https://www.astronomerstelegram.org Cataclysmic Variable, from The Astronomer's Telegram en-us https://www.astronomerstelegram.org/?read=18087 Thomas M. Gaudin, Jamie A. Kennea, Malcolm J. Coe, Kim L. Page, Itumaleng Monageng, David A. H. Buckley, Phil A. Evans Thomas M. Gaudin, Jamie A. Kennea, Malcolm J. Coe, Kim L. Page, Itumaleng Monageng, David A. H. Buckley, Phil A. Evans tmg6006@psu.edu Credentialed by: Thomas Gaudin (tmg6006@psu.edu) The Astronomer's Telegram ATel18087 An X-ray counterpart to the Small Magellanic Cloud (SMC) nova ASASSN-26dt, also known as AT 2026oyp, has been detected for the first time by an observation of the Swift SMC Survey (S-CUBED). ... 2026-10-03T12:18:25-00:00 https://www.astronomerstelegram.org/?read=18086 N. Masetti, U. Munari N. Masetti, U. Munari nicola.masetti@inaf.it Credentialed by: Nicola Masetti (nicola.masetti@inaf.it) The Astronomer's Telegram ATel18086 Following the announcement in ATel #18083 that the symbiotic star SU Lyn has entered a new phase of high optical activity likely due to enhanced accretion onto the white dwarf hosted in the system, we observed the source in X-rays and ultraviolet (UV) with the Neil Gehrels Swift satellite, starting at 02:17 UT of 2026 October 02. ... 2026-10-02T16:12:23-00:00 https://www.astronomerstelegram.org/?read=18083 U. Munari, P. Valisa, G. L. Righetti, and S. Dallaporta U. Munari, P. Valisa, G. L. Righetti, and S. Dallaporta ulisse.munari@inaf.it Credentialed by: U. Munari (ulisse.munari@oapd.inaf.it) The Astronomer's Telegram ATel18083 The S6,1 red giant SU Lyn was discovered by Mukai et al. (2016, MNRAS 461, L1) to be the counterpart of the unidentified hard X-ray source 4PBC J0642.9+5528 detected during the Swift Burst Alert Telescope (BAT) survey. ... 2026-10-01T10:25:49-00:00 https://www.astronomerstelegram.org/?read=18068 D. Yu. Rusanova, S. Dufoer, A. O. Simon, A. Yu. Korosko, J. K.T. Qvam, S. Kurowski, F.-J. Hambsch, W. Ogloza, N. Karaman, M. Dominik, P. J. Mikolajczyk, L. Wyrzykowski, K. Kotysz D. Yu. Rusanova, S. Dufoer, A. O. Simon, A. Yu. Korosko, J. K.T. Qvam, S. Kurowski, F.-J. Hambsch, W. Ogloza, N. Karaman, M. Dominik, P. J. Mikolajczyk, L. Wyrzykowski, K. Kotysz andrii.o.simon@gmail.com Credentialed by: Andrew Simon (skazhenijandrew@gmail.com) The Astronomer's Telegram ATel18068 Gaia22cax/CSS101127:000130+050624/AT 2020qvd is an SU UMa-type dwarf nova located in the period gap. Kato et al. (2017; doi: 10.1093/pasj/psx058) reported a superhump period of 0.09477(1)d during its 2016 superoutburst. ... 2026-09-21T23:02:55-00:00 https://www.astronomerstelegram.org/?read=18059 D. Yu. Rusanova, A. O. Simon, A. Yu. Korosko, P. J. Mikolajczyk, L. Wyrzykowski, K. Kotysz, V. V. Vasylenko D. Yu. Rusanova, A. O. Simon, A. Yu. Korosko, P. J. Mikolajczyk, L. Wyrzykowski, K. Kotysz, V. V. Vasylenko andrii.o.simon@gmail.com Credentialed by: Andrew Simon (skazhenijandrew@gmail.com) The Astronomer's Telegram ATel18059 The beginning of a new outburst of Gaia20cnt/ASASSN-14fc/AT 2020loj was detected during our monitoring of the object with a Unistellar eVscope (provided by Mike Simmons through the Astronomy for Equity program). ... 2026-09-19T07:45:08-00:00 https://www.astronomerstelegram.org/?read=18056 D. Yu. Rusanova, A. O. Simon, A. Yu. Korosko, P. J. Mikolajczyk, L. Wyrzykowski, K. Kotysz, J. K.T. Qvam, V. Bozza, S. Dufoer, S. Kurowski, V. V. Vasylenko D. Yu. Rusanova, A. O. Simon, A. Yu. Korosko, P. J. Mikolajczyk, L. Wyrzykowski, K. Kotysz, J. K.T. Qvam, V. Bozza, S. Dufoer, S. Kurowski, V. V. Vasylenko andrii.o.simon@gmail.com Credentialed by: Andrew Simon (skazhenijandrew@gmail.com) The Astronomer's Telegram ATel18056 MGAB-V233 is a well-known ER UMa-type dwarf nova characterized by frequent superoutbursts and a short supercycle of approximately 70-90 days. Its superoutbursts typically last about 20-30 days. ... 2026-09-18T21:05:56-00:00 https://www.astronomerstelegram.org/?read=18045 A. O. Simon, D. Yu. Rusanova, W. Ogloza, A. Yu. Korosko, P. J. Mikolajczyk, L. Wyrzykowski, K. Kotysz, O. Witkowska ), K. Siennicki A. O. Simon, D. Yu. Rusanova, W. Ogloza, A. Yu. Korosko, P. J. Mikolajczyk, L. Wyrzykowski, K. Kotysz, O. Witkowska ), K. Siennicki andrii.o.simon@gmail.com Credentialed by: Andrew Simon (skazhenijandrew@gmail.com) The Astronomer's Telegram ATel18045 We identified Gaia16ahk/AT 2016dun as a promising candidate for an SU UMa-type dwarf nova. Consequently, the occurrence of its next superoutburst was predicted by our Outbursts Alerting System. ... 2026-09-15T18:56:08-00:00 https://www.astronomerstelegram.org/?read=18033 M. Mugrauer, L. Maul, and P. Rajkumari M. Mugrauer, L. Maul, and P. Rajkumari markus@astro.uni-jena.de Credentialed by: Markus Mugrauer (markus@astro.uni-jena.de) The Astronomer's Telegram ATel18033 We carried out follow-up imaging and spectroscopic observations of Nova Sagittae 2026 (ATel #18009) on 1 and 2 September 2026 at the University Observatory Jena. ... 2026-09-07T12:42:45-00:00 https://www.astronomerstelegram.org/?read=18014 Gesesew Reta Habtie Gesesew Reta Habtie gesesew@bose.res.in Credentialed by: Gesesew Reta Habtie (gesesew@bose.res.in) The Astronomer's Telegram ATel18014 I report optical spectroscopic observations of the newly discovered nova Nova Sge 2026 (ATel #18009), located at RA (J2000) = 19h 45m 06.48s, Dec (J2000) = +18 & deg; 22 & prime; 42.2 & Prime;. ... 2026-08-27T16:02:53-00:00 https://www.astronomerstelegram.org/?read=18012 Jingyuan Zhao, Jiashuo Zhang, Wang Li, Yaozhang Ou, Ezhar Elijan, Xinyan Chen Jingyuan Zhao, Jiashuo Zhang, Wang Li, Yaozhang Ou, Ezhar Elijan, Xinyan Chen runwuyu20090722@foxmail.com Credentialed by: Kirill Sokolovsky (kirx@scan.sai.msu.ru) The Astronomer's Telegram ATel18012 The NMW-TexasTech survey (Rokinon 135-mm f/2.2 telephoto lens + QHY600PH-M CMOS camera) discovered an optical transient of 9.0 mag in Sagitta on 2026 Aug 25.1278 UTC, and reported it to the CBAT Transient Objects Confirmation Page, where it was designated PNV J19450648+1822422 http://www.cbat.eps.harvard.edu/unconf/followups/J19450648+1822422.html Its possible progenitor star is Gaia DR3 1824166210904571136. ... 2026-08-26T14:28:29-00:00