Nova Cassiopeiae 2020 = TCP J00114297+6611190 (N)
Coordinates (J2000.0): R.A. 00 11 42.96 Decl. +66 11 20.8
Discoverers: Stanislav Korotkij and Kirill Sokolovskij
Further spectroscopy and multiband photometry are encouraged.
Did you still take the data from visual observers in your system ?
Or maybe it's because my "Comment code" was "U", because I don't see my early observations of this nova in your report ?
Could you clarify, just let me know, I don't need any correction ...
Thank you for your help anyway
The V-band data shows an initial peak around JD 2459072, then a decline for about five days, and then a second small rise for another four days. It may have started to decline again -- the data isn't clear yet.
This seems a bit unusual for a nova, but I don't deal with them very often. Would an expert care to comment?
Central Bureau for Astronomical Telegrams Electronic Telegram No. 4842 (behind paywall): http://www.cbat.eps.harvard.edu/iau/cbet/004800/CBET004842.txt
I have a few nights time series of Nova Cas: 12"F4 newton, Atik314L+ and johnson-V filter (made by Baader). Baader photometric v-filter have some difficulties in the case of Nova observations, leaking Ha, as it came out in case of Nova Del 2013: https://www.aavso.org/comment/33154#comment-33154
And this nova is not different, it has quite big Ha spike: http://www.spectro-aras.com/forum/viewtopic.php?f=36&t=2591&start=30#p1…; So my data is a little brighter than it should be. I'm sorry about that.
i like time series and always look to see if there are any possible unknown variables, and yes, this time it looks like there is four candidate (AAVSO chart X25611AGR, FOW = 30'):
1:Comp. star 126 (USNO-A2 1500-00215803) Mean amplitude 0.013mag, period 2.49h
2:USNO-A2 1500-00239533 (near by "companion" of comp. star 130) Mean amplitude 0.018mag, period 2.45h
3:USNO-A2 1500-00257228 Mean amplitude 0.007mag, period 1.92h
4: Comp.star 112 (TYC 4026-29-1) seems to have mean amplitude 0.015mag, and period some 4.8d - too little data yet to make accurate determination.
i think those potential variables (comp.star 112 in particular) change so little that they have no effect on the Nova measurement results, the covered the measurement noise. Much more of my measurements are distorted by the Baader filter - should get a better filter.
Your findings about comp stars (I use 126 as comp and 112 as ckeck) could explain a fluctuations in my check star (112) from night to night relative to 126!
I also use Baader V filer so probably this causes that my last observations look brighter than others...
Does the relative intensity of Halpha evolve? The observations I made couple weeks ago look more consistent with others...
"Does the relative intensity of Halpha evolve? " Yes,looks like it.
spectro-aras.com/ Christophe Boussin: "Halpha line whose relative intensity seems to increase.."
There is a kind of oscillation with 8 days period visible.
Based on the classificationschem from Strope, Shaefer, Henden (The Astronomical Journal, 140:34-62, 2010) this could fit into several classes like J, O., but I find it difficult to decide. For O class, the oscillations start early and for J they seem to be too regular.
Any ideas? Does anyone know more about the origin of those oscillations? Repeating thermonuclear events of pulsation driven or...?