The optical re-brightening of nova M31N 2017-11a

ATel #11095; Zhijian Xu (Nanjing Putian Telecommunications Co,. Ltd.), Xing Gao, Yanxi Li, Jingyuan Zhao, Mi Zhang (Xingming Observatory)
on 27 Dec 2017; 10:35 UT
Credential Certification: Martin Henze (henze@ice.cat)

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We report the initial discovery of the optical re-brightening of the Fe II class nova M31N 2017-11a (AT2017hvi = PTSS-17zap) which was first reported by PMO-Tsinghua Supernova Survey (PTSS, http://www.cneost.org/ptss/ ), (2017, TNS Discovery Report https://wis-tns.weizmann.ac.il/object/2017hvi) at r-Sloan magnitude 18.5 on 2017-11-04 16:41:02 UT. Spectroscopy by Williams & Darnley using the 2-m Liverpool telescope (ATel #10990) on 2017 Nov 20.11 UT, and by Fabrika et al., (ATel #10998) taken two days later at the Russian BTA telescope, showed Balmer emission lines together with numerous strong Fe II lines, confirming its classification as a classical Fe II class nova. Photometry by the Xingming Observatory suggests that the original outburst peaked at an unfiltered magnitude of 17.6 around 2017-11-05.5 UT, and faded to below magnitude 19.5 after 2017-11-24.6 UT. The final re-brightening occurred on 2017-12-15 UT from magnitude 19.0 and brightened to the magnitude ~ 18.4 around 2017-12-23.7 UT. More recent observations give an unfiltered magnitude 18.5 at 2017-12-24.6 UT suggesting that the transient is brightening.

 
NET UCAC-4 
Obs. UT Date               V mag  
C2017 11 05.52715          17.6 V 
C2017 11 06.53872          17.9 V 
C2017 11 07.58881          17.8 V 
C2017 11 09.55113          17.9 V 
C2017 11 11.52507          18.0 V 
C2017 11 12.52819          18.2 V 
C2017 11 13.59027          18.5 V 
C2017 11 14.75596          18.4 V 
C2017 11 22.51223          19.1 V 
C2017 11 23.68586          19.5 V 
C2017 11 24.57595          19.3 V 
C2017 12 15.75442          19.0 V 
C2017 12 16.52421          19.1 V 
C2017 12 17.59486          19.1 V 
C2017 12 18.51319          18.7 V 
C2017 12 21.71678          19.0 V 
C2017 12 23.71288          18.4 V 
C2017 12 24.56763          18.5 V 
C2017 12 24.56821          18.3 V 
C2017 12 24.56878          18.6 V 
C2017 12 24.56936          18.4 V 

Further observations are encouraged.