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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 1E82C14591; Sun, 9 Aug 2026 09:03:27 +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, 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 254471451D for <stefano@bicar.it>; Sun, 9 Aug 2026 09:03:24 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 2DCC62880697 for <stefano@bicar.it>; Sun, 9 Aug 2026 03:03:23 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17950 Message-Id: <20260809070323.2DCC62880697@server.astronomerstelegram.org> Date: Sun, 9 Aug 2026 03:03:23 -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 #17950 ATEL #17950 Title: Spectroscopic classification and BVRI photometry of TCP J05210763+2338194 as a FeII-type nova Author: U. Munari (INAF Padova), P. Valisa and S. Dallaporta (ANS Collaboration) Queries: ulisse.munari@inaf.it Posted: 8 Aug 2026; 08:28 UT Subjects:Optical, Cataclysmic Variable, Nova, Transient The transient TCP J05210763+2338194 was discovered on 2026 Aug 06.4109 UT at unfiltered 11.2 mag (calibrated against V magnitudes of Tycho-2 stars in the field) by the NMW-TexasTech survey. According to ATel #17947, on Aug 7.0451 UT it has been measured at unfiltered 10.5 mag (calibrated against G magnitudes of Gaia stars in the field). No multiband, calibrated photometry or classification spectroscopy is available We have recorded BVRI photometry of TCP J05210763+2338194 on Aug 8.109 UT with ANS Collaboration telescope ID 0310, which, transformed via APASS DR8 to the Landolt (2009) standard system, yields: <center> <table border="1"> <tbody><tr><th>UT</th><th>V</th><th>B-V</th><th>V-R</th><th>V-I</th></tr> <tr><td>2026 Aug 8.109</td><td>10.688</td><td>+0.787</td><td>+0.622</td><td>+1.203</td></tr> </tbody></table> </center> A low-resolution spectrum (3820-9200 Ang, 1.42 Ang/pix) of TCP J05210763+2338194 has been recorded through passing clouds on Aug 8.125 UT with the Varese 0.84m telescope, equipped with a Multi-Mode Spectrograph operated in single dispersion mode. The spectrum is dominated by Balmer, OI and FeII emission lines superimposed on a smooth continuum with weak interstellar absorptions. Balmer lines are characterized by a FWHM=800 km/s emission component and a sharper P-Cyg absorption, blue-shifted by 500 km/s. OI 7772 and 8446 lines are both present in emission, at equal intensity. For OI 7772 the emission component has FWHM=670 km/s and it is flanked by a deep P-Cyg absorption blue-shifted by 440 km/s. FeII emission lines are dominated by multiplet N.42 with a FWHM=670 km/s and no P-Cyg absorption component. HeI 5876 is also probably present in weak emission, flanked by an apparent low-velocity P-Cyg absorption, which is more likely due to superimposed and multi-component NaI of stellar and interstellar origin. The spectrum fits well a standard FeII-type nova, probably caught in the early post-maximum phase. The modest Halpha/Hbeta ratio (6.4), the weakness of interstellar features, and the modest (B-V) color suggest a low reddening affecting this nova located at 7 deg Galactic latitude in the anti-center direction. ------------------------------------------------------------------------------ Password Certification: U. Munari (ulisse.munari@oapd.inaf.it) https://www.astronomerstelegram.org/?read=17950 ============================================================================== ============================================================================== 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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