July 2022 - vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 16430] ASASSN-22ho: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 28 Nov '22

28 Nov '22

Dear colleagues, I have just finished analysing my unfiltered CCD observations of ASASSN-22ho, obtained on 2022, June 02/03 at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope and QHY-286M CMOS camera under clear skies. Regular superhumps with an amplitude of 0.35 mag are very clearly visible in the resulting light curve, establishing ASASSN-22ho as a new SU UMa-type dwarf nova. A period analysis using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0), yields a combined (long) superhump period of 0.0902 +/- 0.0025d. The object was at mag CV = 16.5 on Jun 03rd. I will send my observations to AAVSO, CBA and VSNET for further analysis. Best regards Tonny --- Tonny Vanmunster CBA Belgium Observatory CBA Extremadura Observatory http://www.cbabelgium.com PERANSO : The Light Curve and Period Analysis Software http://www.peranso.com

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[vsnet-campaign-dn 16467] TCP J22561804+4109534: new WZ Sge-type dwarf nova
by tonny.vanmunster＠gmail.com 29 Sep '22

29 Sep '22

Dear colleagues, I have just finished analysing my unfiltered CCD observations of TCP J22561804+4109534, obtained on 2022, July 04/05 at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope and QHY-286M CMOS camera under clear skies. I have been observing this object during multiple nights between June 27th and now. On all previous nights, no obvious modulations were visible in the light curve, except for last night when superhumps with an amplitude of 0.14 mag became very clearly visible. A period analysis using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0), yields a combined superhump period of 0.0650 +/- 0.0011d. The object was at mag CV = 15.3 on Jul 05th. The superhump profile shows no signs of a double-waved pattern, and I could not detect early superhumps in my data. Yet, the large outburst amplitude of ~7.4 mag, and the long time for superhumps to develop (approx. 9 days) make this a very likely WZ Sge-type dwarf nova. Follow-up observations are recommended to further track the evolution of the superhumps. I will send my observations to AAVSO, CBA and VSNET for further analysis. Best regards Tonny --- Tonny Vanmunster CBA Belgium Observatory CBA Extremadura Observatory http://www.cbabelgium.com PERANSO : The Light Curve and Period Analysis Software http://www.peranso.com ____________________________________________________________ Center for Backyard Astrophysics (CBA) mailing lists https://cbastro.org/communications/mailing-lists/

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[vsnet-campaign-dn 16478] Re: Var Ret 2005 likely superoutburst
by Taichi Kato 29 Jul '22

29 Jul '22

> This long outburst began between 2022 July 16 and 21. It was > observed at mag. 13 for five days, followed by a rapid fading > on July 27. The outburst was considerably longer than short > outbursts of this dwarf nova, but shorter than standard UGSU > superoutbursts (~14 days). Might be an EI Psc star, although the peak M_V is not too faint.

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[vsnet-campaign-dn 16477] Var Ret 2005 likely superoutburst
by Patrick Schmeer 28 Jul '22

28 Jul '22

Variable Reticuli 2005 (UGSU:) https://www.aavso.org/vsx/index.php?view=detail.top&oid=161100 Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) light curve and data: https://asas-sn.osu.edu/sky-patrol/coordinate/38d59ff4-1572-40ef-a0c5-e280e… This long outburst began between 2022 July 16 and 21. It was observed at mag. 13 for five days, followed by a rapid fading on July 27. The outburst was considerably longer than short outbursts of this dwarf nova, but shorter than standard UGSU superoutbursts (~14 days). Regards, Patrick

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[vsnet-campaign-dn 16476] MASTER OT J001204.00-412337.4: possible WZ Sge star
by Taichi Kato 26 Jul '22

26 Jul '22

MASTER OT J001204.00-412337.4: possible WZ Sge star https://www.wis-tns.org/object/2022pel ASAS-SN data: https://asas-sn.osu.edu/sky-patrol/coordinate/de867b05-f575-4a12-abde-cbb71…

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[vsnet-campaign-dn 16475] TCP J22561804+4109534 rebrightenings
by Taichi Kato 26 Jul '22

26 Jul '22

TCP J22561804+4109534 rebrightenings Tamas Tordai has reported further observations. Five rebrightenings have been recorded up to July 24. The amplitudes, however, are decreasing and frequent small-amplitude rebrightenings resemble those of WZ Sge. This phenomenon is atypical for this orbital period.

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[vsnet-campaign-dn 16474] TCP J22561804+4109534 third rebrightening
by Taichi Kato 22 Jul '22

22 Jul '22

TCP J22561804+4109534 third rebrightening Tamas Tordai and Itoh-san recorded the third rebrightening on July 21.

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[vsnet-campaign-dn 16473] AO Oct likely superoutburst
by Taichi Kato 22 Jul '22

22 Jul '22

AO Oct likely superoutburst YYYYMMDD(UT) mag observer 20220720.538 148 (Rod Stubbings) 20220721.582 148 (Rod Stubbings)

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[vsnet-campaign-dn 16472] ASASSN-22ak outburst
by Taichi Kato 22 Jul '22

22 Jul '22

ASASSN-22ak outburst YYYYMMDD(UT) mag observer 20220720.558 154 (Rod Stubbings) 20220721.578 154 (Rod Stubbings) This object is: Subject: [vsnet-alert 26518] ASASSN-22ak: 13.2m dwarf nova in Indus

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[vsnet-campaign-dn 16471] TCP J22561804+4109534 second rebrightening
by Taichi Kato 20 Jul '22

20 Jul '22

TCP J22561804+4109534 second rebrightening Tamas Tordai reported the second rebrightening on July 19-20. See [vsnet-alert 26866] It would be worth noting that the period 0.065 d is long for a WZ Sge star. If this is indeed a WZ Sge star, it must be a period bouncer.

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vsnet-campaign-dn July 2022