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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17803, 17804
Message-Id: <20260516070525.9C1CF288051F@server.astronomerstelegram.org>
Date: Sat, 16 May 2026 03:05:25 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17803							     ATEL #17803

Title:	Spectroscopic Classification of AT 2026mko with the Lick Shane
		Telescope
Author:	K. W. Davis, R. J. Foley (UCSC)
Queries:	kywdavis@ucsc.edu
Posted:	15 May 2026; 16:55 UT
Subjects:Optical, Supernovae

We report the classification of AT 2026mko from spectroscopic observations
with the Kast spectrograph on the Shane telescope obtained on 2026 May
15 UT. The target was supplied by DCAP (selected from the ZTF data stream).
Follow-up was coordinated using the target management platform YSE-PZ (Coulter
et al., 2023, PASP, 135, 4501). The classification was performed with SNID
(Blondin & Tonry, 2007, ApJ, 666, 1024).

Name      | IAU Name   | RA (J2000)   | Dec (J2000)  |   z   | Type   |
Phase | Notes 
DCAP77    | AT2026mko  | 15:46:22.344 | -09:34:29.27 | 0.08  | SN Ia  |
-8   |

Notes: 
When the redshift is given to 2 decimal places, it is derived from the
SN spectrum. Otherwise, the redshift is determined from the host galaxy.

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Password Certification: Ryan Foley (foley@ucsc.edu)
https://www.astronomerstelegram.org/?read=17803
==============================================================================
ATEL #17804							     ATEL #17804

Title:	Identification and spectroscopic classification of a reddened
		classical nova AT2026ldc with strong CO emission
Author:	Viraj Karambelkar (Columbia University), Danielle Frostig
		(CfA), Kishalay De (Columbia), Tanishk Mohan (IIT Bombay) and the
		WINTER collaboration.
Queries:	vk2588@columbia.edu
Posted:	15 May 2026; 18:04 UT
Subjects:Infra-Red, Optical, Nova

We report the identification and spectroscopic observations of a bright
optical and near-IR (NIR) transient found in the regular survey operations
of the the Zwicky Transient Facility (ZTF, Bellm et al. 2018) and followed
up with the Wide-field Infrared Transient Explorer (WINTER, Lourie et al.
2020, Frostig et al. 2024). The source has also been independently discovered
and reported to the Transient Name Server by the DCAP Team with ZTF data
as AT2026ldc / ZTF26aaunaud.

We flagged this source, ZTF26aaunaud, in a dedicated search for large amplitude
Galactic outbursts in ZTF data, with magnitudes of r=16.7+/- 0.02 , i=13.8
+/- 0.01, and g > 20.2 mag on UT 2026-05-12. We subsequently obtained J-band
observations with the WINTER telescope on UT 2026-05-12. The source was
detected with a J-band magnitude of 11.2 +/- 0.1 (AB), and assigned the
name WNTR26bjnyb. The coordinates of the source are 
RA = 18:29:31.90  
Dec = -10:55:31.26

We obtained a NIR spectrum of this source with the SpeX spectrograph on
the NASA Infrared Telescope Facility (IRTF) on UT 2025-05-12. Our spectrum
shows strong, broad (>500 km/s) emission lines, including of H, He, C,
O, with the He lines exhibiting P-cygni profiles, resembling those seen
in classical novae.

We also detect strong CO emission bands, similar to that seen in the Nova
Ophiuchus 2017 (Vishal et al. 2017).

Further observations are encouraged.

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Password Certification: Viraj Karambelkar (vk2588@columbia.edu)
https://www.astronomerstelegram.org/?read=17804
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