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After nine months of ups and downs, V1405 Cas has finally broken through the mag 10 barrier – last night (Dec 19) 10.47TG. That’s a 0.7 mag drop in 24h.
Gary
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
According to the Atel link below radio emissions have been detected
According to the Atel link below radio emissions have been detected
This nova is still being observed and still relatively bright at 11th mag. Worth following. What will it do next?
Light curve from the VSS database:Attachments:
Interesting article concerning radio emissions;
https://www.astronomerstelegram.org/?read=15383Munari and Valisa report in a recent ATel that this is a rare neon nova with an overabundance of neon in the ejecta, derived from the white dwarf: https://www.astronomerstelegram.org/?read=15796
This nova, which erupted in March 2021, is still above mag 12.
Nova Cas 2021 is still just above mag 12. Light curve attached. Further observations of its fade are encouraged.
Attachments:
In an ApJ paper on ArXiv, Brad Schaefer analyses available data on V1405 Cas and concludes, among other things, V1405 Cas is not a Type Ia supernova progenitor.
V1405 is still mag ~13 and above quiescence.
Prompted by Jeremy’s post I thought it was about time to take another look at the nova and attempt a low resolution spectrum.
Well it just about worked but at mag 13 in a very crowded star field it’s not ideal for an objective prism. However it does show H alpha and H beta, the bright HeII line at 468nm and the close pair of lines at 529 and 541nm. The last spectrum in the BAA database, which shows the same features, was from December 2025…so I guess mine is better than nothing nine months on…?
The nova is directly below M52 and left of NGC7635 (Bubble nebula) forming a right angle triangle.
Mike.Attachments:
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