- vsnet-outburst - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-outburst 31539] TCP J16271026-1030020: a new WZ Sge-type dwarf nova candidate possibly with large-amplitude early superhump
by Yusuke Tampo 05 Aug '25

05 Aug '25

TCP J16271026-1030020: a new WZ Sge-type dwarf nova candidate possibly with large-amplitude early superhump TCP J16271026-1030020 was discovered by T. Kojima on 2025-07-25.52 UTC at 13.8 mag (unfiltered). ATLAS force photometry and ASASSN also detect this outburst since 2025-07-22.3 UTC, peaking around g~12.6 mag. The Pan-STARRS1 counterpart is g=22.1(2) mag, giving the outburst amplitude of ~9.5 mag. http://www.cbat.eps.harvard.edu/unconf/followups/J16271026-1030020.html https://vsx.aavso.org/index.php?view=detail.top&oid=10867693 I have obtained the low-resolution spectrum with the Lesedi telescope at the SAAO Sutherland. This spectrum shows prominent Balmer, He II 4686, and other He I emission lines with no absorption features. Itoh-san also reported the time-resolved observations for ~45 min. The light curve shows a modulation of ~0.2 mag. These overall features suggest that TCP J16271026-1030020 is a new large-amplitude dwarf nova, most likely a WZ Sge-type, showing relatively large early superhump amplitude. Further time-resolved observations (with multiple bands, if possible) and time-resolved spectroscopy are encouraged. Best regards, Yusuke -- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow Yusuke TAMPO / 反保雄介 EMAIL: tampo(a)kusastro.kyoto-u.ac.jp ALT. EMAIL: yusuke(a)saao.ac.za ----------------------------------------------

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[vsnet-outburst 31543] Outbursts 2/08/2025
by Rod Stubbings 03 Aug '25

03 Aug '25

Outbursts detected 2/08/2025 object YYMMDD(UT) mag code remarks HYIWX 250802.575 140 Stu.RASNZ outburst PAVGS 250802.432 154 Stu.RASNZ outburst PEGHX 250802.386 146 Stu.RASNZ outburst NSV 35 250802.577 150 Stu.RASNZ outburst -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Honorary Associate member Astronomical Society of Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

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[vsnet-outburst 31541] Recent outbursts
by Rod Stubbings 31 Jul '25

31 Jul '25

Outbursts detected the pas two nights. object YYMMDD(UT) mag code remarks CENMU 250730.415 132 Stu.RASNZ outburst HYAV392 250731.379 148 Stu.RASNZ outburst HYIWX 250730.531 138 Stu.RASNZ outburst HYIDR 250730.531 151 Stu.RASNZ outburst LUPBR 250730.535 145 Stu.RASNZ outburst NORHP 250731.617 145 Stu.RASNZ outburst PEGHX 250731.655 132 Stu.RASNZ outburst TELKK 250730.435 139 Stu.RASNZ outburst ASASSN-14CF 250731.442 151 Stu.RASNZ outburst ASASSN-14LK 250730.425 144 Stu.RASNZ outburst DDE 77 250731.647 136 Stu.RASNZ outburst -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Honorary Associate member Astronomical Society of Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

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[vsnet-outburst 31540] Outbursts 29/07/2025
by Rod Stubbings 29 Jul '25

29 Jul '25

Outbursts detected, 29/07/2025 object YYMMDD(UT) mag code remarks CENNN 250729.381 154 Stu.RASNZ outburst CENV359 250729.387 147 Stu.RASNZ outburst INDTU 250729.400 142 Stu.RASNZ outburst MUSDQ 250729.380 150 Stu.RASNZ outburst OCTAA 250729.419 148 Stu.RASNZ outburst OPHV699 250729.395 150 Stu.RASNZ outburst SCOFQ 250729.364 135 Stu.RASNZ outburst VIRHS 250729.376 146 Stu.RASNZ outburst NSV 11274 250729.382 152 Stu.RASNZ outburst MASTER OT J142023.47-485540.0 250729.440 134 Stu.RASNZ outburst CTCVJ1940-4724 250729.383 144 Stu.RASNZ outburst -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Honorary Associate member Astronomical Society of Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

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[vsnet-outburst 31537] TCP J19181542+3158142: likely a new WZ Sge-type dwarf nova
by Yusuke Tampo 23 Jul '25

23 Jul '25

TCP J19181542+3158142: likely a new WZ Sge-type dwarf nova TCP J19181542+3158142 was discovered by the XOSS team on 18 July at 15.22 mag. The quiescence counterpart is a Pan-STARRS1 source with r=21.35(3) mag, indicating the outburst amplitude of ~6 mag. Itoh-san reported the time-resolved observations for three nights on 19-21 July. Although the scatter is large, PDM analysis yields a period of 0.05525(7) d, with an amplitude of ~0.1 mag and a double-peaked profile, probably early superhumps. Thus, TCP J19181542+3158142 is likely a new WZ Sge-type dwarf nova. This system is a bit faint for time-resolved observations (currently ~15.8 mag), but further observations are encouraged to confirm its superhump profile and evolution. Best regards, Yusuke -- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow Yusuke TAMPO / 反保雄介 EMAIL: tampo(a)kusastro.kyoto-u.ac.jp ALT. EMAIL: yusuke(a)saao.ac.za ----------------------------------------------

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[vsnet-outburst 31536] Outbursts 22/07/2025
by Rod Stubbings 22 Jul '25

22 Jul '25

Outbursts observed 22/07/2025 object YYMMDD(UT) mag code remarks AQRQU 250722.556 160 Stu.RASNZ outburst ARABF 250722.419 142 Stu.RASNZ outburst CAROQ 250722.374 141 Stu.RASNZ outburst CENV342 250722.371 143 Stu.RASNZ outburst CRABP 250722.380 140 Stu.RASNZ outburst CRTBF 250722.368 144 Stu.RASNZ outburst LUPBR 250722.565 145 Stu.RASNZ outburst PAVAS 250722.428 150 Stu.RASNZ outburst PAVGS 250722.385 148 Stu.RASNZ outburst SGRV730 250722.381 151 Stu.RASNZ outburst VIRTW 250722.369 131 Stu.RASNZ outburst VIRHS 250722.431 148 Stu.RASNZ outburst ASASSN-19CT 250722.367 138 Stu.RASNZ outburst -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Honorary Associate member Astronomical Society of Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

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[vsnet-outburst 31535] Recent outbursts
by Rod Stubbings 20 Jul '25

20 Jul '25

Recent outbursts observed. object YYMMDD(UT) mag code remarks AQLFO 250717.492 146 Stu.RASNZ outburst CAROQ 250717.428 142 Stu.RASNZ outburst CENV442 250717.421 120 Stu.RASNZ outburst CENV803 250717.487 143 Stu.RASNZ outburst CIRBZ 250717.576 147 Stu.RASNZ outburst DELEZ 250717.640 149 Stu.RASNZ outburst ERICK 250717.603 136 Stu.RASNZ outburst HYAV392 250717.415 148 Stu.RASNZ outburst HYIVW 250717.471 103 Stu.RASNZ outburst INDTU 250717.481 143 Stu.RASNZ outburst INDCS 250717.476 125 Stu.RASNZ outburst NORHP 250719.607 144 Stu.RASNZ outburst PEGRU 250719.697 120 Stu.RASNZ outburst PEGHX 250719.699 131 Stu.RASNZ outburst PSATY 250717.599 118 Stu.RASNZ outburst SERRY 250717.459 150 Stu.RASNZ outburst SERUZ 250719.613 136 Stu.RASNZ outburst SGRV730 250719.609 158 Stu.RASNZ outburst TRADV 250717.627 130 Stu.RASNZ outburst TUCVW 250719.602 160 Stu.RASNZ outburst ASASSN-14BP 250717.426 149 Stu.RASNZ outburst NSV 11274 250717.443 141 Stu.RASNZ outburst DDE 77 250719.715 139 Stu.RASNZ outburst -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Honorary Associate member Astronomical Society of Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

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[vsnet-outburst 31531] TCP J19335406+4220008: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 16 Jul '25

16 Jul '25

Dear colleagues, I have just completed the analysis of my unfiltered CCD observations of TCP J19335406+4220008, obtained on Jun 29/30 and Jun 30/Jul 01, 2025 at CBA Extremadura Observatory (Spain). The data was collected using a 0.40-m f/5.1 telescope and Moravian G2-4000 CCD camera under clear skies. The object was discovered by XOSS (Mi Zhang, Jianlin Xu, Guoyou Sun, Jiangao Ruan, et al.) on Jun 21st. The light curve clearly reveals the presence of regular superhumps with an amplitude of 0.13 mag, establishing TCP J19335406+4220008 as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.1) yields a combined superhump period of 0.0615 +/- 0.0003d. The object was measured at mag CV = 14.9 on Jul 01st. Image calibration and photometry were performed using the latest release of Phoranso, allowing us to simultaneously collect observations of 4 additional interesting VSX stars in the same FOV. Further observations are encouraged to refine the superhump period. I will submit my observations to AAVSO, CBA and VSNET for further analysis. With kind regards, Tonny --- Tonny Vanmunster CBA Belgium Observatory CBA Extremadura Observatory http://www.cbabelgium.co <http://www.cbabelgium.com/> m PERANSO : The Light Curve and Period Analysis Software http://www.peranso.co <http://www.peranso.com/> m PHORANSO: Photometric Reduction and Analysis Software http://www.phoranso.com <http://www.phoranso.com/>

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[vsnet-outburst 31532] Recent outbursts
by Rod Stubbings 06 Jul '25

06 Jul '25

Recent outbursts observed. object YYMMDD(UT) mag code remarks AQLPQ 250704.723 153 Stu.RASNZ outburst CAPSY 250705.514 140 Stu.RASNZ outburst CAROQ 250704.786 138 Stu.RASNZ outburst CENV342 250705.481 148 Stu.RASNZ outburst CENV803 250705.527 143 Stu.RASNZ outburst INDTT 250705.486 144 Stu.RASNZ outburst INDTU 250705.491 143 Stu.RASNZ outburst NORHP 250706.084 146 Stu.RASNZ outburst OCTAO 250704.767 150 Stu.RASNZ outburst PAVGS 250705.488 149 Stu.RASNZ outburst PEGHX 250704.756 132 Stu.RASNZ outburst SGRV3774 250704.716 148 Stu.RASNZ outburst TUCVW 250704.756 158 Stu.RASNZ outburst VELV383 250705.479 144 Stu.RASNZ outburst ASASSN-17MJ 250705.498 140 Stu.RASNZ outburst -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Honorary Associate member Astronomical Society of Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

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[vsnet-outburst 31530] ASASSN-25cu: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 29 Jun '25

29 Jun '25

Dear colleagues, I have just completed the analysis of my unfiltered CCD observations of ASASSN-25cu, obtained on Jun 27/28 and 28/29, 2025 at CBA Belgium Observatory. The data was collected using a 0.40-m f/10.0 telescope and QHY-268M CMOS camera under clear skies. The light curve clearly reveals the presence of regular superhumps with an amplitude of 0.25 mag, establishing ASASSN-25cu as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.1) yields a combined superhump period of 0.0536 +/- 0.0014d. The object was measured at mag CV = 15.7 on Jun 29th. Image calibration and photometry were performed using the latest release of Phoranso. Further observations are encouraged to refine the superhump period. I will submit my observations to AAVSO, CBA and VSNET for further analysis. With kind regards, Tonny --- Tonny Vanmunster CBA Belgium Observatory CBA Extremadura Observatory http://www.cbabelgium.co <http://www.cbabelgium.com/> m PERANSO : The Light Curve and Period Analysis Software http://www.peranso.co <http://www.peranso.com/> m PHORANSO: Photometric Reduction and Analysis Software http://www.phoranso.com <http://www.phoranso.com/>

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