2025tfu | Transient Name Server

RA/DEC (2000)

19:14:43.658 +60:52:14.07

288.68190637101 +60.870574880492

Type

Redshift

Discovery Report Classification Report

Reporting Group

LAST

Discovering Data Source

LAST

Discovery Date

2025-08-02 18:25:32.736

TNS AT

Public

Discovery Mag

15.33

Filter

Clear-

Reporter/s

E. O. Ofek (WIS), R. Konno (WIS), E. A. Zimmerman (WIS), A. Horowicz (WIS), S. Garrappa (WIS), S. Ben-Ami (WIS), D. Polishook (WIS), O. Yaron (WIS), P. Chen (WIS), A. Krassilchtchikov (WIS), Y. M. Shani (WIS), E. Segre (WIS), A. Gal-Yam (WIS), S. Spitzer (WIS), and K. Rybicki (WIS) on behalf of the LAST Collaboration

NED SIMBAD DECaLS PanSTARRS-1 SkyMapper VizieR WISE DSS ADS

Light curves

▌

LAST_LAST-Cam_Clear

Pointer position (MJD, Mag, Abs.Mag): (0.00, 0.00, 0.00)

Spectra

Select	ID	Obs-date (UT)	Tel / Inst	Exp-Time	Observer/s	Reducer/s	Group	Spectrum ascii file	Spectrum fits file	Spec. Type	Assoc. Groups	End prop. period	Remarks
	21738	2025-08-09 21:00:00	Other / Other	1200	Ottaviani R., Ochner P	Ottaviani R., Ochner P	None	tns_2025tfu_2025-08-09.875_Other_Other_None.txt	tns_2025tfu_2025-08-09.875_Other_Other_None.fits	Object			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.
Binning factor: (rounded to nearest integer >1) Mouse hovers at WL: 0 (rest), ▌Show H at z=v_exp= km/s ▌Show He at z=v_exp= km/s ▌Show He II at z=v_exp= km/s ▌Show C II at z=v_exp= km/s ▌Show C III at z=v_exp= km/s ▌Show C IV at z=v_exp= km/s ▌Show N II at z=v_exp= km/s ▌Show N III at z=v_exp= km/s ▌Show N IV at z=v_exp= km/s ▌Show N V at z=v_exp= km/s ▌Show O at z=v_exp= km/s ▌Show [O I] at z=v_exp= km/s ▌Show O II at z=v_exp= km/s ▌Show [O II] at z=v_exp= km/s ▌Show [O III] at z=v_exp= km/s ▌Show O V at z=v_exp= km/s ▌Show O VI at z=v_exp= km/s ▌Show Na at z=v_exp= km/s ▌Show Mg at z=v_exp= km/s ▌Show Mg II at z=v_exp= km/s ▌Show Si II at z=v_exp= km/s ▌Show S II at z=v_exp= km/s ▌Show Ca II at z=v_exp= km/s ▌Show [Ca II] at z=v_exp= km/s ▌Show Fe II at z=v_exp= km/s ▌Show Fe III at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Tellurics ▌Show Galaxy lines at z= ▌Show WR-WN at z=v_exp= km/s ▌Show WR-WC/O at z=v_exp= km/s 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.

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

Clear-

LAST_LAST-Cam

2025-07-28 23:50:08 - 2025-08-02 18:25:33

2460885.49315 - 2460890.26774

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
507452	2025-08-02 18:25:33	2460890.26774	15.33			ABMag	Clear-	LAST_LAST-Cam	400
507451	2025-07-28 23:50:08	2460885.49315			20.57	ABMag	Clear-	LAST_LAST-Cam	400		[Last non detection]

AT Reports

ID	Time received (UT)	Sender	Reporter/s	Reporting group	Disc. Data Source	RA	DEC	Discovery date (UT)	Discovery Mag.	Filter	Related files	AT Type	Host name	Internal name	Assoc. Groups	End prop. period	Remarks	ADS Bibcode	Unreal	Auto classification
265049	2025-08-05 05:33:04	LAST_Bot1	E. O. Ofek (WIS), R. Konno (WIS), E. A. Zimmerman (WIS) et al.	LAST	LAST	19:14:43.658	+60:52:14.07	2025-08-02 18:25:32.736	15.33	Clear-		PSN			LAST			2025TNSTR3083....1O	N

Classification Reports

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

21738

2025-08-09 23:32:50

Vittorio Andreoli

Ottaviani R., Andreoli V., Ochner P., Balcon C., Castellani.F

None

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.

2025TNSCR3128....1R

Spectra

ID	Obs-date (UT)	Tel / Inst	Exp-Time	Observer/s	Reducer/s	Group	Spectrum ascii file	Spectrum fits file	Spec. Type	Assoc. Groups	End prop. period	Remarks
21738	2025-08-09 21:00:00	Other / Other	1200	Ottaviani R., Ochner P	Ottaviani R., Ochner P	None	tns_2025tfu_2025-08-09.875_Other_Other_None.txt	tns_2025tfu_2025-08-09.875_Other_Other_None.fits	Object			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.

AT 2025tfu

Spectra

Light curves

Comments