Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PNV J23244760+6111140

PNV J23244760+6111140   2021 03 18.4236*  23 24 47.60 +61 11 14.0   9.6 U             Cas       9 0

2021 03 18.4236

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).

2021 03 18.71

CzeV3217 = Gaia EDR3 2015451512907540480 (RA 23 24 47.730 DE +61 11 14.77, equinox J2000.0, epoch 2016.0; parallax 0.5776 ± 0.0254 mas, distance 1.69 ± 0.07 kpc). Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2021 03 18.75

No (such) brightenings were recorded the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) since 2014 Dec. 17 (latest observation from 2021 Feb. 12.066 UT); complete light curve and data at https://asas-sn.osu.edu/sky-patrol/coordinate/98c98720-4f2e-4c7c-8494-7c2cb2059aed —— Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2021 03 18.68353

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

2021 03 18.70857

The NMW survey photometry (Canon 135mm f/2.0 telephoto lens + ST-8300M CCD; unfiltered with V zero-point): 2021-03-14.71017 2459288.21017 13.53 +/-0.10 (latest pre-discovery observation), 2021-03-18.70857 2459292.20857 9.12 +/-0.01. The images may be found at http://scan.sai.msu.ru/~kirx/img/PNVJ23244760+6111140/NMW/ ---- Stanislav Korotkiy, Kirill Sokolovsky, Olga Smolyankina

2021 03 19.468

Mag.= 7.8, position end figures 47.76, 15".0 observed by T. Noguchi, Katori, Japan, using 0.23-m f/10 Schmidt Cassegrain + unfiltered CCD (KAF-0261E), An image at http://park8.wakwak.com/~ngc/images/PNVinCas_20210319.jpg.

2021 03 19.45440

Follow-up observation: 2459292.9544 JD. Mag.= 7.93 TG +/- 0.06 using Canon EOS 60D camera, focal length 100-mm, f/5.6 (stacked 27x10 sec., ISO-6400). Little haze. Filipp Romanov (Yuzhno-Morskoy, Nakhodka, Russia). My photo: https://www.flickr.com/photos/filipp-romanov/51052256002/

2021 03 19.696

follow-up : mag is +7.49U(Rmag) Comparison star UCAC-4 with 0.36m FLI ML1001E 3sec×283, obs by, Yasuo Sano(Nayoro Hokkaido, Japan) http://sn1997ef.web.fc2.com/sn/nova/2021-tcpj23244760_6111140-nova.html