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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17857
Message-Id: <20260629070251.C26AE28807C4@server.astronomerstelegram.org>
Date: Mon, 29 Jun 2026 03:02:51 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17857							     ATEL #17857

Title:	Discovery of an Apparent Nova Positionally Coincident with
		G170 in M31, M31N 2026-06c
Author:	K. Hornoch, H. Kucakova (Ondrejov), A. W. Shafter (SDSU)
Queries:	k.hornoch@centrum.cz
Posted:	28 Jun 2026; 11:34 UT
Subjects:Optical, Nova, Transient

We report the discovery of an apparent nova found during our survey of
the central region of M31. The object was discovered on a co-added 1800-s
H_alpha CMOS frame taken on 2026 Jun. 26.059 UT with the 0.65-m telescope
at Ondrejov. Subsequently, we found a prediscovery detection of the new
object on a co-added R-band 600-s CCD frame taken on Jun. 13.442 UT with
the Danish 1.54-m telescope at La Silla.

The object was designated as M31N 2026-06c = PNV J00423204+4110283 and
is located at R.A. = 0h42m32s.04, Decl. = +41o10'28".3 (equinox 2000.0),
which is 138.6" west and 340.2" south of the center of M31 (see link to
discovery image below).

The nova is positionally coincident with a metal-rich globular cluster
G170 (see the discovery and comparison image below) and looks as apparent
"elongation" of the globular cluster (GC) in WNW direction. Up to now,
only a few novae spatially coincident with a GC was discovered in M31 making
this nova potentially interesting.

The following magnitudes were obtained using the 0.65-m telescope (D65)
and the Danish 1.54-m telescope (DK154):

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

2026-06-04.036 | >17.8  |      | H_alpha | D65 
2026-06-13.442 |  17.8  | 0.2  | R       | DK154 
2026-06-26.059 |  16.6  | 0.3  | H_alpha | D65 
2026-06-26.957 | >19.1  |      | R       | D65 
2026-06-27.009 |  17.3  | 0.3  | H_alpha | D65

</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. This work is based
(in part) on data collected with the Danish 1.54-m telescope at the ESO
La Silla Observatory.

Discovery and comparison image: top left pre-outburst H_alpha; top right
discovery H_alpha; bottom left pre-outburst R-band; bottom right prediscovery
R-band: http://www.asu.cas.cz/~asteroid/PNVJ00423204+4110283.png
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Password Certification: Allen W. Shafter (ashafter@sdsu.edu)
https://www.astronomerstelegram.org/?read=17857
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