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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17806, 17807
Message-Id: <20260520070457.667762880487@server.astronomerstelegram.org>
Date: Wed, 20 May 2026 03:04:57 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17806							     ATEL #17806

Title:	Correction to ATel 17805
Author:	M. Dennefeld
Queries:	dennefel@iap.fr
Posted:	19 May 2026; 09:32 UT
Subjects:Optical, Nova

The spectra presented in ATel 17805 concern the Nova AT2026 lck, and not
clk...Sorry for the typo and thanks to Pierre Jean for spotting it.

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ATEL #17807							     ATEL #17807

Title:	Discovery of a Probable Nova in M81, M81N 2026-05a
Author:	K. Hornoch, H. Kucakova (Ondrejov), A. W. Shafter (SDSU)
Queries:	k.hornoch@centrum.cz
Posted:	19 May 2026; 19:27 UT
Subjects:Optical, Nova, Transient

We report the discovery of a probable nova in M81 on a co-added 5280-s
unfiltered CCD frame taken on 2026 May 17.874 UT with the 0.65-m telescope
at Ondrejov. The object is well visible also on a co-added 8100-s unfiltered
CCD frame taken on 2026 May 18.925 UT with the same instrumentation.

The object designated as M81N 2026-05a = PNV J09550289+6902138 is located
at R.A. = 9h55m02s.89, Decl. = +69o02'13".8 (equinox 2000.0), which is
162.4" west and 101.3" south of the center of M81 (see link to discovery
image below).

Here we list the observing dates and corresponding photometry:

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

2026-05-08.856 | >21.0  |      | C       | OND 
2026-05-17.874 |  20.7  | 0.15 | C       | OND 
2026-05-18.925 |  20.5  | 0.15 | C       | OND

</span>

As with all extragalactic novae, follow-up spectroscopic and photometric
observations to determine the nova's spectroscopic class and rate of decline
(speed class) are encouraged. The OND 0.65-m is a reflecting telescope
at the Ondrejov observatory operated jointly by the Astronomical Institute
of ASCR and the Astronomical Institute of the Charles University of Prague,
Czech Republic. It uses a Moravian Instruments G2-3200 MkII CCD camera
(with a Kodak KAF-3200ME sensor and standard BVRI photometric filters)
mounted at the prime focus. The unfiltered OND photometry was calibrated
against R-band comparison stars from 
<a href="http://adsabs.harvard.edu/abs/1995AJ....109.1055P">Perelmuter
& Racine (1995)</a>.

Discovery image: http://www.asu.cas.cz/~asteroid/M81N2026-05a.png
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