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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17228
Message-Id: <20250615070544.598EB28807DE@server.astronomerstelegram.org>
Date: Sun, 15 Jun 2025 03:05:44 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17228							     ATEL #17228

Title:	Spectroscopic Classification of ASASSN-25cm (=AT 2025nlr) as
		a Classical Nova
Author:	Yusuke Tampo (South African Astronomical Observatory, University
		of Cape Town)
Queries:	yusuke@saao.ac.za
Posted:	14 Jun 2025; 18:26 UT
Subjects:Optical, Binary, Cataclysmic Variable, Nova, Transient, Variables

I report the spectroscopic classification of <a href="https://www.wis-tns.org/object/2025nlr">ASASSN-25cm</a>
(=AT 2025nlr). Its optical spectrum was obtained on 2025-06-14.745 UT by
the Mookodi (<a href="https://ui.adsabs.harvard.edu/abs/2024JATIS..10b5005E/abstract">Erasmus
et al. 2024</a>) mounted on the 1-m Lesedi telescope at the South African
Astronomical Observatory in Sutherland. The observation setups were 2"
slit, wavelength coverage 4000-8000&#8491;, and spectral resolution R~400.

As reported to <a href="https://www.wis-tns.org/object/2025nlr">TNS</a>,
ASASSN-25cm was originally discovered by ASAS-SN on 2025-06-12 20:52:48
UT at g=8.7 mag. There is no counterpart in archival photometric surveys.

<a href="http://www.kusastro.kyoto-u.ac.jp/~tampo/atel/ASASSN-25cm.250614.pdf">My
normalized spectrum</a> shows the Balmer and either He I or Fe II lines
with P Cygni profiles. 
The absorption minimum of the P Cygni profile in H&alpha; and H&beta; are
located around -1200 and -900 km/s, respectively. 
Combining these spectral features and its large eruption amplitude, I conclude
that this object is a new classical nova.

Mookodi/Lesedi spectrum: http://www.kusastro.kyoto-u.ac.jp/~tampo/atel/ASASSN-25cm.250614.pdf
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