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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17567
Message-Id: <20251231070550.A5F6C28807E5@server.astronomerstelegram.org>
Date: Wed, 31 Dec 2025 02:05:50 -0500 (EST)

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Posted: Within the last 24 hours
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ATEL #17567							     ATEL #17567

Title:	AT 2025ajgh is Likely Not a Nova in M31
Author:	K. Hornoch (Ondrejov), H. Kucakova (Charles University), A.
		W. Shafter (SDSU)
Queries:	k.hornoch@centrum.cz
Posted:	31 Dec 2025; 05:53 UT
Subjects:Optical, Nova, Transient

F. Castellani et al. reported a discovery of a probable nova AT 2025ajgh
discovered on <EM><A HREF="https://www.flickr.com/photos/186131359@N02/55010875275">
a co-added 3600-s unfiltered CCD frame </A></EM> taken on 2025 Dec. 28.765
UT. The new object has R = 18.9 mag (measured on the unfiltered CCD image
using GAIA DR3 catalogue).

We observed the central region of M31 during our survey using the 0.65-m
telescope at Ondrejov on Dec. 28.695 UT (we obtained a co-added 980-s R-band
CCD frame) and did not detect any new object at the position of AT 2025ajgh
down to R = 20.3 mag. After we noticed the discovery report of AT 2025ajgh
we took another set of R-band images with the same instrumentation on 28.964
UT. There is nothing visible on a co-added 490-s R-band CCD frame down
to R = 20.4 mag. To go even deeper, we then co-added both series of our
images (1470-s of total exposure time, see link to the image below) with
the same result - there is nothing visible down to R = 20.6 mag.

Based on the available observations we conclude that the object discovered
by F. Castellani et al. is likely not a nova but probably other type of
variable star, perhaps a foreground red dwarf flare star. Additional observations
at the reported position of this object are encouraged.

R-band image: http://www.asu.cas.cz/~asteroid/no_nova_AT_2025ajgh.png
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