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From: atel@astronomerstelegram.org
Subject: ATel  17211
Message-Id: <20250530070557.BEB3528808DD@server.astronomerstelegram.org>
Date: Fri, 30 May 2025 03:05:57 -0400 (EDT)

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ATEL #17211							     ATEL #17211

Title:	ASASSN-25cd: A Deep, Ongoing, Dipping Event
Author:	B. JoHantgen, D. M. Rowan, K. Z. Stanek, C. S. Kochanek, J.
		Callahan, S. A. Petz (OSU), B. J. Shappee (Univ. of Hawaii)
Queries:	stanek.32@osu.edu
Posted:	29 May 2025; 16:21 UT
Subjects:Optical, Variables

Using data from the All-Sky Automated Survey for SuperNovae (ASAS-SN, <a
href=https://ui.adsabs.harvard.edu/abs/2014ApJ...788...48S/abstract>Shappee
et al. 2014,</A> <a href=https://ui.adsabs.harvard.edu/abs/2017PASP..129j4502K/abstract>Kochanek
et al. 2017,</a> <a href=https://ui.adsabs.harvard.edu/abs/2023arXiv230403791H/abstract>Hart
et al. 2023 </a>), we identified a star with a deep, ongoing, dimming event.
<a href=https://asas-sn.osu.edu/sky-patrol/coordinate/f3db94f3-8e9c-42be-983f-5b3a5328d284>ASASSN-25cd</A>
(RA = 18h31m52.78s, DEC = -28d48m27.14s, d ~ 2.1 kpc, G = 12.7, BP = 13.4,
RP =11.9, DR3 source_id = 4048495409401002368) is a red giant star, likely
a red clump star with a Gaia DR3 (<a href=https://ui.adsabs.harvard.edu/abs/2023A%26A...674A...1G/abstract>Gaia
Collaboration et al. 2023 </a>) extinction-corrected absolute magnitude
M_G = 0.46 mag and color G<sub>BP</sub>&nbsp;-G<sub>RP</sub> = 1.11 mag.

This star was first observed by ASAS-SN on UT 2016-03-14 and it has roughly
~ 4,000 data points at this time. It had a mean g-magnitude of ~13.7 (V
~ 13.1) and no <a href=https://asas-sn.osu.edu/sky-patrol/coordinate/dbef652a-5004-42a5-bba2-67f30a03b714>previous
variability</A>. The dimming event began around UT 2025-03-30. The star
has faded by about 1.7 mag in the g-band and continues to fade by approximately
0.5 mag/month.

We thank Las Cumbres Observatory and its staff for their continued support
of ASAS-SN. ASAS-SN operations are funded in part by the Gordon and Betty
Moore Foundation through grants GBMF5490 and GBMF10501 to the Ohio State
University, and Alfred P. Sloan Foundation grant G-2021-14192.

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