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 » 

T Coronae Borealis

Above the horizon.  Rise: 12:49 | Tran: 21:16 | Set: 5:48
Alt: 30.13°   Az: 274.61°   Direction: West

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:

11.1296 ± 0.0009
Measured on: 2025-07-16 08:34:42 UTC
Instrument: CCD; Filter: B; Observer: WGR
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’ 57”
04h 53m 18s
20h 53m 52s

J2000

15h 59m 30s
+25° 55’ 13”

Galactic Coordinates

42.37°
48.16°

Finder Chart

loader
  Loading map...
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°