Orbital period: 0.376938 d (9.0465 h)
CzeV3217 20210314.4253 <130C Yuji Nakamura
CzeV3217 20210318.4236 96C Yuji Nakamura
2021 03 18.4236 UT
Discovered by Yuji Nakamura, Kameyama, Mie, Japan, on four frames (15-s exp., limiting mag 12.0) taken by 135mm F4.0 lens + CCD. Nothing is visible at this location on the frames taken on 2021 Mar. 14.4253 UT (15-s exp., limiting mag 13.0) by same instrument. The object is located very close to a W UMa-type eclipsing variable star CzeV3217 (Mag. range 14.870 - 14.960 V, AAVSO VSX).
Gaia EDR3 parallax 0.5776 ± 0.0254 mas (distance 1.69 ± 0.07 kpc)
Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) light curve and data:
Confirmation and subsequent spectroscopy, multiband photometry etc. are urgently required.
2021 03 18.68353 UT
The transient is clearly visible on the images obtained with the 0.6m SAI Moscow State University telescope (Kislovodsk, Russia). The transient position 23:24:47.745 +61:11:14.82 +/-0.1" J2000 measured with respect to UCAC3 stars in the field coincides (0.12" distance) with that of CzeV3217. Preliminary photometry: 2459292.18353 9.58 B, 2459292.18381 9.27 V, 2459292.18400 8.78 Rc, assuming B=12.694, V=12.168, Rc=11.808 for the nearby comparison star 3UC 303-171085; the original images may be found at http://scan.sai.msu.ru/~kirx/img/PNVJ23244760+6111140/KGO600mm/ ---- N. Ikonnikova, K. Sokolovsky
AAVSO Alert Notice 735 reports on N Cas 2021 (= PNV J23244760+6111140 = CzeV3217). Please see the notice for details and observing instructions for photometry, visual observations, and spectroscopy.
There are threads for this object under the following forums:
Please subscribe to these threads if you are observing this nova so you can be updated as to its behavior and any observing campaigns on it. Join in the discussion or ask questions there!
Many thanks, and Good observing,
Elizabeth O. Waagen, AAVSO HQ
My observation on 2021 Mar. 20 is shown via the link below. The indicated mag. is only a rough estimate based on comparing N Cas 2021 to HD 220770 also in Cassiopeia. Most likely it is greater than indicated in the picture.