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:

Magnitude 10.051 ± 0.005

Measured on: 2025-05-21 10:51:06 UTC
Instrument: CCD; Filter: CV; Observer: IDG
Credits: AAVSO International Database

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 34s

Declination +25° 50’ 58”

Hour Angle 20h 46m 07s

Sidereal Time 12h 46m 41s

J2000

Right Ascension 15h 59m 30s

Declination +25° 55’ 13”

Galactic Coordinates

Galactic Longitude 42.37°

Galactic Latitude 48.16°

Finder Chart

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Finder chart for T Coronae Borealis.

Magnitude, Color, Spectral Class

Color ⬤

Class Subdwarf

Spectral Type B

Color Index (B-V) 0.1

Temperature 9028K

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 rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 64.2° RISE 16:33

Max altitude: 64.4° TRANSIT 1:04

Azimuth: 295.8° SET 9:32

Set Location

Other stars in Corona Borealis