Ophiuchus » 

Cebalrai - β Ophiuchi (beta Ophiuchi)

Altitude: 42.7°   Azimuth: 189.5°   Direction: South

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

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

The proper motion of Cebalrai is -0.04 arcsec per year in Right Ascension and 0.159 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

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);

Key facts about Cebalrai

2.77
Giant

Cebalrai - β Ophiuchi (beta Ophiuchi) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 42.7°
Azimuth: 189.5°
Direction: South

Celestial coordinates and finder chart of Cebalrai

Cebalrai 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 Cebalrai are provided in the following table:

17h 43m 28s
+04° 34’ 01”
29.21°
17.19°
Ophiuchus

The simplified sky map below shows the position of Cebalrai in the sky:

Finder chart Cebalrai - β Ophiuchi (beta Ophiuchi) star
Simplified finder chart for Cebalrai - β Ophiuchi (beta Ophiuchi).

Visibility of Cebalrai 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 Cebalrai - β Ophiuchi (beta 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: 85.4°
Max altitude: 43.1°
Azimuth: 274.6°

Distance of Cebalrai from the Sun and relative movement

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.

25.14 pc
81.95 ly
-12 km/s
-0.04 arcsec/year
0.159 arcsec/year

Spectral properties of Cebalrai

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

0.77
K2III
4389K

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

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

Alternative designations of Cebalrai

Cebalrai
β Ophiuchi
(beta Ophiuchi)
60 Ophiuchi
SAO122671
SAO122671