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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17182
Message-Id: <20250514070549.36CFF28807FE@server.astronomerstelegram.org>
Date: Wed, 14 May 2025 03:05:49 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17182							     ATEL #17182

Title:	M31N 2025-02b is a Recurrence of the Newly-Identified Recurrent
		Nova M31N 2001-11a
Author:	A. W. Shafter (SDSU), K. Hornoch (Ondrejov)
Queries:	ashafter@sdsu.edu
Posted:	14 May 2025; 05:49 UT
Subjects:Optical, Nova, Transient

A comparison of the position of M31N 2025-02b (AT2025axv), discovered on
2025 Feb. 05.471 by K. Itagaki, has revealed that it is spatially coincident
within ~1.1 arcsec with the published position of a previously identified
nova, M31N 2001-11a (ShA 67), reported by Alksnis et al. (2008, Astronomy
Letters, 34, 563). A comparison of the published finding charts for the
two novae confirms a spatial coincidence to of order one arcsec. The novae
are located ~18' from the center of M31 (16.9' E and 5.9' N of the nucleus),
making the probability of a chance positional coincidence of two unrelated
novae of order only p ~ 0.0004. Finally, we note that the peak magnitude
reported for M31N 2001-11a (B=17.1) agrees remarkably well with that observed
for M31N 2025-02b (m=17.1, unfiltered). Taken together, the available evidence
strongly supports the conclusion that the latter eruption is a recurrence
of a newly-identified recurrent nova, M31N 2001-11a. This discovery makes
M31N 2001-11a the 22nd known recurrent nova in the Andromeda galaxy.

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