Home
Search Objects
Major Solar System Objects
Comets
Asteroids
Spacecrafts
Star Maps
Orbits
public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 5:04 
Transit: 13:06 
Sunset: 21:07
warning Set your observing location to get relevant data
wb_twilight   (Astronomical Twilight)  
Planets Visible Tonight
Planets Visible Tonight
 • 
What's Visible Now • The Sky Tonight
Search  close
All Constellations » Corona Borealis » 

θ Coronae Borealis (theta Coronae Borealis)

Above the horizon.  Rise: 11:34 | Tran: 20:50 | Set: 6:10
Alt: 32.25°   Az: 281.12°   Direction: West

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

15h 33m 57s
+31° 16’ 27”
05h 04m 34s
20h 38m 32s

J2000

15h 32m 55s
+31° 21’ 33”

Galactic Coordinates

49.69°
54.71°

Finder Chart

loader
  Loading map...
Finder chart for θ Coronae Borealis (theta Coronae Borealis).

Magnitude, Color, Spectral Class

4.14
Main-sequence

-0.76
B6V
12103K

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

HR 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:

4.14
5.54
1.4
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.

95.33
310.77
-25 km/s
-0.019 arcsec/y
-0.011"/y

Alternative Designations

θ Coronae Borealis
(theta Coronae Borealis)
4 Coronae Borealis
SAO64769
SAO64769

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°
Max altitude: 69.8°
Azimuth: 301.3°