2025tzw | Transient Name Server

RA/DEC (2000)

21:09:26.060 +35:48:41.60

317.358583 +35.811556

Type

Redshift

Discovery Report Classification Report

Reporting Group

None

Discovering Data Source

None

Discovery Date

2025-08-15 12:34:33.600

TNS AT

Public

Discovery Mag

15.6

Filter

Clear-

Reporter/s

Yuji Nakamura

NED SIMBAD DECaLS PanSTARRS-1 SkyMapper VizieR WISE DSS ADS

Light curves

▌

Other_Other_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
	21802	2025-08-16 01:00:29	Galileo / BC-Asi	1800	Ottaviani.R., Ochner.P	Ottaviani.R., Ochner.P	None	tns_2025tzw_2025-08-16.042_Galileo_BC-Asi_None.txt	tns_2025tzw_2025-08-16.042_Galileo_BC-Asi_None.fits	Object			We obtained from Asiago 1.22-m telescope + B&C spectrograph a low resolution spectrum (2.25 Ang/pix) on 2025/08/16.042 The spectrum shows a blue continuum with Balmer absorption except for H alpha (6562.8 Ang) which is not present in our spectrum, probably filled-up by the disk emission. All the characteristics are typical of CV stars. We propose the classification of TCP J21092606+3548416 as a CV star.
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 We obtained from Asiago 1.22-m telescope + B&C spectrograph a low resolution spectrum (2.25 Ang/pix) on 2025/08/16.042 The spectrum shows a blue continuum with Balmer absorption except for H alpha (6562.8 Ang) which is not present in our spectrum, probably filled-up by the disk emission. All the characteristics are typical of CV stars. We propose the classification of TCP J21092606+3548416 as a CV star.

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

Clear-

Other_Other

2025-08-15 12:34:34 - 2025-08-15 12:34:34

2460903.024 - 2460903.024

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
509168	2025-08-15 12:34:34	2460903.024	15.6			Other	Clear-	Other_Other			From CBAT, TCP J21092606+3548416: 2025 08 15.5243 Discovered by Yuji Nakamura, Kameyama, Mie, Japan, on four frames (15-s exp. limiting mag. 16.5) using 0.10-m F3.0 refractor + unfiltered cooled CMOS camera. --- Isao Endoh (NAOJ)

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
266008	2025-08-16 09:25:57	Claudio Balcon	Yuji Nakamura et al.			21:09:26.060	+35:48:41.60	2025-08-15 12:34:33.600	15.6	Clear-		PNV						2025TNSTR3229....1N	N

Classification Reports

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

21802

2025-08-16 14:30:46

Vittorio Andreoli

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

None

We obtained from Asiago 1.22-m telescope + B&C spectrograph a low resolution spectrum (2.25 Ang/pix) on 2025/08/16.042 The spectrum shows a blue continuum with Balmer absorption except for H alpha (6562.8 Ang) which is not present in our spectrum, probably filled-up by the disk emission. All the characteristics are typical of CV stars. We propose the classification of TCP J21092606+3548416 as a CV star.

2025TNSCR3234....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
21802	2025-08-16 01:00:29	Galileo / BC-Asi	1800	Ottaviani.R., Ochner.P	Ottaviani.R., Ochner.P	None	tns_2025tzw_2025-08-16.042_Galileo_BC-Asi_None.txt	tns_2025tzw_2025-08-16.042_Galileo_BC-Asi_None.fits	Object			We obtained from Asiago 1.22-m telescope + B&C spectrograph a low resolution spectrum (2.25 Ang/pix) on 2025/08/16.042 The spectrum shows a blue continuum with Balmer absorption except for H alpha (6562.8 Ang) which is not present in our spectrum, probably filled-up by the disk emission. All the characteristics are typical of CV stars. We propose the classification of TCP J21092606+3548416 as a CV star.

AT 2025tzw

Spectra

Light curves

Comments