Pixies Posted June 6, 2021 Share Posted June 6, 2021 Just now, John said: 100mm refractor at 37.5x. The Nova seems to lie somewhere between the stars HD 220057 and HD 220819 in brightness tonight. Those are listed as magnitude 6.9 and 6.6 respectively so I'll go for magnitude 6.75 for the nova Really is starting to pick up again. I should be able to have a quick shot later tonight, if it stays clear. 1 Link to comment Share on other sites More sharing options...
John Posted June 6, 2021 Share Posted June 6, 2021 32 minutes ago, Pixies said: Really is starting to pick up again. I should be able to have a quick shot later tonight, if it stays clear. Fingers crossed for you. It's just clouded over here Link to comment Share on other sites More sharing options...
Pixies Posted June 6, 2021 Share Posted June 6, 2021 21 minutes ago, John said: Fingers crossed for you. It's just clouded over here Cloud-free so far, just not quite dark enough yet 1 Link to comment Share on other sites More sharing options...
Pixies Posted June 7, 2021 Share Posted June 7, 2021 And of course the clouds arrived with the darkness.... 2 Link to comment Share on other sites More sharing options...
Voyager 3 Posted June 7, 2021 Share Posted June 7, 2021 John that's a pretty good jump in brightness from 7.1 to 6.75 ! Link to comment Share on other sites More sharing options...
laudropb Posted June 7, 2021 Share Posted June 7, 2021 Nice steady skies here, but of course not totally dark. Nova still seems to be brightening. I estimated it at 6.7. As and added bonus as I was packing up there was a nice display of noctilucent clouds over the Campsie hills to the NW. Not as bright or extensive as the other night, but still nice to see. 4 Link to comment Share on other sites More sharing options...
JeremyS Posted June 7, 2021 Author Share Posted June 7, 2021 36 minutes ago, laudropb said: Nice steady skies here, but of course not totally dark. Nova still seems to be brightening. I estimated it at 6.7. As and added bonus as I was packing up there was a nice display of noctilucent clouds over the Campsie hills to the NW. Not as bright or extensive as the other night, but still nice to see. Great to hear. I always think it a pity when people stop observing during the lighter nights when there is plenty still to see, as you have demonstrated! 3 Link to comment Share on other sites More sharing options...
Stu Posted June 7, 2021 Share Posted June 7, 2021 1 hour ago, JeremyS said: Great to hear. I always think it a pity when people stop observing during the lighter nights when there is plenty still to see, as you have demonstrated! I agree! 👍 2 Link to comment Share on other sites More sharing options...
Pixies Posted June 7, 2021 Share Posted June 7, 2021 Managed to locate it in the ST80, even though the skies are still quite bright towards the North. I couldn't even see 4-Cas in the finder. With my 30mm Vixen NPL, the limiting magnitude just now was only 8. However, the fewer visible stars actually made it seem easier to estimate the nova's brightness. It's brighter than HD 220057 (mag 6.9) but only slightly dimmer than nearby HD 220*19 (mag 6.6). I'll estimate it at mag 6.7 6 Link to comment Share on other sites More sharing options...
Captain Scarlet Posted June 7, 2021 Share Posted June 7, 2021 (edited) … just going out to have a quick look … Was able to see it easily enough but moving scalloped clouds prevented any comparison with anything nearby. m Edited June 7, 2021 by Captain Magenta 3 Link to comment Share on other sites More sharing options...
John Posted June 8, 2021 Share Posted June 8, 2021 I had a quick look with my 12 inch dobsonian earlier. I'd estimate the same as last night so mag 6.7'ish. 5 Link to comment Share on other sites More sharing options...
IB20 Posted June 8, 2021 Share Posted June 8, 2021 Cassiopeia is in the worst possible direction for my observing and is entirely blocked out for most of the evening, so I’m appreciative of other members’ updates on the nova. 👍🏻 1 1 Link to comment Share on other sites More sharing options...
Captain Scarlet Posted June 8, 2021 Share Posted June 8, 2021 A relatively early night for me tonight, but I thought I’d have a quick look and get a comparison before zzzzz. But at 2245, it was still too bright to really see! I could just about find the Nova, but nowhere near dark enough for anything more. Link to comment Share on other sites More sharing options...
Captain Scarlet Posted June 9, 2021 Share Posted June 9, 2021 About the same to me tonight through my bins just now as HD220102, which is 6.6 M 3 Link to comment Share on other sites More sharing options...
Littleguy80 Posted June 9, 2021 Share Posted June 9, 2021 (edited) Thought I’d add my entry into the nova magnitude estimating game. Looking at it in the dob, it looks a smidge dimmer than HD220819 which SkySafari lists at 6.6. I’ll put my estimate at 6.7. Now I just have to wait for the official number to see if I have a chance of winning a prize Really lovely skies this evening. M52 is a treat in the same FOV. Edited June 9, 2021 by Littleguy80 4 Link to comment Share on other sites More sharing options...
skybadger Posted June 11, 2021 Share Posted June 11, 2021 I've been imaging this nova since the start of may , on as much as a daily basis as I can and then using maxim photometry to determine a photometric time series that both measures and shows the changes. Here's an example image: Where the nova is the bright star in the middle. The image is bias, dark and flat fielded. But my time sequence isnt showing the variations you mention. Anyone familiar with Maxim and photometry ? The star chart and reference table below are form the AAVSO plot generator, cover 2 degrees and down to Mag 14. Nova cas photometry chart.pdf Nova Cas Photometry table.pdf 2 1 Link to comment Share on other sites More sharing options...
Davey-T Posted June 11, 2021 Share Posted June 11, 2021 8 hours ago, skybadger said: Anyone familiar with Maxim and photometry ? Had ago at this but didn't get to the end only actually managed one image of the Cas nova so far. Dave Photometry with MaxIm DL 6 - YouTube Link to comment Share on other sites More sharing options...
John Posted June 11, 2021 Share Posted June 11, 2021 Nova still looks around mag 6.7 tonight with a 100mm refractor at 37.5x under slightly hazy skies. 3 1 Link to comment Share on other sites More sharing options...
Malpi12 Posted June 12, 2021 Share Posted June 12, 2021 (edited) On 11/06/2021 at 10:26, skybadger said: Anyone familiar with Maxim and photometry ? Nova Cas Photometry table.pdf 250.94 kB · 12 downloads Sorry I dont know Maxim so cant help I cant find a cross ref of these AAVSO AUID star names in that pdf, to one of the more usual cats such as HIP, HD and others in Stellarium or CdC. Anyone found one please? Very interesting topic, I've been watching with interest, since I missed the recent outburst (behind a hill behind one of my trees ! ) It has now come into better view so I am waiting patiently for another outburst Edited June 12, 2021 by Malpi12 Link to comment Share on other sites More sharing options...
skybadger Posted June 12, 2021 Share Posted June 12, 2021 https://www.aavso.org/aavso-unique-identifier - I think you need membership Link to comment Share on other sites More sharing options...
Malpi12 Posted June 12, 2021 Share Posted June 12, 2021 (edited) Yes, it looks like members only, I got " Access denied You are not authorized to access this page. " I have identified a few, but a bit of a struggle rotating and stretching their chart to superimpose on Stellarium Edited June 12, 2021 by Malpi12 Link to comment Share on other sites More sharing options...
Malpi12 Posted June 12, 2021 Share Posted June 12, 2021 This should perhaps be in the beginners section because I am learning my DSLR , stacking, and variable star observing all at the same time ! I normally observe visual, but my eyesight is no good any more for estimating magnitudes to better than about 1 ! So it is time to learn new tricks. The first pics are of the Nova Cas from the night of 7/8 July, a stack of 40 2sec exp (with 20 bias, no darks more on that later) on a fixed tripod with a very old 50mm M42 lens. I then converted it to grey scale, pixel-peeped a few stars that I could identify in Stellarium and on aavso and plotted the value of the brightest pixel (not scientific but I was just trying things) against the listed magnitudes, in GNUplot. Fitted a quad function curve to them and popped on the pixel value for the nova. Imagine my surprise when it turned up at about 6.7 !!! Just what you guys were observing !!! I thought I would have to do some converting from dslr response to visual, but just before posting this I found the BAA variable data section in which there are a couple of obs. marked with dslr that are also agreeing with visual reports. On my todo list - sort out how to control the temperature of dark frames to coincide with my lights the ones I collected on the night were all over the place and contributed nothing better than the few bias were able to do Get an eq mount. Oh, and cut down a tree ! lol! 1 Link to comment Share on other sites More sharing options...
John Posted June 12, 2021 Share Posted June 12, 2021 23 hours ago, John said: Nova still looks around mag 6.7 tonight with a 100mm refractor at 37.5x under slightly hazy skies. And again with the 120mm frac at the same magnification tonight. 2 Link to comment Share on other sites More sharing options...
JeremyS Posted June 14, 2021 Author Share Posted June 14, 2021 Looks like it is gradually fading again in last few days: 2 1 Link to comment Share on other sites More sharing options...
Pixies Posted June 16, 2021 Share Posted June 16, 2021 The Nova is Cas is getting jealous! All this attention to some fly-by-night upstart in Hercules who shows off for a day or so then burns out! "Over here - look at me!" 1 3 Link to comment Share on other sites More sharing options...
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