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Return-Path: <atel@astronomerstelegram.org> Delivered-To: stefano@bicar.it Received: by mail.planetcloud-host.com (Postfix, from userid 1016) id B3A8E14C7D; Thu, 16 Oct 2025 09:11:15 +0200 (CEST) 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 436DC146D3 for <stefano@bicar.it>; Thu, 16 Oct 2025 09:11:13 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 7CE032880834 for <stefano@bicar.it>; Thu, 16 Oct 2025 03:11:12 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17445, 17446 Message-Id: <20251016071112.7CE032880834@server.astronomerstelegram.org> Date: Thu, 16 Oct 2025 03:11:12 -0400 (EDT) ------------------------------------------------------------------------------ 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 #17445 ATEL #17445 Title: jet detection on interstellar comet 3I/ATLAS with the Two-meter Twin Telescope Author: M. Serra-Ricart (Light Bridges, IAC, ULL), J. Licandro (IAC, ULL), M. R. Alarcon (IAC, ULL) Queries: miquel@lightbridges.es Posted: 15 Oct 2025; 19:45 UT Subjects:Optical, Comet We report a faint jet detected in deep g-band images of the interstellar comet 3I/ATLAS, also known as C/2025 N1 (ATLAS), obtained with the Two-meter Twin Telescope at Teide Observatory during the night of 2 August 2025 (UT). Between 21:18 and 00:16 UT, a total of 159 individual exposures of 50s each in the g band were acquired and co-added following the apparent motion of the object and centered on the comet optocenter. A Laplace-filtered image of the central coma of 3I/ATLAS, obtained following the method described by Serra-Ricart & Licandro (2015, ApJ, 814, 49), shows a faint jet at a position angle (PA) of 286.9+- 0.9 degrees (purple line), coincident with the broad, sunward-directed plume detected in visible images along PA = 280 +- 10 degrees (ATel #17350). The PA of the detected jet was measured at a projected distance of 6000 km from the comet optocenter (indicated by the red lines). The projected velocity vector of the comet (blue arrow) and the antisolar direction (yellow arrow) are also shown, together with the image orientation and a distance scale. jet image of 3I/ATLAS https://drive.google.com/file/d/1PpZNdfsWIiMvkGME8dCr810xu47ClDQd/view?usp=sharing jet image of 3I/ATLAS: https://drive.google.com/file/d/1PpZNdfsWIiMvkGME8dCr810xu47ClDQd/view?usp=sharing ------------------------------------------------------------------------------ Password Certification: Miquel Serra-Ricart (mserra@iac.es) https://www.astronomerstelegram.org/?read=17445 ============================================================================== ATEL #17446 ATEL #17446 Title: Erratum for Atel #17444 Author: G. J. M. Luna (UNAHUR/CONICET/Argentina), K. L. Page (U. Leicester), K. Sokolovsky (TTU) Queries: juan.luna@unahur.edu.ar Posted: 15 Oct 2025; 20:40 UT Subjects:Ultra-Violet, X-ray, Nova The title of Atel 17444 was missing. The title is "Emergence of super-soft emission from Nova V1935 Cen (PNV J14372177-5847400) detected by Swift/XRT" ------------------------------------------------------------------------------ Password Certification: Gerardo Juan Manuel Luna (juan.luna@unahur.edu.ar) https://www.astronomerstelegram.org/?read=17446 ============================================================================== ============================================================================== 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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