T Coronae Borealis (T CrB)

Above the horizon. Rise: 7:26 | Tran: 15:53 | Set: 0:20

Alt: 0.27° Az: 313.96° Direction: North-West

T CrB is a famous recurrent nova of spectral class M3 . 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:

Magnitude 10.170 ± 0.003

Measured on: 2024-10-07 18:23:30 UTC
Instrument: CCD; Filter: V; Observer: TRT
Credits: AAVSO International Database

Image of T Coronae Borealis (T CrB) 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

Right Ascension 16h 00m 32s

Declination +25° 51’ 04”

Hour Angle 08h 27m 31s

Sideral Time 00h 28m 03s

J2000

Right Ascension 15h 59m 30s

Declination +25° 55’ 13”

Galactic Coordinates

Galactic Longitude 42.37°

Galactic Latitude 48.16°

Finder Chart

Simplified finder chart for T Coronae Borealis (T CrB).

Magnitude, Color, Spectral Class

Color ⬤

Class Subdwarf

Absolute magnitude 1.27

Spectral Type M3

Color Index (B-V) 1.28

Temperature 4158K

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

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

Distance, Radial Speed, Proper Motion

T Coronae Borealis is distant 2,627.56 light years from the Sun and it is moving towards the Sun at the speed of 29 kilometers per second.

Distance (parsec) 806.00

Distance (light year) 2,627.56

Radial Speed -29 km/s

Proper Motion RA -0.005 arcsec/y

Proper Motion Dec 0.013"/y

Alternative Designations

Henry Draper Catalogue HD143454

SAO Catalogue SAO84129

Durchmusterung Catalogue BD+26 2765

General Catalogue of Variable Stars T CrB

Visibility from Your Location

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

Azimuth: 64.1° RISE 7:26

Max altitude: 64.4° TRANSIT 15:53

Azimuth: 295.9° SET 0:20

Set Location

Other stars in Corona Borealis