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Anyone who would like to image and, especially, to measure a variable star in an external galaxy should pay attention to this announcement made only a few hours ago. If you follow the link you will discover that the discovery was made with a 23cm aperture telescope, something well within the range of equipment used by many BAA members.
Dear colleagues,
The 2025 eruption has been discovered. Please try to increase your observing cadence to monitor the light curve.
The nova was discovered on Nov. 30.3634 with a magnitude of 18.7 by Koichi Itagaki as reported on TOCP page below:http://www.cbat.eps.harvard.edu/unconf/followups/J00452879+4154101.html
Best regards,
Hiroyuki Naito, Nayoro ObservatoryM31N 2008-12a erupts annually and has by far the shortest period known for a recurrent nova. By comparison T CrB, for which everyone seems to be waiting, has a period at least 80 times longer.
Paul
I’ve been away so I haven’t had a chance to do my nightly M31 patrols. I did get the 2023 eruption just after it was discovered though:
https://britastro.org/forums/topic/m31n-2008-12a-call-to-arms
so it is definitely available to small telescopes although it does fade very quickly. I’m back home now and it is clear here at the moment.
Here’s an image just taken from Chelmsford. It shows the nova at 18.3 unfiltered (ref Gaia G) in the blue circle.
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