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Map on the VSS website shows the location of St John’s CP: https://britastro.org/vss/NNHS_carpark_map.gif
An ApJ paper by Brad Schaefer on ArXiv today considers whether T CrB is a Type Ia SN precursor, as has been speculated. He presents evidence that it is not: https://arxiv.org/abs/2510.01587
He gives no revised date for its next eruption other than saying it’s likely in the next months.
In another paper he draws similar conclusions about the RN, U Sco: https://arxiv.org/abs/2510.01589
Just a reminder about this meeting on the History of Astrochemistry on October 16. The registration deadline of October 8 is looming.
An ApJ preprint on ArXiv today on “Elemental and Isotopic Yields from T Coronae Borealis: Predictions and Uncertainties” discusses various models of nucleosynthesis in novae, suggesting which isotopic observations during its next eruption will enable the correct model to be diagnosed.
An ApJL preprint on archive today “JWST detection of a carbon dioxide dominated gas coma surrounding interstellar object 3I/ATLAS”
Says the coma is CO2 dominated, with enhanced outgassing in the sunward direction, and the presence of H2O, CO, OCS, water ice and dust. The coma CO2/H2O mixing ratio is among the highest ever observed in a comet – the authors discuss why this might be the case depending on its origins.
Water detected and possible large icy grains, ApJL preprint: https://arxiv.org/abs/2508.04675
Good to hear you are continuing to monitor T CrB with your Seestar, Heinz-Bernd. As you say, now is not the time to blink!
So when will the eruption occur ? I am very impatient.
Many thanks.Kwong Man
That will be when sufficient matter has accumulated on the surface of the white dwarf to trigger a thermonuclear runaway. Your guess is as good as mine when that will be.
More nice data, Ian. The changes in eclipse width FWHM should reveal the disc shrinking as it cools.
Ulisse Munari et al. have published a pretty comprehensive analysis of T CrB’s accretion history in this Astronomy & Astrophysics preprint:
https://arxiv.org/abs/2507.23323They point out that its superactive phase from 2015 to 2023 was actually not quite as active as the equivalent phase that preceded the 1946 eruption. They note that the increased accretion since May 2024 is making up for this deficit.
Hello John,
I asked Alexander about polarimetry and he says “my quick research shows that no polarimetric monitoring has been done for X Persei in quite a long time (since 1994), at least not in the published literature.”
If he finds more info, he will get back to me.
Go well!
JeremyA chart and sequence for visual observers is here: https://britastro.org/vss/xchartcat/x-per-277.html
An ApJL preprint on ArXiv today presents events for the probable direct imaging of a lower mass companion of Betelgeuse: https://arxiv.org/abs/2507.15749
There is an interesting paper on ArXiv today that looks at the effect of geomagnetic activity in the re-entry of Starlink satellites, especially during the rising phase of Cycle 25: https://arxiv.org/abs/2505.13752
An MNRAS preprint on ArXiv today considers “Near-Infrared Spectroscopy of the Recurrent Nova M31N 2008-12a” during the 2024 eruption discussed in the thread: https://arxiv.org/abs/2505.10431
