1 June 2021 at 5:36 pm #584280
Couldn’t see it without my 15×70 binoculars, at 22:30ut last night I estimated it was around 7.5, typo error not 5.5 as I previously wrote. Observed it in 31st through haze and it seemed about the same as the previous night. But not the best conditions to observe2 June 2021 at 12:14 pm #584285
I had a quick look last night at around 21:45ut and it seemed around mag7 but sky conditions weren’t that good due to haze. I wonder if that’s it for the second peak and it will fade or even if we will see more peaks, very interesting article in the latest vas circular about it being miss- classified ages ago. Thinking about it how accurate was the position as it’s a crowded star field6 June 2021 at 8:02 pm #584297
Gradual brightening continue. Now brighter than 7.02 July 2021 at 9:33 am #584408
Reasonably clear a few high altitude clouds, hindered by my neighbours washing setting off her security light in a the gentle breeze. So wait 5 minutes until it goes out.
Seems to be fading when compared to the weekend, last night I estimated it at mag7.922 July 2021 at 6:50 pm #584498
Recent brightening trend continues22 July 2021 at 8:29 pm #584499
I’ve had 9 continuous nights of clear skies but last night the transparency was awful, doesn’t look a lot better tonight so far. I hope to follow this one for some time in Binoculars and a 10 inch Newt. Skies around here suffer from a lot of LED street lights.23 July 2021 at 9:13 pm #584502Neil MorrisonParticipant
This morning the BBC Weather reporter was blaming our very poor sky conditions on high altitude smoke from the USA wild fires. For the last two nights ie 21/22 July and 22/23 July the moon has looked as if it was in Eclipse and very few stars dimmer than second Magnitude were visible naked eye. Thunder Storms in Forecast for the next 48 hours .. So not much chance of getting an upto date image of this long lasting Nova.25 July 2021 at 8:59 am #584503john simpsonParticipant
I wondered if there might be evidence of any asymmetry in the nova due to shocks or clumping of fast/slow ejecta and if it might show up in linear polarisation and wavelength dependence. Measurements from 21-22/07/2021 [file attached] don’t seem to show much other than interstellar polarisation characteristic.26 July 2021 at 2:31 pm #584517Stewart John BeanParticipant
I thought I would give this bright nova a try with iTEL 18 (300 mm) in Spain. Even with only a 5 sec exposure the images were saturating. Then all iTEL images are charged as if they were 60 sec exposures – not economical.
So I will stick to fainter objects unless someone can point out a workaround.
Stewart26 July 2021 at 10:52 pm #584519Nick JamesParticipant
Stewart, Yes, it’s back up to 5.6 unfiltered tonight (July 26) which is not far short of its brightest at the previous peak. I’m doing 1s exposures and it is not far off saturating my camera. It is very hazy here but I think I’ll get the binoculars out again.27 July 2021 at 9:54 am #584521Stewart John BeanParticipant
The good news is that iTEL are forgiving of my mistakes in setting up runs. They have refunded my account which I think is very good of them.2 August 2021 at 2:26 pm #584560
seems to be fading quickly, easily visible in my 20×70 binoculars on Wednesday 28th but last night the 1st August I couldn’t see it. Was going to get my telescope out but clouds rolled in just as I set up.7 August 2021 at 11:42 am #584574David BoydParticipant
Here is a spectrum of Nova Cas 2021 taken on 6th August with a LISA (R~1065) and calibrated in absolute flux using a concurrently measured V magnitude of 7.70. There are broad emission lines of H I Balmer and He I, all with P-Cygni absorption dips, and weak Fe II emission lines with double peaks. The H-alpha line is so strong that exposures had to be kept to 40 sec to avoid saturating. Further information about the spectrum and more plots can be found on the ARAS Forum at
David3 September 2021 at 9:58 am #584645
This nova is still showing lots of interesting activity. And it’s still 8th mag24 September 2021 at 4:47 pm #584730
The nova that keeps on giving!24 September 2021 at 5:06 pm #584731
Never ceases to amaze me each night I observe it. I hope it continues for a long time. I hope there will be a paper on what is going on with iy.5 November 2021 at 1:34 pm #584891
This paper on ArXiv today on the light curve of the nova includes spectroscopy from BAA members: https://arxiv.org/abs/2111.024635 November 2021 at 1:52 pm #584892
Interesting paper and it’s good to see the BAA acknowledged, looks like it will keep the professionals busy for a while.6 November 2021 at 1:12 am #584893Robin LeadbeaterParticipant
It is slightly strange that they decided to use a subset of all the available spectra (There are currently 104 in the BAA, 392 in the ARAS and 113 in the AAVSO databases, most of which would meet the resolution criterion though many are likely duplicates) I wonder what the selection criterion was.14 December 2021 at 7:41 pm #585017
Seems V1405 Cas has been detected in X-rays according to the link below.
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