TNS Classification Report No. 21738 [ 2025TNSCR3128....1R ]
Date Received (UTC): 2025-08-09 23:32:50 Sender: Vittorio Andreoli
Group: None
Ottaviani R., Andreoli V., Ochner P., Balcon C., Castellani.F report/s a classification of object: AT 2025tfu
Type: CV
Remarks: Low-resolution spectrum was obtained with the 1.22-m telescope and B&C spectrograph (dispersion: 2.25 Å/pixel) located in Asiago (Italy) on 2025-08-09.875 UT. The spectrum shows a blue continuum with strong Balmer absorption lines, except for Hα, which appears weak because it is partially filled up by the disk emission. He I 5876 and He I 4471 are also present. These features are typically observed in cataclysmic variables (CVs), therefore we classify 2025tfu as a CV star. We also obtain BVRI photometry with 0.4-m DK telescope + Moravian G4 CCD full frame located in Novezzina (Italy), date 2025-08-09.917 UT with results B=15.839 ± 0.035 V=15.965 ± 0.047 R=15.888 ± 0.042 I=15.757±0.039. At the same position, the CV star OT J191443.6+605214 is known. From ZTF survey data, we note that this object undergoes an outburst approximately once per year, with the last recorded event in 2024. We therefore conclude that 2025tfu is OT J191443.6+605214 in its 2025 outburst.
The following Classification spectrum was provided:
Obsdate: 2025-08-09 21:00:00
Instrument: Other
Telescope: Other
Remarks: 2.25 Å/pixel) located in Asiago (Italy) on 2025-08-09.875 UT. The spectrum shows a blue continuum with strong Balmer absorption lines, except for Hα, which appears weak because it is partially filled up by the disk emission. He I 5876 and He I 4471 are also present. These features are typically observed in cataclysmic variables (CVs), therefore we classify 2025tfu as a CV star. We also obtain BVRI photometry with 0.4-m DK telescope + Moravian G4 CCD full frame located in Novezzina (Italy), date 2025-08-09.917 UT with results B=15.839 ± 0.035 V=15.965 ± 0.047 R=15.888 ± 0.042 I=15.757±0.039. At the same position, the CV star OT J191443.6+605214 is known. From ZTF survey data, we note that this object undergoes an outburst approximately once per year, with the last recorded event in 2024. We therefore conclude that 2025tfu is OT J191443.6+605214 in its 2025 outburst.
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2025tfu
Date Received (UTC): 2025-08-09 23:32:50 Sender: Vittorio Andreoli
Group: None
Ottaviani R., Andreoli V., Ochner P., Balcon C., Castellani.F report/s a classification of object: AT 2025tfu
Type: CV
Remarks: Low-resolution spectrum was obtained with the 1.22-m telescope and B&C spectrograph (dispersion: 2.25 Å/pixel) located in Asiago (Italy) on 2025-08-09.875 UT. The spectrum shows a blue continuum with strong Balmer absorption lines, except for Hα, which appears weak because it is partially filled up by the disk emission. He I 5876 and He I 4471 are also present. These features are typically observed in cataclysmic variables (CVs), therefore we classify 2025tfu as a CV star. We also obtain BVRI photometry with 0.4-m DK telescope + Moravian G4 CCD full frame located in Novezzina (Italy), date 2025-08-09.917 UT with results B=15.839 ± 0.035 V=15.965 ± 0.047 R=15.888 ± 0.042 I=15.757±0.039. At the same position, the CV star OT J191443.6+605214 is known. From ZTF survey data, we note that this object undergoes an outburst approximately once per year, with the last recorded event in 2024. We therefore conclude that 2025tfu is OT J191443.6+605214 in its 2025 outburst.
The following Classification spectrum was provided:
Obsdate: 2025-08-09 21:00:00
Instrument: Other
Telescope: Other
Remarks: 2.25 Å/pixel) located in Asiago (Italy) on 2025-08-09.875 UT. The spectrum shows a blue continuum with strong Balmer absorption lines, except for Hα, which appears weak because it is partially filled up by the disk emission. He I 5876 and He I 4471 are also present. These features are typically observed in cataclysmic variables (CVs), therefore we classify 2025tfu as a CV star. We also obtain BVRI photometry with 0.4-m DK telescope + Moravian G4 CCD full frame located in Novezzina (Italy), date 2025-08-09.917 UT with results B=15.839 ± 0.035 V=15.965 ± 0.047 R=15.888 ± 0.042 I=15.757±0.039. At the same position, the CV star OT J191443.6+605214 is known. From ZTF survey data, we note that this object undergoes an outburst approximately once per year, with the last recorded event in 2024. We therefore conclude that 2025tfu is OT J191443.6+605214 in its 2025 outburst.
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2025tfu