vsnet-outburst October 2025

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

2 participants
5 discussions

[vsnet-outburst 31569] TCP J20522886+1637203: a likely new WZ Sge-type dwarf nova
by tonny.vanmunster＠gmail.com 19 Oct '25

19 Oct '25

Dear colleagues, TCP J20522886+1637203 was discovered by XOSS (Xingming Observatory Sky Survey) on 2025 Oct 08.6 at mag 12.73 CV. The quiescent counterpart is a 22.1 r mag object, implying an outburst amplitude of ~9 mag. I have been observing this object on a very regular basis since Oct 08th with no periodic modulations visible in the light curves - until last night (Oct 17/18). I have just completed the analysis of my unfiltered CCD observations of TCP J20522886+1637203, obtained on 2025 Oct 17/18 at CBA Extremadura Observatory. The data were acquired under clear skies with a 0.40-m f/5.1 telescope and a Moravian G2-4000 CCD. The light curve now shows clear ordinary superhumps with an amplitude of 0.20 mag. Given their late onset (9 dyas after detection) and the large outburst amplitude, we conclude that TCP J20522886+1637203 is a new WZ Sge-type dwarf nova. A period analysis, using ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.1) yields a combined superhump period of 0.0567 +/- 0.0004d. The object was measured at mag CV = 15.0 on Oct 18th. Image calibration and photometry were performed with the latest release of Phoranso, which enabled simultaneous photometry of several additional variable stars within the same frames. Continued monitoring is strongly encouraged to study the superhump profile and evolution. 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 31568] Outbursts 17/10/2025
by Rod Stubbings 18 Oct '25

18 Oct '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks ARAV877 251017.518 142 Stu.RASNZ active CAPSY 251017.524 135 Stu.RASNZ outburst CAROQ 251017.559 140 Stu.RASNZ outburst CHAST 251017.610 143 Stu.RASNZ active CMAWZ 251017.662 155 Stu.RASNZ outburst CMADM 251017.657 152 Stu.RASNZ active DELEZ 251017.419 152 Stu.RASNZ active ERICK 251017.405 134 Stu.RASNZ active ERILT 251017.624 156 Stu.RASNZ outburst HYIDR 251017.406 156 Stu.RASNZ active HYIVW 251017.556 104 Stu.RASNZ active NORHP 251017.506 138 Stu.RASNZ active NORIK 251017.506 139 Stu.RASNZ outburst PEGRU 251017.424 114 Stu.RASNZ active PUPUY 251017.681 140 Stu.RASNZ active PUPCL 251017.680 144 Stu.RASNZ active PUPHO 251017.683 142 Stu.RASNZ active PYXVZ 251017.687 120 Stu.RASNZ active SCOV598 251017.415 152 Stu.RASNZ active SGRV730 251017.496 151 Stu.RASNZ outburst TELKK 251017.549 149 Stu.RASNZ outburst ASASSN-14IS 251017.550 154 Stu.RASNZ outburst ASASSN-14JE 251017.618 162 Stu.RASNZ outburst ASASSN-18FP 251017.409 138 Stu.RASNZ outburst NSV 11274 251017.521 141 Stu.RASNZ active DDE 76 251017.619 139 Stu.RASNZ outburst DDE 77 251017.538 140 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 31567] Outbursts 14/10/2025
by Rod Stubbings 15 Oct '25

15 Oct '25

Outbursts and selected activity observed. object YYMMDD(UT) mag code remarks APSV394 251014.508 156 Stu.RASNZ outburst ARABF 251014.459 141 Stu.RASNZ active ARAV793 251014.463 152 Stu.RASNZ active ARAV877 251014.483 143 Stu.RASNZ outburst CHAST 251014.602 142 Stu.RASNZ active CMADM 251014.636 148 Stu.RASNZ outburst CMAHL 251014.635 124 Stu.RASNZ active CRABP 251014.501 144 Stu.RASNZ outburst DELEZ 251014.440 150 Stu.RASNZ outburst ERICK 251014.406 134 Stu.RASNZ active ERIPS 251014.471 132 Stu.RASNZ active HYIDR 251014.407 151 Stu.RASNZ active NORHP 251014.448 132 Stu.RASNZ active PEGHX 251014.549 132 Stu.RASNZ active PUPUY 251014.651 144 Stu.RASNZ outburst PUPCL 251014.643 154 Stu.RASNZ outburst PUPHO 251014.661 140 Stu.RASNZ outburst PYXVZ 251014.668 122 Stu.RASNZ outburst SCOV478 251014.452 154 Stu.RASNZ active SGRV551 251014.457 150 Stu.RASNZ active TRADV 251014.482 150 Stu.RASNZ active NSV 11274 251014.496 140 Stu.RASNZ active DDE 77 251014.473 141 Stu.RASNZ active -- 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 31566] Outbursts 13/10/2025
by Rod Stubbings 14 Oct '25

14 Oct '25

Outbursts and selected activity. object YYMMDD(UT) mag code remarks AQLFO 251013.444 146 Stu.RASNZ active ARABF 251013.436 138 Stu.RASNZ active ARAV793 251013.443 150 Stu.RASNZ outburst CMAHL 251013.594 120 Stu.RASNZ outburst ERICK 251013.399 138 Stu.RASNZ outburst ERIPS 251013.467 128 Stu.RASNZ active HYIDR 251013.410 151 Stu.RASNZ outburst NORHP 251013.417 132 Stu.RASNZ outburst PEGHX 251013.452 130 Stu.RASNZ outburst SCOV478 251013.426 154 Stu.RASNZ active SCOV598 251013.416 153 Stu.RASNZ outburst SGRV551 251013.429 140 Stu.RASNZ active TRADV 251013.457 142 Stu.RASNZ active NSV 11274 251013.567 141 Stu.RASNZ outburst DDE 77 251013.468 140 Stu.RASNZ active -- 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 31565] Recent outbursts
by Rod Stubbings 10 Oct '25

10 Oct '25

Recent outbursts observed. object YYMMDD(UT) mag code remarks AQLFO 251009.442 135 Stu.RASNZ outburst ARABF 251007.457 138 Stu.RASNZ outburst CETWW 251009.401 109 Stu.RASNZ active ERIPS 251009.377 127 Stu.RASNZ outburst SGRV551 251007.447 140 Stu.RASNZ outburst SCODV 251009.413 148 Stu.RASNZ outburst SGRV729 251007.468 141 Stu.RASNZ outburst SGRV730 251007.467 142 Stu.RASNZ outburst TRADV 251009.415 130 Stu.RASNZ outburst DDE 76 251009.569 140 Stu.RASNZ outburst DDE 77 251009.420 138 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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