CzeV3217 (EW)
Orbital period: 0.376938 d (9.0465 h)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=2216132
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).
http://www.cbat.eps.harvard.edu/unconf/followups/J23244760+6111140.html
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:
https://asas-sn.osu.edu/sky-patrol/coordinate/00745124-4307-4bd9-9d95-d59d5399975e
Confirmation and subsequent spectroscopy, multiband photometry etc. are urgently required.
Clear skies,
Patrick
Please check your recent images of this region in Cassiopeia (0.5° south of the open cluster M52).
On March 17 at 03:36 UT I imaged rho Cas with a camera lens 1:2.8 f=50mm with 13second exposures. Faintest star visible on the images is 11.3mag on chart X26378XY. The Nova is not visible.
Best regards
Wolfgang Vollmann (VOL)
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
http://www.cbat.eps.harvard.edu/unconf/followups/J23244760+6111140.html
See Astronomer's Telegram 14471:
http://www.astronomerstelegram.org/?read=14471
Nova Cas 2021 20210319.4949UT 7.97V FRF -- preliminary photometry based on my 30s CCD image made using a 25cm iTelescope.net reflector (T5) at Mayhill, New Mexico, US.
https://pbs.twimg.com/media/Ew2GyJHWUAgSIay?format=jpg
https://twitter.com/fidusz/status/1372902071213690880
I made 2-2x30s BVI images + 2x2x10s BIV images. I hope can do proper photometry soon.
Clear skies,
Robert
N Cas 2021 2021 Mar. 19.45440 7.93 TG +/- 0.06
Observer: Filipp Romanov.
Location: Yuzhno-Morskoy (near Nakhodka), Russia.
Photo: https://www.flickr.com/photos/filipp-romanov/51052256002/
Canon EOS 60D, 100mm lens. Stacked 27x10 sec., ISO-6400, f/5.6; little haze.
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:
- Time Sensitive Alerts: https://www.aavso.org/pnv-j232447606111140-nova-eruption-czev3217
- Novae: https://www.aavso.org/pnv-j232447606111140-nova-eruption-czev3217-0
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
Official GCVS name of Nova Cas 2021 : V1405 Cas (CBET 4945)
http://www.cbat.eps.harvard.edu/.../004900/CBET004945.txt
AAVSO Alert Notice 742 reports on the sudden brightening of V1405 Cas (N Cas 2021) that began on May 5. Please see the notice for details and observing instructions.
There are threads for this object under the following forums:
- Time Sensitive Alerts: https://www.aavso.org/pnv-j232447606111140-nova-eruption-czev3217
- Novae: https://www.aavso.org/pnv-j232447606111140-nova-eruption-czev3217-0
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
This morning I observed Nova Cas 2021 with the naked eye. It was easily seen next to the star 4 Cas against the background of the Milky Way.
Location: Yuzhno-Morskoy, near Nakhodka, Russia.
V1405 Cas 2021 May. 10.75000 5.1
With best regards, Filipp Romanov.
The very fast nova V1405 Cas (N Cas 2021) that was discovered in March (AAVSO Alert Notices 735, 742) continues to be bright (V=7.8 as of 2021 July 8) and continues to exhibit intriguing behavior. The light curve below from the AAVSO Light Curve Generator shows the 11,475 observations contributed to date by 210 observers worldwide to the AAVSO International Database.
Please continue your observations of all types as this extremely unusual nova continues to evolve!
Many thanks, and Good observing,
Elizabeth