T CrB - overview of the accretion history, Roche-lobe filling, orbital solution, and radiative modeling: https://arxiv.org/abs/2507.23323 -> "Expectations for an imminent new outburst of the recurrent symbiotic nova #TCrB are mounting, initiated by the discovery in 2015 of a new enhanced mass-transfer phase (SAP), which is reminiscent of the one preceding the last recorded outburst in 1946. [...] SAP has been caused by an inside-out collapse of the disk, during which the mean accretion rate onto the WD has been ~28x larger than in quiescence. SAP ended in April 2023, but from May 2024 mass-flow has intensively resumed at disk inner radii while the collapse wave reached the outer portions of the disk; the consequent revamp in mass accretion could fill the gap inherited by the fainter 2015-2023 SAP and eventually lead the WD accreted shell to ignition."
#TCrB
#TCorBor magnitude 10.0
Source AAVSO, Observer: HBB on 2025-06-26
#blazeStar #TCrB
Regarding T CrB, the star behaves in the same manner as in recent months. So we have no real clue when its outburst will happen.
These are my most recent photometric observations of this recurrent nova star (Fig. 1).
I am complementing my observations with a comparison of the spectra with data from AAVSO’s observer PROI (Fig. 2).
The blue spectrum corresponds to when T CrB was close to its peak brightness at the end of March. The red spectrum was captured three days ago, when this star seemed less bright.
Finally tracked down the overdue nova T Coronae Borealis by star hopping. It was gratifyingly unimpressive 😃
Heute, 27.3., ist der eine auf Basis der #Umlaufbahnen vom #Doppelgestirn berechnete Termin!
Seit Monaten erwarten #Astronomie Fans das mit bloßem Auge sichtbare Aufleuchten einer #Nova ✨im #Sternbild Corona Borealis
Wo ihr hingehauen müsst, um den "neuen Stern" zu sehen - gesetzt den Fall, der Weisse Zwerg wird zur #Nova und das Wetter passt - zeigt euch mein
- Video: https://youtu.be/NF4NWw2EuWM
- Info: https://www.fr.de/wissen/warten-auf-die-nova-am-himmel-forscher-berechnet-termin-fuer-die-sternexplosion-zr-93640098.html
#TCrB #Sterngucker #Kosmos #Wissenschaft #Sternexplosion #science
Recurrent nova #TCrB is still collecting material to it's surface, critical level not yet achieved to start eruption. Here a graph during 2025-03-15_0020-0200UT with 40sec time resolution using B filter, taken at Y71 Makroskooppi observatory. Some brightness flickering of it's accretion disk is visible.
@coreyspowell One last thing: the incoming #TCrB nova might be a type Ia event. It sits 2500 light years from here and will present as a new "guest star" or might even cast a second shadow during the day if the Chandrasekar limit is hit. I guess you especially will enjoy those few days of sky gazing.
When is T Coronae Borealis going to explode?
Despite earlier predictions that it would explode by September 2024, we’re still waiting. But it will happen — and when it does, it will brighten only briefly, so try not to miss it.
https://www.astronomy.com/observing/when-is-t-crb-going-to-explode/ via @astronomymag
#TCrB
Is T Coronae Borealis About to Light Up?
https://fed.brid.gy/r/https://www.universetoday.com/170944/is-t-coronae-borealis-about-to-light-up/
While the spectrum of #TCrB is currently acting up - https://skyweek.wordpress.com/2025/02/16/allgemeines-live-blog-ab-dem-16-februar-2025/#Feb16 - this probably does *not* mean that the next big eruption of the recurrent nova is imminent: https://forums.aavso.org/t/observing-campaigns-875-monitoring-t-crb/946/60 and https://www.facebook.com/david.iadevaia/posts/pfbid026ZgWvaFhPjkcfX2EtCgfvRAVR7p6wqgZ3SA5QmiX1W2eua22zDYTTHFzpbNpC87Zl
A funny way to 'monitor' #TCrB: the view of Cam 2 of the #AllSky7 system https://allsky7.net/index.html?&station=AMS216#liveview on the roof of a school in #Bochum, Germany - the limiting magnitude is a bit better than 2 (in the currently moonlit sky), so if the star blows and reaches 2 mag. it would actually show up as another point of light similar and close to Gemma.
Les raies d'émission dans le spectre de #TCrB sont de plus en plus marquées, indiquant une augmentation de l'accretion dans le disque qui entoure la naine blanche. Bientôt le grand soir ? Peut-être...
Actuellement invisible à l'oeil, cette étoile le deviendra mais restera faible lors de la nova.
@skyglowberlin I’ve had my eye on #TCrB since last year. Exciting to see some reported changes in the spectral signatures of accretion. Looking forward to the eruption.
Fingers crossed for clear skies for all.
Tautenburger Astronomen melden "signifikante Änderungen im Spektrum von #TCrB. Die Emissionslinien im Spektrum sind sprunghaft angestiegen, was auf eine stark erhöhte Akkretionsrate hindeutet. Des Weiteren sind nun Emissionslinien zu sehen, die nur bei einer Temperatur von mindestens 40000 K entstehen können. [...] Dies könnten erste Anzeichen sein, dass die Nova in Kürze ausbrechen wird": https://www.tls-tautenburg.de/de/news/tautenburger-wissenschaftler-beobachten-auffaellige-veraenderung-im-spektrum-der-wiederkehrenden-nova-t-crb-und-bleiben-wachsam -> https://www.facebook.com/Cunolanghaar/posts/pfbid02SyQfQMGUdbYwiZim6ZETGu3Lhhcs9d7BvfYHkmwpdPoiRrHpw6tW7kxK7Pnv111El und https://www.astronomerstelegram.org/?read=17030
Pre-Outburst Observations of #TCrB with a Smart Telescope: https://iopscience.iop.org/article/10.3847/2515-5172/ad9fea -> "From 2024 April 2 to November 7, we obtained, through two Seestar S50 smart-telescopes, 8060 unfiltered photometric points. It was thus possible to calculate the orbital period of the binary system found to be 226.1 ± 3.8 days, lower than the officially recognized 227.5687 ± 0.0099 days but within the error bar. No outbursts were observed during this observation period."