August 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

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

6 months

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[vsnet-campaign-dn 16467] TCP J22561804+4109534: new WZ Sge-type dwarf nova

by tonny.vanmunster＠gmail.com

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/

8 months

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[vsnet-campaign-dn 16499] V507 Cyg: IW And-type dip following standstill

by Taichi Kato

V507 Cyg: IW And-type dip following standstill YYYYMMDD(UT) mag observer 20220719.6701 154C (Masayuki Moriyama) 20220721.7590 15.39C (Masayuki Moriyama) 20220722.8024 154C (Masayuki Moriyama) 20220723.7856 152C (Masayuki Moriyama) 20220725.8145 154C (Masayuki Moriyama) 20220726.7538 154C (Masayuki Moriyama) 20220728.5754 153C (Masayuki Moriyama) 20220801.6220 153C (Masayuki Moriyama) 20220805.7024 153C (Masayuki Moriyama) 20220807.7518 <140C (Masayuki Moriyama) 20220814.7133 <151C (Masayuki Moriyama) 20220818.5427 146C (Masayuki Moriyama) 20220821.8101 14.74C (Masayuki Moriyama) 20220822.6953 150C (Masayuki Moriyama) 20220824.7903 157C (Masayuki Moriyama) 20220825.5598 160C (Masayuki Moriyama) 20220826.7249 166C (Masayuki Moriyama) 20220827.6764 161C (Masayuki Moriyama) 20220828.7399 15.70C (Masayuki Moriyama)

9 months

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[vsnet-campaign-dn 16498] MASTER OT J001204.00-412337.4: second rebrightening

by Taichi Kato

MASTER OT J001204.00-412337.4: second rebrightening Josch Hambsch detected the second post-superoutburst rebrightening on Aug. 27.

9 months

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[vsnet-campaign-dn 16497] CRTS J131103.5-414622 outburst

by Taichi Kato

CRTS J131103.5-414622 outburst Large-amplitude outburst. Gaia22dme AT2022rus 2022-08-21 05:13:56 197.76459 -41.77282 14.27 unknown 2022-08-22 16:03:39 outburst in candidate CV SSS 110423:131104-414622 http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia22dme/

9 months

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[vsnet-campaign-dn 16496] ASASSN-22jz: revised period of early superhumps

by Taichi Kato

ASASSN-22jz: revised period of early superhumps Using the period of ordinary superhumps, I re-analyzed the data reported in [vsnet-alert 26907]. The correct period of early superhumps was an one-day alias to vsnet-alert 26907. P(ESH)=0.05700(3) d.

9 months

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[vsnet-campaign-dn 16495] PS1-3PIJ035747.16-063851.1 = Gaia DR3 324488617195639360 = ASASSN-22kc = ZTF19abuskjw: new SU UMa-type dwarf nova

by Taichi Kato

PS1-3PIJ035747.16-063851.1 = Gaia DR3 324488617195639360 = ASASSN-22kc = ZTF19abuskjw: new SU UMa-type dwarf nova Josch Hambsch and Itoh-san have reported observations. The object shows superhumps with a period of 0.05761(3) d (amplitude 0.10 mag).

9 months

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[vsnet-campaign-dn 16494] MASTER OT J001204.00-412337.4: rebrightening

by Taichi Kato

MASTER OT J001204.00-412337.4: rebrightening Josch Hambsch has detected a rebrightening on Aug. 17. Having unusual outburst property, this object deserves continuous attention and time-resolved photometry.

9 months, 1 week

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[vsnet-campaign-dn 16493] ASASSN-22jz: new WZ Sge-type dwarf nova

by Taichi Kato

ASASSN-22jz: new WZ Sge-type dwarf nova Berto Monard has reported observations on two nights. The object was fading rather rapidly (0.3 mag/d), probably in viscous fading phase. Although there were much irregularity, I could detect a period of 0.05404(4) d (double wave, 0.035 mag). Although the profile is not very typical for early superhumps, the period appears to be real based on the appearance of one-day aliases. The rather unusual profile of early superhumps a result of their low amplitude and overlapping irregularity. Considering the outburst amplitude and peak M_V, this object can be identified to be a WZ Sge star.

9 months, 2 weeks

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[vsnet-campaign-dn 16492] MASTER OT J001204.00-412337.4: strange behavior

by Taichi Kato

MASTER OT J001204.00-412337.4: strange behavior Josch Hambsch has reported new observations. The object started fading rapidly on Aug. 8. The duration of the superoutburst (8 d) is too short for a WZ Sge star. Observations of subsequent behavior are very important (the object still shows superhumps).

9 months, 3 weeks

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vsnet-campaign-dn August 2022