https://www.astronomerstelegram.org Nova, from The Astronomer's Telegram en-us https://www.astronomerstelegram.org/?read=18103 J. Ricra, C. Avalos-Vega, N. Gomez-Pasten, C. Adam, C. Cardenas, J. P. Colque, and E. Unda-Sanzana J. Ricra, C. Avalos-Vega, N. Gomez-Pasten, C. Adam, C. Cardenas, J. P. Colque, and E. Unda-Sanzana jose.ricra@uamail.cl Credentialed by: Eduardo Unda-Sanzana (eduardo.unda@uantof.cl) The Astronomer's Telegram ATel18103 We report optical photometric observations of SN 2026acxa, obtained on 2026 October 01 UT with the 0.6m telescope at Ckoirama Observatory, Universidad de Antofagasta, Chile. ... 2026-10-13T12:53:15-00:00 https://www.astronomerstelegram.org/?read=18096 A. Evans, D. P. K. Banerjee, T. R. Geballe, C. E. Woodward, S. Starrfield A. Evans, D. P. K. Banerjee, T. R. Geballe, C. E. Woodward, S. Starrfield dpkb12345@gmail.com Credentialed by: Dipankar P.K. Banerjee (dpkb12345@gmail.com) The Astronomer's Telegram ATel18096 The transient AT2026aabo in M31 was discovered on 2026 August 29 at 09:28:57 UT (ATel#18027), and was spectroscopically confirmed as a nova in the FeII phase (ATel#18029). ... 2026-10-08T13:34:15-00:00 https://www.astronomerstelegram.org/?read=18091 K. Hornoch, H. Kucakova, A. W. Shafter K. Hornoch, H. Kucakova, A. W. Shafter k.hornoch@centrum.cz Credentialed by: Allen W. Shafter (ashafter@sdsu.edu) The Astronomer's Telegram ATel18091 We report the independent discovery of a transient found during our survey of the central region of M31. The object was discovered on a co-added 1680-s R-band CMOS frame taken on 2026 Sep. ... 2026-10-05T20:43:09-00:00 https://www.astronomerstelegram.org/?read=18090 Yi-Fei Qu, Rui-Xiang Hu, Bei You, Sai-En Xu, on behalf of the Match team. Yi-Fei Qu, Rui-Xiang Hu, Bei You, Sai-En Xu, on behalf of the Match team. youbei@whu.edu.cn Credentialed by: Bei You (youbei@whu.edu.cn) The Astronomer's Telegram ATel18090 V488 Sge (Nova Sge 2026; PNV J19450648+1822422) was discovered on 2026 Aug 25.1278 UTC (ATel #18009), and was classified as a very fast Fe II-type nova (ATel #18008, #18013). ... 2026-10-05T17:28:45-00:00 https://www.astronomerstelegram.org/?read=18088 Kirill Sokolovsky, Justin Linford, Laura Chomiuk, Peter Craig, Katie Barnhart, Darien Perla, Pragati Acharya, John Worley, Anthony Pearce, Vallia Antoniou, Elias Aydi, Jennifer Sokoloski, Koji Mukai Kirill Sokolovsky, Justin Linford, Laura Chomiuk, Peter Craig, Katie Barnhart, Darien Perla, Pragati Acharya, John Worley, Anthony Pearce, Vallia Antoniou, Elias Aydi, Jennifer Sokoloski, Koji Mukai kirx@kirx.net Credentialed by: Kirill Sokolovsky (kirx@scan.sai.msu.ru) The Astronomer's Telegram ATel18088 Peaking at visual magnitude 7 around 2026-08-25.9 UT and being (so far) the brightest classical nova of the year, Nova Sagittae 2026 (V488 Sge, PNV J19450648+1822422) has been the target of optical photometric and spectroscopic (CBET #5729, ATel #18008, #18009, #18012, #18014, #18021, #18022, #18033, #18053) as well as X-ray observations (ATel #18028, #18084). ... 2026-10-03T19:36:11-00:00 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=18084 K. L. Page and G. J. M. Luna K. L. Page and G. J. M. Luna kpa@star.le.ac.uk Credentialed by: Kim Page (kpa@star.le.ac.uk) The Astronomer's Telegram ATel18084 V488 Sge (Nova Sagittae 2026) was discovered on 2026 Aug. 25.1278 UTC, and classified as a classical Fe II-type nova (CBET #5729, ATel #18009, #18008, ,#18012, #18014, #18021, #18022, #18033, #18053). ... 2026-10-01T19:09:38-00:00 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=18074 R. Kaur, R. J. Foley, K. C. Patra R. Kaur, R. J. Foley, K. C. Patra ravkaur@ucsc.edu Credentialed by: Ravjit Kaur (ravkaur@ucsc.edu) The Astronomer's Telegram ATel18074 We report the classifications of astrophysical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope obtained on 2026 September 21 UT. ... 2026-09-23T00:08:26-00:00