The Astronomer’s Telegram is a system for reporting and commenting on new astronomical observations. The latest reports are listed here.

ATel 17805: Spectroscopy of the Nova AT2026clk obtained in France

18 May 2026 at 12:05pm
Spectra of AT2026clk were obtained on May17, 2026, by C.Buil (from the STAROS project, and member of RAPAS) with his 0.2m Newton telescope located at Antibes in the south of France. ... Read more...

ATel 17804: Identification and spectroscopic classification of a reddened cla...

15 May 2026 at 6:04pm
We report the identification and spectroscopic observations of a bright optical and near-IR (NIR) transient found in the regular survey operations of the the Zwicky Transient Facility (ZTF, Bellm et al. ... Read more...

ATel 17803: Spectroscopic Classification of AT 2026mko with the Lick Shane Te...

15 May 2026 at 4:55pm
We report the classification of AT 2026mko from spectroscopic observations with the Kast spectrograph on the Shane telescope obtained on 2026 May 15 UT. ... Read more...

ATel 17801: Discovery of a likely new Galactic recurrent nova with ZTF, ASAS-...

14 May 2026 at 5:52pm
We report the discovery of a new recurrent nova AT2026lck in the Milky Way, based on data from the Zwicky Transient facility (ZTF, Bellm et al. 2018), the All-sky Automated Survey for Supernovae (ASAS-SN, Kochanek et al. ... Read more...

ATel 17797: Discovery of a Probable Nova in M31, M31N 2026-05a

12 May 2026 at 9:58pm
We report the discovery of a probable nova in M31 on a co-added 7800-s H_alpha CMOS frame taken on 2026 May 10.030 UT with the 0.4-m telescope at Belec nad Orlici (HVBO). ... Read more...

ATel 17796: ASKAP VAST observations of SPT-SV J222602.8-540533

12 May 2026 at 1:41pm
SPT-SV J222602.8-540533 (ATel #17781) was discovered as a millimeter (mm) transient by the South Pole telescope (SPT) on 2026 April 13 UT. The source exhibited flaring behavior with a inverted spectrum (brighter at 150 GHz than 95 GHz) suggesting that the transient might be self-absorbed at lower... Read more...

ATel 17793: Spectroscopic Classifications of Optical Transients with Keck II/...

11 May 2026 at 10:35am
We report the following classifications of optical transients from spectroscopic observations with the Keck Cosmic Web Imager (KCWI) Integral Field Spectrograph. ... Read more...

ATel 17791: Spectroscopic and photometric confirmation of TCP J07151825+47531...

10 May 2026 at 5:43pm
We report on spectral features seen in the transient TCP J07151825+4753167 on 2026-05-09.534 UT and TCP J15030519+2202041 on 2026-05-09.554 obtained by using a fiber-fed integral field spectrograph (KOOLS-IFU; Matsubayashi et al. ... Read more...

ATel 17788: Confirmation that M31N 2026-04c is the fourth reported eruption o...

9 May 2026 at 10:18pm
As reported in ATel #17765, M31N 2026-04c was deemed a very likely an outburst of the known recurrent nova M31N 1960-12a. To confirm it, we have carefully registered our co-added 5400-s R-band CMOS image taken on 2026 Apr. ... Read more...

ATel 17784: Recent UBV photometry of T CrB

9 May 2026 at 2:36pm
We present our recent photometric observations of T CrB obtained on the 5th and 6th of May 2026 and we compare them with the ones from ATel#17052 an year ago. ... Read more...


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