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Name
  V1405 Cas  
AAVSO UID
000-BNX-642 (67529 observations)  
Constellation
Cassiopeia Sequence
J2000.0
23 24 47.73 +61 11 14.8  (351.19887 +61.18744) Search nearby
B1950.0 23 22 33.07 +60 54 45.1
Galactic coord. 112.685 +0.051
Other names

(Internal only)
2MASS J23244772+6111149 CzeV3217 GALEX J232447.6+611114
Gaia21bpe IPHAS J232447.74+611114.7 N Cas 2021
Nova Cas 2021 Nova Cassiopeiae 2021 PNV J23244760+6111140
TIC 269819908 UCAC4 756-077930 URAT1 756-382411
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Variability type
NB:
Spectral type --
Mag. range
5.2 - 15.6 V
Discoverer Zbyněk Henzl
Epoch
10 Jan 2020 (HJD 2458859.0688) Ephemeris
Outburst 2021
Period 0.1883907 d  (4.52138 h)
Rise/eclipse dur. --
Remarks
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1 Otero, Sebastian Alberto Eruption peak epoch 2459346 (from AAVSO data).
2 Schmeer, Patrick A spectrum obtained on 2021 May 8.094 UT is now finally looking as a textbook example for a Fe II nova around maximum brightness (2021ATel14614....1M).
3 Schaefer, Brad TESS pre-eruption light curve (from Sectors 17, 18, and 24) shows the precursor to have a sinewave with flickering (as normal for a cataclysmic variable with irradiation effects). Epoch in the table is for the minimum of the pre-eruption orbital cycle.
4 Schmeer, Patrick Galactic classical He/N nova (2021ATel14478....1T)
5 Otero, Sebastian Alberto VSP Note: 16.8 mag. star 4" to the E, 17.4 mag. star 6" to the E and 16.7 mag. star 10" to the W.
6 Schmeer, Patrick Prior to the eruption that was first detected on 2021 March 18 by Yuji Nakamura, no brightenings had been recorded by the ASAS-SN Sky Patrol since 2014 December 17. Gaia EDR3 parallax 0.578 ± 0.025 mas (distance 1.69 ± 0.07 kpc).
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References
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1 U. Munari; P. Valisa; S. Dallaporta, 2021, ATel #14614 2021ATel14614....1M
2 S. N. Shore; C. Buil; P. Dubovsky; et al., 2021, ATel #14577 2021ATel14577....1S
3 K. Taguchi; K. Isogai; M. Shibata; et al., 2021, ATel #14478 2021ATel14478....1T
4 K. Taguchi; H. Maehara; K. Isogai; et al., 2021, ATel #14472 2021ATel14472....1T
5 H. Maehara; K. Taguchi; Y. Tampo; et al., 2021, ATel #14471 2021ATel14471....1M
6 Gaia Alerts, 2021 (online data) --
7 Naito, S.; et al., 2021, CBET #4945 --
8 T. Vanmunster, 2021, vsnet-alert #25560 --
9 CBAT "Transient Object Followup Reports", 2021 (online data) --
10 CzeV - The Czech Variable Star Catalogue, 2020, online data --
11 Kochanek, C. S.; et al., 2017, The All-Sky Automated Survey for Supernovae
(ASAS-SN) Light Curve Server v1.0		 2017PASP..129j4502K
12 Ricker, G. R.; et al., 2014, Transiting Exoplanet Survey Satellite (TESS) 2014SPIE.9143E..20R
External Links
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Images
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Supporting Documents
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1 V1405Cas_TESS_VSXupdate.pdf Schaefer, Brad 2021-04-20 15:51 UTC Plot of TESS light curve, fitted ephemeris, and plot of folded light curve
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Revision History
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11 Otero, Sebastian Alberto 2021-05-11 15:36 UTC Maximum magnitude from AAVSO data.
10 Schmeer, Patrick 2021-05-08 10:24 UTC Nova type (likely a slow nova) from AAVSO data. Maximum magnitude from 2021ATel14614....1M.
9 Schaefer, Brad 2021-04-20 15:51 UTC Type, period, and epoch from TESS data.
8 Schmeer, Patrick 2021-03-31 10:51 UTC Gaia Alerts name and reference added.
7 Taguchi, Kenta 2021-03-26 17:19 UTC Reference added.
6 Schmeer, Patrick 2021-03-21 19:46 UTC Maximum magnitude from AAVSO data.
5 Zhao, Jingyuan 2021-03-19 23:53 UTC Primary name and maximum magnitude from CBET 4945.
4 Otero, Sebastian Alberto 2021-03-19 00:05 UTC Type from 2021ATel14471....1M.
3 Otero, Sebastian Alberto 2021-03-18 20:45 UTC Minimum magnitude derived from Pan-STARRS1, Gaia DR2, ASAS-SN and IPHAS DR2. Maximum magnitude from vsnet-alert 25560.
2 Schmeer, Patrick 2021-03-18 18:57 UTC Type (N:) and maximum magnitude from CBAT "Transient Object Followup Reports". Gaia EDR3 position.
1 Admin, VSX 2021-03-09 18:39 UTC Preserved original object data.

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