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Return-Path: <atel@astronomerstelegram.org> Delivered-To: stefano@bicar.it Received: by mail.planetcloud-host.com (Postfix, from userid 99) id 8CC1314601; Fri, 2 Jan 2026 08:07:01 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on mail.planetcloud-host.com X-Spam-Level: X-Spam-Status: No, score=-0.0 required=5.0 tests=RCVD_IN_DNSWL_BLOCKED, RCVD_IN_VALIDITY_RPBL_BLOCKED,RCVD_IN_VALIDITY_SAFE_BLOCKED,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=disabled version=3.4.0 Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=174.142.199.243; helo=server.astronomerstelegram.org; envelope-from=atel@astronomerstelegram.org; receiver=stefano@bicar.it Received: from server.astronomerstelegram.org (astronomerstelegram.org [174.142.199.243]) by mail.planetcloud-host.com (Postfix) with ESMTP id 60614144C4 for <stefano@bicar.it>; Fri, 2 Jan 2026 08:06:19 +0100 (CET) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id A0B4A28808E2 for <stefano@bicar.it>; Fri, 2 Jan 2026 02:06:18 -0500 (EST) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17571 Message-Id: <20260102070618.A0B4A28808E2@server.astronomerstelegram.org> Date: Fri, 2 Jan 2026 02:06:18 -0500 (EST) ------------------------------------------------------------------------------ The Astronomer's Telegram is free to read, free to publish, free to use. Thanks to the support of our patrons, we can continue to keep it free. https://www.patreon.com/astronomerstel ------------------------------------------------------------------------------ The Astronomer's Telegram http://www.astronomerstelegram.org ------------------------------------------------------------------------------ Posted: Within the last 24 hours ============================================================================== ATEL #17571 ATEL #17571 Title: Detection of comet 3I/ATLAS in radio wavelength during closest approach to Earth using uGMRT Author: Arijit Manna (SNBNCBS), Sabyasachi Pal (MCC), Tapas Baug (SNBNCBS) Queries: arijit.manna@bose.res.in Posted: 2 Jan 2026; 05:10 UT Subjects:Radio, Comet The interstellar comet 3I/ATLAS reached its closest approach to Earth on 19th December 2025, at a distance of about 1.8 AU. We conducted low-frequency radio observations of the comet using the upgraded Giant Metrewave Radio Telescope (uGMRT) Band-5 at a central frequency of 1239 MHz on the day of the closest approach and two days before and two days after. The preliminary data analysis suggests the successful detection of comet 3I/ATLAS on 17 and 19 December 2025, with a significance greater than 10σ with flux densities on 17 and 19th December of 3.86 ± 0.38 mJy and 0.81 ± 0.05 mJy, respectively. The comet was not detected on 21 December 2025. We find that comet 3I/ATLAS was significantly bright before its close approach (17 December) and became considerably faint at the closest approach (19 December), followed by a non-detection afterwards (21 December). This study represents a key step toward probing cometary radio emissions at meter wavelengths. The detection confirmed the presence of measurable radio continuum emissions, likely arising from dust-related emissions and/or plasma processes associated with the interactions between the cometary environment and solar wind. Detailed calibration, imaging, time-variability studies, and spectral line analyses, including a search for atomic HI emissions at 1420 MHz, are currently in progress. These analyses will place important constraints on the physical conditions of the cometary coma, including dust content and interaction mechanisms. Further scientific results will be presented in a follow-up publication. We thank the GMRT operations team for scheduling and supporting these observations. The GMRT is operated by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research. The continuum image of 3I/ATLAS observed on 17 December 2025 at a frequency of 1239 MHz is attached at the following link. uGMRT image of comet 3I/ATLAS: https://newweb.bose.res.in/departments/APHEP/images/image.png ------------------------------------------------------------------------------ Password Certification: Arijit Manna (arijit.manna@bose.res.in) https://www.astronomerstelegram.org/?read=17571 ============================================================================== ============================================================================== This is an automatically-generated notice. You can remove yourself permanently from receiving both the Daily Email Digest and Instant Email Notices from The Astronomer's Telegram by following this link: https://www.astronomerstelegram.org?unsubscribe&confirmation=a803d34e7ea924f9a4142bac00763549&address=stefano@bicar.it
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