PNV J23244760+6111140: nova eruption of CzeV3217?

Affiliation

Association Francaise des Observateurs d'Etoiles Variables (AFOEV)

Thu, 03/18/2021 - 16:52

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

SPK

Affiliation

Association Francaise des Observateurs d'Etoiles Variables (AFOEV)

Thu, 03/18/2021 - 19:24

Any pre-discovery images?

Please check your recent images of this region in Cassiopeia (0.5° south of the open cluster M52).

SPK

Affiliation

Association Francaise des Observateurs d'Etoiles Variables (AFOEV)

Thu, 03/18/2021 - 19:36

Brightening confirmed

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

weo

Affiliation

American Association of Variable Star Observers (AAVSO)

Fri, 03/19/2021 - 22:34

N Cas 2021 - AAVSO Alert Notice 735

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

Vasu Jagannathan

Affiliation

American Association of Variable Star Observers (AAVSO)

Sun, 03/21/2021 - 08:24

N CAS 2021

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.

https://www.flickr.com/photos/vasu-jagannathan/51057383578/in/datetaken-public/

weo

Affiliation

American Association of Variable Star Observers (AAVSO)

Mon, 05/10/2021 - 21:11

V1405 Cas sudden brightening

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

weo

Affiliation

American Association of Variable Star Observers (AAVSO)

Fri, 07/09/2021 - 22:12

V1405 Cas (N Cas 2021) - keep observing it!

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.