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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 41DED14EBD; Thu, 22 May 2025 09:10:05 +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=7.0 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 0B4D1144C1 for <stefano@bicar.it>; Thu, 22 May 2025 09:10:02 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 81B6528808A7 for <stefano@bicar.it>; Thu, 22 May 2025 03:10:01 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17199, 17200 Message-Id: <20250522071001.81B6528808A7@server.astronomerstelegram.org> Date: Thu, 22 May 2025 03:10:01 -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 #17199 ATEL #17199 Title: Independent Discovery of a Probable Nova in M31 and a Prediscovery Detection of PNV J00424614+4112388 = AT 2025kiq Author: K. Hornoch (Ondrejov), H. Kucakova (Charles University), A. W. Shafter (SDSU) Queries: k.hornoch@centrum.cz Posted: 21 May 2025; 19:30 UT Subjects:Optical, Nova, Transient We report the independent discovery of a probable nova found during our survey of the central region of M31. The object was discovered on a co-added 990-s R-band CCD frame taken on 2025 May 21.028 UT with the 0.65-m telescope. The object was independently discovered on May 20.153 UT by Z. Mai et al. and designated as PNV J00422300+4116197 = AT 2025kvc. The object was designated by us as M31N 2025-05d and is located at R.A. = 0h42m22s.99, Decl. = +41o16'19".5 (equinox 2000.0), which is 240.5" west and 11.0" north of the center of M31 (see link to discovery image below). The following R-band magnitudes were obtained using the 0.65-m telescope at Ondrejov (D65): <span class="inner-pre" style="font-size: 13px"> Date [UT] | Mag | Err | Filter | Telescope 2025-05-14.074 | >19.7 | | R | D65 2025-05-21.028 | 17.3 | 0.1 | R | D65 2025-05-21.070 | 17.4 | 0.1 | R | D65 </span> We also report several prediscovery detections of PNV J00424614+4112388 = AT 2025kiq discovered by J. Zhao et al. on 2025 May 11.160 UT. We detected this probable very slowly evolving Jitter class nova first on Mar. 20.779 UT. The following prediscovery R-band magnitudes were obtained using the 0.65-m telescope at Ondrejov (D65): <span class="inner-pre" style="font-size: 13px"> Date [UT] | Mag | Err | Filter | Telescope 2025-03-04.767 | >20.0 | | R | D65 2025-03-09.771 | >19.9 | | R | D65 2025-03-18.777 | >19.8 | | R | D65 2025-03-20.779 | 19.0 | 0.25 | R | D65 2025-03-27.795 | 17.8 | 0.2 | R | D65 2025-04-21.109 | 18.8 | 0.25 | R | D65 2025-04-30.086 | 18.8 | 0.2 | R | D65 2025-05-07.087 | 17.9 | 0.2 | R | D65 2025-05-09.089 | 18.5 | 0.2 | R | D65 2025-05-10.098 | 17.9 | 0.2 | R | D65 </span> As with all extragalactic novae, follow-up spectroscopic and photometric observations to confirm the nova's nature and determine its spectroscopic class and rate of decline (speed class) are encouraged. Discovery image: http://www.asu.cas.cz/~asteroid/M31N2025-05d.png ------------------------------------------------------------------------------ Password Certification: Allen W. Shafter (ashafter@sdsu.edu) https://www.astronomerstelegram.org/?read=17199 ============================================================================== ATEL #17200 ATEL #17200 Title: CTA 102 shows strongly increasing optical activity again after quiet years Author: C. Lorey, S. Duerr, O. Koppitz, N. Bader, N. Boutter, M. Feige, M. Heemskerk, T. Kaplan, F. Lach, L. Lehmann, G. Rinke, D. Paulini, D. Reinhart, D. Schneider, K. Schoch, J. Seufert, R. Steineke, N. Zottmann (all Hans-Haffner-Sternwarte, Friedrich-Koenig-Gymnasium, Wuerzburg, Germany) K. Mannheim (University of Wurzburg, Germany) D. Elsaesser (TU Dortmund, Germany) Queries: dominik.elsaesser@tu-dortmund.de Posted: 22 May 2025; 06:35 UT Subjects:Optical, AGN The blazar CTA 102, also known as 4C 11.69 or PKS 2230+11, with ICRS coordinates (ep=J2000) RA 22h 32m 36.4089 and Dec +11d 43m 50.90406s and a redshift of z=1.0362 (all data from the astronomical database SIMBAD: http://simbad.u-strasbg.fr/simbad/) shows an exceptionally strong increase in optical brightness to a seven-year high in the last few nights. While this object usually displays a brightness of 16 to 17 magnitudes in the R-band, its R-band brightness recently has increased from 16.7 to 13.8 mag. One of the most impressive events regarding this source was the outburst at the end of 2016 to the beginning of 2017. Across the multi-wavelength range, the object reached unexpected brightness levels, in the optical range, for example, values brighter than 11.5 mag in the R band (see ATel # 9868 with R= 11.32 JD 2457738.33). Numerous Astronomers Telegrams report on observations over a span of about three months. Also in the middle and end of 2017 (ATel # 10292; ATel # 10330; ATel # 10386, ATel # 10560; ATel # 11045; ATel # 11081) and in August 2019 (ATel # 13051; ATel # 13054; ATel # 13056) CTA 102 showed remarkable activity, each detected in different wavebands. Since then, this object remained very quiet until three weeks ago. Since then, its brightness in the R band has increased by 2.8 magnitudes within 19 days. We report the following preliminary R-band magnitudes: JD 2460645.3626 16.066 ± 0.015<br /> JD 2460665.2974 16.336 ± 0.019<br /> JD 2460671.2623 16.133 ± 0.013<br /> JD 2460672.2847 16.022 ± 0.027<br /> JD 2460688.2320 15.507 ± 0.014<br /> JD 2460692.2550 15.824 ± 0.013<br /> JD 2460695.2573 16.155 ± 0.019<br /> JD 2460709.2338 16.700 ± 0.060<br /> JD 2460724.2471 16.272 ± 0.112<br /> JD 2460797.5887 16.671 ± 0.055<br /> JD 2460807.5548 15.648 ± 0.027<br /> JD 2460809.5502 14.890 ± 0.021<br /> JD 2460815.5646 14.655 ± 0.011<br /> JD 2460815.5736 14.635 ± 0.010<br /> JD 2460816.5703 13.838 ± 0.012<br /> The observations were carried out as part of the WEBT collaboration (https://www.oato.inaf.it/blazars/webt). The WEBT photometric sequence for this source can be found at: https://www.oato.inaf.it/blazars/webt/2230114-cta-102/ Our measurements are carried out as part of the long-term AGN monitoring program of the Naturwissenschaftliches Labor fuer Schueler am Friedrich-Koenig-Gymnasium (FKG), the Universitaet Wuerzburg, and TU Dortmund University. The optical data were acquired through a Bessel R filter (Chroma) with a 0.5m CDK-astrograph (PlaneWave) and a Moravian C4-16000EC camera at the school and university observatory Hans-Haffner-Sternwarte in 97265 Hettstadt, Germany (https://schuelerlabor-wuerzburg.de/en/observatory/). Hans-Haffner-Sternwarte: https://schuelerlabor-wuerzburg.de/en/observatory/ ------------------------------------------------------------------------------ Password Certification: Dominik Elsaesser (dominik.elsaesser@tu-dortmund.de) https://www.astronomerstelegram.org/?read=17200 ============================================================================== ============================================================================== 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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