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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 5:01 
Transit: 12:56 
Sunset: 20:52
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All Constellations » Corona Borealis » 

T Coronae Borealis

Above the horizon.  Rise: 16:33 | Tran: 1:04 | Set: 9:32
Alt: 45.46°   Az: 106.17°   Direction: East-South-East

T CrB is a famous recurrent nova of spectral class B . It is a double star system made of a red giant and a white dwarf orbiting in 228 days. T CrB is usually around magnitude 10 however during outbursts it can reach magnitude 2. Previous outbursts have been observed in 1866 and 1946 and some studies suggest that a new outburst might happen in the second half of 2024.

Waiting for the Next Outburst

Monitor the most recent measurements of T Coronae Borealis visual magnitude:

10.051 ± 0.005
Measured on: 2025-05-21 10:51:06 UTC
Instrument: CCD; Filter: CV; Observer: IDG
Credits: AAVSO International Database
Image of T Coronae Borealis star
DSS2 image of T Coronae Borealis. The red arrow shows the motion of T Coronae Borealis during the next 10000 years (-0.83 arcmin in Right Ascension and 2.17 arcmin in declination);

Celestial Coordinates

Apparent

16h 00m 34s
+25° 50’ 58”
20h 46m 07s
12h 46m 41s

J2000

15h 59m 30s
+25° 55’ 13”

Galactic Coordinates

42.37°
48.16°

Finder Chart

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Finder chart for T Coronae Borealis.

Magnitude, Color, Spectral Class

Subdwarf

B
9028K

Alternative Designations

SAO84129
SAO84129

Visibility from Your Location

Today's T Coronae Borealis rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 64.2°
Max altitude: 64.4°
Azimuth: 295.8°