Multi-band photometric observations of TCP J00560713+4301406 / ASASSN-26dq in superoutburst

ATel #17939; W. Skrobacz (U. Warsaw, PL), L. Wyrzykowski (U. Warsaw/NCBJ, PL/EASST. eu), J. Kolar (U. Masaryk, CZ/UMK, PL), K. Siennicki (U. Warsaw, PL)
on 4 Aug 2026; 13:49 UT
Credential Certification: Lukasz Wyrzykowski (wyrzykow@astrouw.edu.pl)

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The BHTOM.space network coordinated an observing campaign to monitor the superoutburst of TCP J00560713+4301406 dwarf nova candidate, first detected on June 1, 2026, by NMW- TexasTech survey (Sokolovsky et al.).

Follow-up observations were commenced on June 7, 2026, approximately six days after initial discovery, and are still ongoing. The main superoutburst phase has already ended, and now we are continuing to monitor the object in order to detect a rebrightening.

According to BHTOM photometric data, the superoutburst had an amplitude of approximately 7 mag and a duration of about one month. These features of a superoutburst are typical for WZ Sge-type dwarf nova.

During the period from 7 to 27 June 2026, our follow-up campaign obtained approximately 50 photometric measurements with three instruments: 50-mm Seestar telescope, MUO Ždánice 80-cm telescope and Ostrowik 60-cm Cassegrain Telescope. Photometric data were collected in B, V, R and I filters as well as in Sloan g’ and r’ bands and transformed into Gaia

Synthetic Photometry (GaiaSP). The dataset for TCP J00560713+4301406 was complemented by photometric observations from the ATLAS survey and. Additionally, archival measurements from ATLAS, ZTF, PTF, PS1 and WISE provided coverage over the 2012-2026 period.

The morphological study of the superoutburst already allows us to suggest that this object is a WZ Sge-type dwarf nova. Spectroscopic observations would be valuable to confirm the proposed classification of this object. Photometric observations of the object with BHTOM will continue until the end of the rebrightening phase.

BHTOM is based on the open-source TOM Toolkit by LCO and has been developed with funding from the OPTICON-RadioNet Pilot (ORP) of the European Union's Horizon 2020 research and innovation programme under grant agreement No 101004719 (2021-2025). This project has received funding from the European Union's Horizon Europe Research and Innovation programme ACME under grant agreement No 101131928 (2024-2028).

Target's page in BHTOM with all photometry