Archive for the ‘T Corona Borealis’ category

T Corona Borealis: February 2026 Still Waiting And Watching

February 7, 2026

The last outburst of T occurred February 9th 1946…80 years ago.  Renowned variable star observer, Leslie Peltier missed the event due to an illness and went back to bed, and seemingly never forgave himself.  He had planned his observation for 2:30 AM.

Coordinates: RA: 15h 59m Dec. +25º 55m

The first observed outburst of T Corona Borealis occurred on the night of May 12th 1866, when the star was about the brightness as Alpha Coronae, magnitude 2.2. (Source: Burnham’s Celestial Handbook; Volume Two; Page 708

Following photos: I’ll post the most current or recent first, and deleting some of the earlier ones, maintaining about ten or so photos for review.

I have all photos (saved in my photo file) since making my first cellphone photo on April 26th 2025, but not shown in this post.

Where is T located in the constellation? The following photo is from wikisky.org and has T marked with an X and inside the box.

March 27th 2026 @ 3:07 AM: Very poor transparency due to the 72% illuminated waxing gibbous moon with high pollen in the air:

March 22nd @ 1:57 AM

March 20th @ 4:16 AM from my backyard:

March 19th 2026 @ 12:32 AM EDT: I made the following photo from my upstairs bedroom window! So, for the time being, I don’t even need to go outside to check on T! Look at the photo closely and you can see the top of the window…in the upper left.

March 15th 2026 @ 3:32 AM

March 13th 2026 @ 2:46 AM

Monday February 16th 2026 @ 2:31AM

Monday: February 16th @ 2:32 AM

February 13th 2026 @ 4:48AM EST: Corona Borealis is really high in the sky at this time, but in excellent position.

Thursday, February 12th @ 3:15 AM (The handle of Ursa Major in the upper left and Arcturus to the right)

I removed or deleted many of my cellphone photos, but have included my first photo (below) from April 26th 2025 :

Recurrent Novae Star T CrB: Now Is The Time To Be Watching For The Predicted Outburst

April 3, 2025

For those waiting and watching for the predicted outburst of recurrent novae star, T Corona Borealis, the excitement is building, but no one knows when the event will happen.

I’ve been making photos of the constellation Corona Borealis as often as possible since March (2025) using my cellphone with 3-second exposures. When the outburst “finally” occurs, there will be the appearance of a “new star” in the constellation and visible without optical aid. The outburst could become the brightest star in the constellation, possibly reach a magnitude of 2.0 or even brighter.

For the location of T, see the (X) inside the box, which at current or before the outburst is shinning at ~10, which is much fainter than can be seen without optical aid. Image as following and credit to wikisky.org

The following photo was made this morning…Saturday February 7th 2026 @ 2:56 AM: Corona Borealis is in perfect sky position, high in the east.  The bright moon made the constellation difficult to see without optical aid.   

In his book Starlight Nights,Peltier writes:

“I alone am to blame for being remiss in my duties, nevertheless, I still have the feeling that T could have shown me more consideration. We had been friends for many years; on thousands of nights I had watched over it as it slept, and then it arose in my hour of weakness as I nodded at my post. I still am watching it but now it is with a wary eye. There is no warmth between us any more.” Leslie Peltier

The following picture is provided just for reference as to the location of T, however, not likely will it be this bright as related to other stars in the constellation, but lets keep watch.

The following excerpts are from a “Sky & Telescope” online article.

Take T Coronae Borealis (T CrB). It’s one of only about 10 stars in the entire sky classified as a recurrent nova, with two recorded outbursts to its name. Normally, the star slumbers at 10th magnitude, but on May 12, 1866, it hit the roof, reaching magnitude +2.0 and outshining every star in Corona Borealis before quickly fading back to obscurity. Eighty years later, on February 9, 1946, it sprang back to life, topping out at magnitude +3.0.

“I alone am to blame for being remiss in my duties, nevertheless, I still have the feeling that T could have shown me more consideration. We had been friends for many years; on thousands of nights I had watched over it as it slept, and then it arose in my hour of weakness as I nodded at my post. I still am watching it but now it is with a wary eye. There is no warmth between us any more.”

T stayed under the radar for the next 69 years, holding steady around magnitude +10.2–10.3. That began to change in February 2015, when it inched up to +10.0 and remained there until early February this year. That’s when things kicked into high gear with the star steadily growing brighter from late winter through early spring to reach its current magnitude of ~9.2.

Alongside the brightening trend, T’s become bluer as well. Astronomers describe its recent unprecedented activity as a star entering a “super active” state. This last happened in 1938, eight years before its last great outburst.

Two For T
Stars like T CrB involve a red giant closely paired with a white dwarf. The giant feeds hydrogen gas into a swirling accretion disk around a massive, compact white dwarf at a rate a million times greater than the solar wind. Material funnels from the disk onto the dwarf’s surface until it ignites in a thermonuclear explosion similar to a nova.
NASA