https://www.astronomerstelegram.org Comet, from The Astronomer's Telegram en-us https://www.astronomerstelegram.org/?read=17841 Bryce Bolin, Ian Wong, Laura-May Abron, Brian Lemaux, Leila Alamos, Matthew Belyakov, Kristin Chiboucas, Erin Figura, Christoffer Fremling, Josef Hanuš, Oleksandra Ivanova, Eunchong Kim, Ludmilla Kolokolova, Jen Miller Bryce Bolin, Ian Wong, Laura-May Abron, Brian Lemaux, Leila Alamos, Matthew Belyakov, Kristin Chiboucas, Erin Figura, Christoffer Fremling, Josef Hanuš, Oleksandra Ivanova, Eunchong Kim, Ludmilla Kolokolova, Jen Miller bolin.astro@gmail.com Credentialed by: Bryce Bolin (bolin.astro@gmail.com) The Astronomer's Telegram ATel17841 We report multi-wavelength imaging and spectroscopic observations of the interstellar comet 3I/ATLAS obtained on 2026 January 20-21 with the Gemini Multi-Object Spectrograph (GMOS) on the Frederick C. ... 2026-06-12T05:44:47-00:00 https://www.astronomerstelegram.org/?read=17838 E. Jehin, J. Manfroid, S. Hmiddouch, K. Aravind E. Jehin, J. Manfroid, S. Hmiddouch, K. Aravind ejehin@uliege.ac.be Credentialed by: Emmanuel Jehin (ejehin@uliege.be) The Astronomer's Telegram ATel17838 The author reports that they obtained, using the TRAPPIST-North (Z53) telescope located in Morocco, observations of comet 220P on the nights of June 4 and 5, a few days after a large outburst of -6 mag was reported (ATEL#17829). ... 2026-06-08T18:55:30-00:00 https://www.astronomerstelegram.org/?read=17832 Federico Manzini, David Augustin, Raoul Behrend, Costantino Sigismondi, Virginio Oldani, Alessandra C. Mura, Paolo Ochner, Andrea Farina, Luigi R. Bedin, Andrea Reguitti, Mohamed Aboushelib Federico Manzini, David Augustin, Raoul Behrend, Costantino Sigismondi, Virginio Oldani, Alessandra C. Mura, Paolo Ochner, Andrea Farina, Luigi R. Bedin, Andrea Reguitti, Mohamed Aboushelib manzini.ff@aruba.it Credentialed by: Andrea Reguitti (andreareguitti@gmail.com) The Astronomer's Telegram ATel17832 In ATel #17831, we forgot to report the Telegram Title: Determination of the rotation period of Comet 10P (Tempel). We apologize for the inconvenience. ... 2026-06-04T19:29:11-00:00 https://www.astronomerstelegram.org/?read=17831 Federico Manzini, David Augustin, Raoul Behrend, Costantino Sigismondi, Virginio Oldani, Alessandra C. Mura, Paolo Ochner, Andrea Farina, Luigi R. Bedin, Andrea Reguitti, Mohamed Aboushelib Federico Manzini, David Augustin, Raoul Behrend, Costantino Sigismondi, Virginio Oldani, Alessandra C. Mura, Paolo Ochner, Andrea Farina, Luigi R. Bedin, Andrea Reguitti, Mohamed Aboushelib manzini.ff@aruba.it Credentialed by: Andrea Reguitti (andreareguitti@gmail.com) The Astronomer's Telegram ATel17831 Comet 10P (the second comet discovered by W. Tempel in Milan in 1873), a short period comet, is approaching perihelion on August 2, 2026, at a heliocentric distance of approximately 1.42 AU (JPL/Horizons, https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=10p). ... 2026-06-04T18:10:35-00:00 https://www.astronomerstelegram.org/?read=17829 Michael S. P. Kelley, Quanzhi Ye, Carrie Holt, Josiah Purdum, Colin Snodgrass, on behalf of the Zwicky Transient Facility Collaboration, and the LCO Outbursting Objects Key Project Michael S. P. Kelley, Quanzhi Ye, Carrie Holt, Josiah Purdum, Colin Snodgrass, on behalf of the Zwicky Transient Facility Collaboration, and the LCO Outbursting Objects Key Project msk@astro.umd.edu Credentialed by: Carrie Holt (cholt@lco.global) The Astronomer's Telegram ATel17829 We report the discovery of a large apparent outburst of comet 220P/McNaught with the comet near 1.6 au from the Sun. The event was first identified in two Zwicky Transient Facility (ZTF; Bellm et al. ... 2026-06-03T16:59:51-00:00 https://www.astronomerstelegram.org/?read=17817 J. Licandro, V. Kuksenko, Miquel Serra-Ricart, Miguel R. Alarcon, P. Nichita, J. Tonry, L. Denneau, J. Licandro, V. Kuksenko, Miquel Serra-Ricart, Miguel R. Alarcon, P. Nichita, J. Tonry, L. Denneau, jlicandr@iac.es Credentialed by: Javier Licandro (jlicandr@iac.es) The Astronomer's Telegram ATel17817 We report that Centaur 174P/Echeclus has been detected in outburst in four 30s images obtained on 2026 May 11.9 UTC with the 2nd module of the ATLAS-Teide instrument (Licandro et al. ... 2026-05-27T13:28:34-00:00 https://www.astronomerstelegram.org/?read=17799 Michael S. P. Kelley, Zhong-Yi Lin, Carrie Holt, on behalf of the Zwicky Transient Facility Collaboration, and the LCO Outbursting Objects Key Project Michael S. P. Kelley, Zhong-Yi Lin, Carrie Holt, on behalf of the Zwicky Transient Facility Collaboration, and the LCO Outbursting Objects Key Project msk@astro.umd.edu Credentialed by: Carrie Holt (cholt@lco.global) The Astronomer's Telegram ATel17799 We report the discovery and follow-up of two small (-0.7 and -1.1 mag) apparent outbursts of comet 24P/Schaumasse. The first event occurred between two Zwicky Transient Facility (ZTF; Bellm et al. ... 2026-05-13T18:49:49-00:00 https://www.astronomerstelegram.org/?read=17798 Michael S. P. Kelley, Larry Denneau, Carrie Holt, on behalf of the Zwicky Transient Facility Collaboration, and the LCO Outbursting Objects Key Project Michael S. P. Kelley, Larry Denneau, Carrie Holt, on behalf of the Zwicky Transient Facility Collaboration, and the LCO Outbursting Objects Key Project msk@astro.umd.edu Credentialed by: Carrie Holt (cholt@lco.global) The Astronomer's Telegram ATel17798 We report the discovery and follow-up observations of a small (-1.2 mag) apparent outburst of comet 63P/Wild 1. The event was originally recognized by the authors in Zwicky Transient Facility (ZTF; Bellm et al. ... 2026-05-13T18:32:38-00:00 https://www.astronomerstelegram.org/?read=17754 Federico Manzini, Alessandra C. Mura, Paolo Ochner, Andrea Farina, Luigi R. Bedin, Andrea Reguitti, Virginio Oldani Federico Manzini, Alessandra C. Mura, Paolo Ochner, Andrea Farina, Luigi R. Bedin, Andrea Reguitti, Virginio Oldani manzini.ff@aruba.it Credentialed by: Andrea Reguitti (andreareguitti@gmail.com) The Astronomer's Telegram ATel17754 Comet C/2025 R3 (PanSTARRS), a dynamically new comet, is approaching perihelion on 2026 April 20 at a heliocentric distance of about 0.49 AU (JPL-Horizons, https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=c%2F2025%20r3). ... 2026-04-15T10:24:14-00:00 https://www.astronomerstelegram.org/?read=17744 Jiang D., Qian L., Pan Z., Sun C., Yang Q., Huang M., Hao Q., Wang X., Guo M., Zhao L., Zhao Y., Jiang P. Jiang D., Qian L., Pan Z., Sun C., Yang Q., Huang M., Hao Q., Wang X., Guo M., Zhao L., Zhao Y., Jiang P. dongyue5@qq.com Credentialed by: Tong Liu (tongliu@bao.ac.cn) The Astronomer's Telegram ATel17744 Comet C/2025 R3 is a long-period comet that reached perihelion on April 19. We observed this comet with the ultra-wideband receiver of the Five-hundred-meter Aperture Spherical Telescope (FAST) on April 7 and 8, 2026. ... 2026-04-08T13:38:40-00:00