The Astronomer’s Telegram News
The Astronomer’s Telegram is a system for reporting and commenting on new astronomical observations. The latest reports are listed here.
ATel 18103: Sloan g'r'i' Photometry of the Type Ic-BL SN 2026acxa
2026-10-13 12:53
The Astronomer's Telegram: Nova
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. ...
ATel 18102: Gaia20dsz: superhumps detected during a new superoutburst
2026-10-12 18:58
The Astronomer's Telegram: Variables
The next superoutburst of Gaia20dsz/AT 2020rgw was predicted by our Outbursts Alerting System to occur within MJD 61309-61324. Based on this prediction, we initiated time-resolved photometric observations to monitor the expected outburst and search for...
ATel 18097: Extreme Velocity Gradients in the Atmosphere of Betelgeuse: Is Another Dimming Event Imminent?
2026-10-08 18:50
The Astronomer's Telegram: Variables
Red supergiant Betelgeuse (Alpha Ori; HD 39801; MI1-2 Iab) underwent a historical Great Dimming event during 2019/2020, reaching a minimum of V ~ 1.6 mag in February 2020 (see ATel #13341, #13365, #13410, #13439, #13512, #13518, #13601, #13901,...
ATel 18096: Dust formation in the M31 nova AT2026aabo
2026-10-08 13:34
The Astronomer's Telegram: Nova
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). ...
ATel 18091: Independent Discovery and Time-Resolved Photometry of AT 2026adgl
2026-10-05 20:43
The Astronomer's Telegram: Nova
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. ...
ATel 18090: V488 Sge transitions to the nebular phase: the significant [O III] emission
2026-10-05 17:28
The Astronomer's Telegram: Nova
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). ...
ATel 18088: VLA radio detection of Nova Sagittae 2026 (V488 Sge)
2026-10-03 19:36
The Astronomer's Telegram: Nova
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...
ATel 18087: S-CUBED Detects Supersoft X-ray Counterpart to the SMC Nova ASASSN-26dt
2026-10-03 12:18
The Astronomer's Telegram: Nova
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). ...
ATel 18086: Swift X-ray and ultraviolet followup observations of the new enhanced activity phase of SU Lyn
2026-10-02 16:12
The Astronomer's Telegram: Nova
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...
ATel 18084: V488 Sge has become a super-soft X-ray source
2026-10-01 19:09
The Astronomer's Telegram: Nova
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). ...
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