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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 2861914C2C; Thu, 9 Oct 2025 09:14:04 +0200 (CEST) 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 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 11C351458F for <stefano@bicar.it>; Thu, 9 Oct 2025 09:14:00 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 006182880801 for <stefano@bicar.it>; Thu, 9 Oct 2025 03:14:00 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17437, 17438 Message-Id: <20251009071400.006182880801@server.astronomerstelegram.org> Date: Thu, 9 Oct 2025 03:14:00 -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 #17437 ATEL #17437 Title: Periodic changes in positional observations of comet 3I/ATLAS (C/2025 N1) Author: Yuri Medvedev (IAA RAS), Sergei Pavlov (IAA RAS) Queries: medvedev@iaaras.ru Posted: 8 Oct 2025; 10:35 UT Subjects:Comet We report the results of the analysis of the O-C distribution of positional observations (Δα, Δδ) for the interstellar comet 3I/ATLAS (C/2025 N1) taken from MPC. A Lomb-Scargle periodogram was constructed based on the O-C values obtained for the moments when the comet's heliocentric distance became less than 4 AU. It was found that the (Δα·cosδ)<sup>2</sup>+Δδ<sup>2</sup> values undergo variations with a statistically significant period of 4 hours. We also constructed a periodogram for 19 photometric observations obtained between July 4 and 6 (60860.9796 - 60862.1202 mjd) from the paper <a href="https://arxiv.org/abs/2509.05562"> John L. Tonry et al. (2025)</a>.Values with the maximum aperture (m14) were used. The identified period coincided with the O-C period and is equal to 4 hours. ------------------------------------------------------------------------------ Password Certification: Yuri Medvedev (medvedev@iaaras.ru) https://www.astronomerstelegram.org/?read=17437 ============================================================================== ATEL #17438 ATEL #17438 Title: Correction to ATel #17437 Author: Yuri Medvedev (IAA RAS), Sergei Pavlov (IAA RAS) Queries: medvedev@iaaras.ru Posted: 8 Oct 2025; 16:20 UT Subjects:A Comment It was found that the power spectrum of the time series of O-C values has a pronounced peak at a period of 4 ± 2 hours, where the error was obtained by the bootstrap method, and the power spectrum of the light curve has a peak at a period of 2 ± 1.33 hours, which corresponds to the half-period of the O-C series. Periodic changes in positional observations of comet 3I/ATLAS (C/2025 N1): https://www.astronomerstelegram.org/?read=17437 ------------------------------------------------------------------------------ Password Certification: Yuri Medvedev (medvedev@iaaras.ru) https://www.astronomerstelegram.org/?read=17438 ============================================================================== ============================================================================== 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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