θ Coronae Borealis (theta Coronae Borealis)

Below the horizon. Rise: 13:16 | Tran: 22:32 | Set: 7:52

Alt: -6.04° Az: 13.78° Direction: South

θ Coronae Borealis is a variable and double main-sequence star of spectral class B6 in the constellation of Corona Borealis.

θ Coronae Borealis visual magnitude is 4.14. Because of its moderate brightness, θ Coronae Borealis 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.

Image of θ Coronae Borealis (theta Coronae Borealis) star

DSS2 image of θ Coronae Borealis. The red arrow shows the motion of θ Coronae Borealis during the next 10000 years (-3.17 arcmin in Right Ascension and -1.83 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 15h 33m 57s

Declination +31° 16’ 28”

Hour Angle 13h 04m 20s

Sidereal Time 04h 38m 17s

J2000

Right Ascension 15h 32m 55s

Declination +31° 21’ 33”

Galactic Coordinates

Galactic Longitude 49.69°

Galactic Latitude 54.71°

Finder Chart

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Finder chart for θ Coronae Borealis (theta Coronae Borealis).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.14

Class Main-sequence

Absolute magnitude -0.76

Spectral Type B6V

Color Index (B-V) -0.13

Temperature 12103K

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

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

Star System Properties

θ Coronae Borealis is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the θ Coronae Borealis double sysyem:

Main star magnitude 4.14

Secondary star magnitude 5.54

Magnitude difference 1.4

Separation 0.5 arcsec

Distance, Radial Speed, Proper Motion

θ Coronae Borealis is distant 310.77 light years from the Sun and it is moving towards the Sun at the speed of 25 kilometers per second.

Distance (parsec) 95.33

Distance (light year) 310.77

Radial Speed -25 km/s

Proper Motion RA -0.019 arcsec/y

Proper Motion Dec -0.011"/y

Alternative Designations

Bayer designation θ Coronae Borealis
(theta Coronae Borealis)

Flamsteed designation 4 Coronae Borealis

Henry Draper Catalogue HD138749

SAO Catalogue SAO64769

Hipparcos Catalogue HIP76127

Durchmusterung Catalogue BD+31 2750

FK5 Catalogue 576

General Catalogue of Variable Stars 7134/5

Visibility from Your Location

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

Azimuth: 58.7° RISE 13:16

Max altitude: 69.8° TRANSIT 22:32

Azimuth: 301.3° SET 7:52

Set Location

Other stars in Corona Borealis