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Updated light curve until end 2021. Currently ca mag 15.5, some 4.5 mags above quiescence and worth following
Here is the complete light curve of V1405 Cas from its discovery on March 18 until today. What a fascinating nova! And it’s still worth following
I can’t believe it’s 2 years since the great dimming of Betelgeuse. The latest light curve was shown in the recent Christmas Meeting Sky Notes by Nick James. There have been a couple of conferences dedicated to Betelgeuse in the last year. Here is a nice paper on “The curious case of Betelgeuse”, by Jacco van Loon (Keele U.) posted in ArXiv today.
I have the printed Journal for a few reasons.
1. I’m far more likely to read it. I have a mixture of other publications in either printed or electronic format. I am far more likely to read a printed edition. I tend to forget about a electronic publication. Or I might read a couple of articles, think I will continue another time, but don’t. It’s much easier for me to pickup and put down a printed edition, leaving it by my favourite chair.
2. I find it difficult to take in detail when I read it from a screen; I also absorb more info in printed format.
3. I much prefer the feel of a printed mag or book
4. Much of my day job is performed on screens. I look for opportunities not to use them when I can
The big advantage of electronic is when I travel. I can read the Journal anywhere on my iPad. But aways have that choice as my non-electronic sub also gives access to the electronic Journal
Observations made last night ~ Nov 29.9 by Tamas Tordai (Hungary) show beautiful ~ 0.1 mg humps, varying between ~12.4-12.5 in V (AAVSO data)
Further info on this transient continues to roll in. Isogai et al. report that the spectrum of this object suggests it is a dwarf nova of the WZ Sge type. They also observed early superhump-like modulations that occur in this type of object. If confirmed this would be the WZ Sge-type dwarf nova having the largest outburst amplitude ever seen.
An ATel by Taguchi et al. (Tokyo U) reports a low res spectrum consistent with a nova, but a UGWZ dwarf nova classification cannot be ruled out at this stage.
More observations needed!
Stewart, you can interrogate the VSX database
You can ask it to return UGSS, or UGER, or whatever you fancy. You can select to get the results returNed sorted by Dec, which will help you to find southerly targets
This recent paper considers the origin of this flaring phenomenon – it’s actually about another nova, but they generalise to all of these slow, dusty systems. However, they state that it’s still an open question -and there may be multiple scenarios in different systems. They favour multiple episodes of mass ejection. They propose that the photosphere expands during a flare – the flares produce shocks which lead to high energy gamma-rays and dust production, others due to instabilities in the accretion disc around the white dwarf created by enhanced accretion stimulated by heating from the secondary star.
The authors of that paper (which include amateurs) make plea for further studies of other novae, so it is good that you and others are following this nova.
