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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17764, 17765
Message-Id: <20260426070447.868F8288091F@server.astronomerstelegram.org>
Date: Sun, 26 Apr 2026 03:04:47 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17764							     ATEL #17764

Title:	Discovery of an Apparent Nova in M31, M31N 2026-04c
Author:	K. Hornoch (Ondrejov), M. Myslivec (HVBO, Czech Republic),
		H. Kucakova (Ondrejov), A. W. Shafter (SDSU)
Queries:	k.hornoch@centrum.cz
Posted:	25 Apr 2026; 20:29 UT
Subjects:Optical, Nova, Transient

We report the discovery of an apparent nova in M31 on a co-added 5400-s
R-band CMOS frame taken on 2026 Apr. 24.042 UT with the 0.4-m telescope
at Belec nad Orlici. M31 was observed at very low elevation under poor
seeing conditions and cirrus clouds.

The object was designated as M31N 2026-04c = PNV J00425564+4114122 and
is located at R.A. = 0h42m55s.64, Decl. = +41o14'12".2 (equinox 2000.0),
which is 127.6" east and 116.3" south of the center of M31 (see link to
discovery image below).

The following magnitudes were obtained using the 0.4-m telescope (HVBO)
and the 0.65-m telescope at Ondrejov (D65):

<span class="inner-pre" style="font-size: 13px"> 
Date [UT]    |  Mag   | Err  | Filter  | Telescope

2026-04-22.122 | >18.4  |      | R       | D65 
2026-04-24.042 |  16.2  | 0.1  | R       | HVBO 
2026-04-25.058 |  16.0  | 0.2  | Ha      | HVBO

</span>

As with all extragalactic novae, follow-up spectroscopic and photometric
observations to confirm the nova's nature and determine its spectroscopic
class and rate of decline (speed class) are encouraged.

Discovery image: http://www.asu.cas.cz/~asteroid/PNVJ00425564+4114122.png
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Password Certification: Allen W. Shafter (ashafter@sdsu.edu)
https://www.astronomerstelegram.org/?read=17764
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ATEL #17765							     ATEL #17765

Title:	Addendum to ATel #17764: M31N 2026-04c is likely the third
		recurrence of the known recurrent nova M31N 1960-12a
Author:	K. Hornoch (Ondrejov), M. Myslivec (HVBO, Czech Republic),
		H. Kucakova (Ondrejov), A. W. Shafter (SDSU)
Queries:	ashafter@sdsu.edu
Posted:	25 Apr 2026; 21:30 UT
Subjects:Optical, Nova, Transient

Comparison of the position of the newly discovered M31 nova candidate M31N
2026-04c (ATel #17764) with those of previously reported novae in M31 reveals
that 2026-04c is very likely the third reported recurrence (fourth known
eruption) of the recurrent nova M31N 1960-12a. The other two reported recurrences
are M31N 2013-05b and 2019-07a. Based on the last three observed eruptions,
the likely recurrence time is of order 6.5 years. Additional photometric
and spectroscopic observations to characterize the light curve and determine
the spectroscopic type are strongly encouraged.

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https://www.astronomerstelegram.org/?read=17765
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