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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17830, 17831, 17832
Message-Id: <20260605070838.3941B28807BE@server.astronomerstelegram.org>
Date: Fri,  5 Jun 2026 03:08:38 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17830							     ATEL #17830

Title:	ALMA and MeerKAT detection of radio rebrightening of SN 2007it
Author:	A. Nucara (INAF-IAPS, UniRoma2), Z. J. Smeaton (Western Sydney
		Uni.), A. Simongini (INAF-OAR; UniRoma2), M. Arias (IAA-CSIC), on
		behalf of the RISE collaboration
Queries:	andrea.simongini@inaf.it
Posted:	4 Jun 2026; 14:00 UT
Subjects:Radio, Millimeter, Supernovae

We report radio and millimeter detection of the Type II supernova SN 2007it
in NGC 5530 (distance 12.2 Mpc), obtained as part of the Rebrightening
in Interacting Supernova Emission (RISE) initiative.

Observations with the Atacama Large Millimeter/submillimeter Array (ALMA)
were carried out on 2026 May 16 under Director's Discretionary Time (DDT).
SN 2007it was detected at 40.15 GHz with a flux density of 1.83 +/- 0.15
mJy and 97.49 GHz with a flux density of 1.14 +/- 0.09 mJy.  
Observations with the MeerKAT radio telescope were obtained on 2026 May
2, also under DDT. SN 2007it was detected at 2.6 GHz with a flux density
of 1.02 +/- 0.05 mJy.

These observations demonstrate that SN 2007it remains a luminous radio-to-millimeter
source one month after previous radio detection (F. Acero et al 2026 Res.
Notes AAS 10 103), consistent with ongoing interaction between the supernova
ejecta and shells of circumstellar material.  
Multi-wavelength follow-up observations are ongoing.

This ATel makes use of the following ALMA data: ADS/JAO.ALMA2025.A.00027.T.
ALMA is a partnership of ESO (representing its member states), NSF (USA)
and NINS (Japan), together with NRC (Canada), NSTC and ASIAA (Taiwan),
and KASI (Republic of Korea), in cooperation with the Republic of Chile.
The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ.  
The MeerKAT telescope is operated by the South African Radio Astronomy
Observatory, which is a facility of the National Research Foundation, an
agency of the Department of Science and Innovation.  
We thank the directors of ALMA and MeerKAT for the award of the discretionary
time that led to these observations.

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Password Certification: Andrea Simongini (andrea.simongini@inaf.it)
https://www.astronomerstelegram.org/?read=17830
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ATEL #17831							     ATEL #17831

Title:	A descriptive title
Author:	Federico Manzini (Stazione Astronomica di Sozzago, Italy),
		David Augustin (Anglet, France),  Raoul Behrend (Observatoire de Geneve,
		Switzerland), Costantino Sigismondi (ICRA, Italy),  Virginio Oldani
		(Stazione Astronomica di Sozzago, Italy), Alessandra C. Mura (UniPd,
		INAF-OAPd, Italy),  Paolo Ochner (INAF-OAPd, UniPd, Italy), Andrea
		Farina (UniPd, Italy), Luigi R. Bedin (INAF-OAPd, Italy),  Andrea
		Reguitti (INAF-OAPd, Italy), Mohamed Aboushelib (National Research
		Institute of Astronomy and Geophysics, Egypt)
Queries:	manzini.ff@aruba.it
Posted:	4 Jun 2026; 18:10 UT
Subjects:Optical, Comet

Comet 10P (the second comet discovered by W. Tempel in Milan in 1873),
a short period comet, is  
approaching perihelion on August 2, 2026, at a heliocentric distance of
approximately 1.42 AU  
(JPL/Horizons, https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=10p).

In recent weeks, the comet has shown a marked increase in brightness, accompanied
by the development  
of a diffuse coma  and a dust tail at PA 260°. The nucleus has always
been clearly visible,  
almost point-like and well defined.

We conducted a photometric monitoring campaign on May 17, 2026, with the
0.4-m telescope at the  
Stazione Astronomica di Sozzago, Italy (IAUC-MPC code, A12) and with the
0.35-m telescope at e-EyE  
(Fregenal de la Sierra, Spain). A total of 15 observing sessions were collected
between May 17 and June 1,  
2026. During the first observing sessions, CCD images were taken without
filters to collect as much signal  
as possible from the area surrounding the nucleus, whose magnitude was
initially around 15-16.  
The comet's motion was tracked with differential tracking to maintain a
point-like nucleus. Over two nights,  
up to 5 hours of continuous observation were collected, taking advantage
of the difference in longitude  
between the two observatories.

All observation sessions were then analyzed photometrically after the standard
reduction (bias, dark,  
flat): the comet's color was derived statistically and the choice of comparison
stars was made based on  
Gaia DR3. The photometric readout circle was set to 6 pixels in diameter,
centered on the comet's  
optocenter to minimize the coma interference.  
The light curves for each night (always very sharp) were initially phased
based on the period published in  
2013 (Schleicher et al., AJ, 2013), and subsequently rephased to achieve
1-sigma precision. The final light  
curve is shown in the figure accompanying this ATel. The overall best observed
period solution shows an  
unambiguous synodic period T = 0.37345d +/- 0.00004d, corresponding to
8h57m46s +/- 4s (1 sigma). 
Our observations confirm the presence of a clear variation in light in
the photometry of the nucleus of  
comet Tempel 2; they also confirm the presence of a period close to that
last published, with a possible  
slowdown of 53+/-4 seconds.

Calibration details, figures and captions are available here:: https://web.oapd.inaf.it/bedin/files/PAPERs_eMATERIALs/ATel/10P/
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Password Certification: Andrea Reguitti (andreareguitti@gmail.com)
https://www.astronomerstelegram.org/?read=17831
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ATEL #17832							     ATEL #17832

Title:	Erratum to ATEL #17831: Determination of the rotation period
		of Comet 10P (Tempel)
Author:	Federico Manzini (Stazione Astronomica di Sozzago, Italy),
		David Augustin (Anglet, France),  Raoul Behrend (Observatoire de Geneve,
		Switzerland), Costantino Sigismondi (ICRA, Italy),  Virginio Oldani
		(Stazione Astronomica di Sozzago, Italy), Alessandra C. Mura (UniPd,
		INAF-OAPd, Italy),  Paolo Ochner (INAF-OAPd, UniPd, Italy), Andrea
		Farina (UniPd, Italy), Luigi R. Bedin (INAF-OAPd, Italy),  Andrea
		Reguitti (INAF-OAPd, Italy), Mohamed Aboushelib (National Research
		Institute of Astronomy and Geophysics, Egypt)
Queries:	manzini.ff@aruba.it
Posted:	4 Jun 2026; 19:29 UT
Subjects:Comet

In ATel #17831, we forgot to report the Telegram Title: Determination of
the rotation period of Comet 10P (Tempel).

We apologize for the inconvenience.

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Password Certification: Andrea Reguitti (andreareguitti@gmail.com)
https://www.astronomerstelegram.org/?read=17832
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