ο Coronae Borealis (omicron Coronae Borealis)

Above the horizon. Rise: 7:30 | Tran: 16:28 | Set: 1:31

Alt: 21.03° Az: 68.61° Direction: East-North-East

ο Coronae Borealis is a variable and double hypergiant star of spectral class K0 in the constellation of Corona Borealis.

ο Coronae Borealis visual magnitude is 5.51. Because of its faintness, ο Coronae Borealis 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.

Image of ο Coronae Borealis (omicron Coronae Borealis) star

DSS2 image of ο Coronae Borealis. The red arrow shows the motion of ο Coronae Borealis during the next 1000 years (-2.00 arcmin in Right Ascension and -0.78 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 15h 21m 10s

Declination +29° 31’ 40”

Hour Angle 17h 48m 43s

Sideral Time 09h 09m 53s

J2000

Right Ascension 15h 20m 08s

Declination +29° 36’ 57”

Galactic Coordinates

Galactic Longitude 46.21°

Galactic Latitude 57.33°

Finder Chart

Simplified finder chart for ο Coronae Borealis (omicron Coronae Borealis).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.51

Class Hypergiant

Absolute magnitude 0.89

Spectral Type K0III

Color Index (B-V) 1.02

Temperature 4695K

The red dot in the diagram below shows where ο Coronae Borealis is situated in the Hertzsprung–Russell diagram.

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

Star System Properties

ο Coronae Borealis is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the ο Coronae Borealis double sysyem:

Main star magnitude 5.51

Secondary star magnitude 9.41

Magnitude difference 3.9

Separation 147.3 arcsec

Distance, Radial Speed, Proper Motion

ο Coronae Borealis is distant 273.95 light years from the Sun and it is moving towards the Sun at the speed of 53 kilometers per second.

Distance (parsec) 84.03

Distance (light year) 273.95

Radial Speed -53 km/s

Proper Motion RA -0.12 arcsec/y

Proper Motion Dec -0.047"/y

Alternative Designations

Bayer designation ο Coronae Borealis
(omicron Coronae Borealis)

Flamsteed designation 1 Coronae Borealis

Henry Draper Catalogue HD136512

SAO Catalogue SAO83768

Hipparcos Catalogue HIP75049

Durchmusterung Catalogue BD+30 2647

General Catalogue of Variable Stars 7032

Visibility from Your Location

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

Azimuth: 60.5° RISE 7:30

Max altitude: 68.0° TRANSIT 16:28

Azimuth: 299.5° SET 1:31

Name:	Greenwich, UK
Latitude:	51° 28' 48.0" N
Longitude:	0° 0' 0.0" E
Timezone:	Europe/London

Location

Other stars in Corona Borealis