December 2021 - vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 16173] MASTER OT J144248.29+673944.7: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 12 Dec '21

12 Dec '21

Dear colleagues, I have been collecting unfiltered CCD observations of MASTER OT J144248.29+673944.7 over multiple nights at CBA Extremadura Observatory, using a 0.40-m f/5.1 telescope and SX-46 CCD camera under (mostly) clear skies. The collected light curves did not show obvious periodic modulations, with the exception of last night Dec 10/11, 2021. Regular superhumps with an amplitude of 0.25 mag are clearly visible, establishing MASTER OT J144248.29+673944.7 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 superhump period of 0.0559 +/- 0.0006d. The object was at mag CV = 15.8 on Dec 11th. 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 16172] ASASSN-21vv
by Taichi Kato 08 Dec '21

08 Dec '21

ASASSN-21vv ASASSN-21vv --- ------- 3:44:15.99 22:7:9.2 2021-12-5.16 14.9 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=21.5, g>17.9 on 2021-12-04.27, g=15.2 on 2021-12-05.16, g=15.4 on 2021-12-06.06, g=15.4 on 2021-12-06.27 ASASSN-21vv 20211204.27 <179g ASN ASASSN-21vv 20211205.16 152g ASN ASASSN-21vv 20211206.06 154g ASN ASASSN-21vv 20211206.27 154g ASN

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[vsnet-campaign-dn 16171] TU Men: no superhumps?
by Taichi Kato 07 Dec '21

07 Dec '21

TU Men: no superhumps? Josch Hambsch have been observing this target. Although some variations were present, no large-amplitude superhumps have been recorded. The current outburst appears to be a long normal outburst.

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[vsnet-campaign-dn 16170] ZTF J210411.01-010202.3 = Gaia21fhx: superoutburst of AM CVn star?
by Taichi Kato 07 Dec '21

07 Dec '21

ZTF J210411.01-010202.3 = Gaia21fhx: superoutburst of AM CVn star? Josch Hambsch have reported observations. The object gradually faded from Nov. 28 to Dec. 4, then followed by sudden fading by 1.8 mag on the next night. This fading rate is too large for a hydrogen-rich dwarf nova. This object may be an AM CVn star (or EI Psc star) and further observations are encouraged.

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[vsnet-campaign-dn 16169] CTCVJ1940-4724
by Taichi Kato 04 Dec '21

04 Dec '21

CTCVJ1940-4724 likely superoutburst http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21fjv/ Gaia21fjv AT2020qvc 2021-12-01 14:29:06 295.15681 -47.41402 13.32 16.12 1.02 CV 2021-12-03 11:07:56 outburst in known CV CTCV J1940-4724

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[vsnet-campaign-dn 16168] CRTS J072144.5+663838 likely superoutburst
by Taichi Kato 04 Dec '21

04 Dec '21

CRTS J072144.5+663838 likely superoutburst (Relatively short supercycle) http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21fjy/ Gaia21fjy AT2021agbm 2021-12-01 23:21:00 110.43524 66.64385 15.57 17.63 0.91 CV 2021-12-03 11:08:16 outburst in confirmed CV CSS111124:072144+663838

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[vsnet-campaign-dn 16167] MASTER OT J030227.28+191754.5: period of early superhumps
by Taichi Kato 03 Dec '21

03 Dec '21

MASTER OT J030227.28+191754.5: period of early superhumps Kyoto U team, Itoh-san, Kiyota-san, Tamas Tordai, Osaka Kyoiku U team, Josch Hambsch and Tonny Vanmunster have reported observations. The period of early superhumps is 0.05985(3) d (full amplitude 0.03 mag). During the rising phase, this period was not detected.

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[vsnet-campaign-dn 16166] TU Men: not much superhumps?
by Taichi Kato 03 Dec '21

03 Dec '21

TU Men: not much superhumps? Josch Hambsch has reported observations on Dec. 2. No prominent superhumps were detected but there were some variations. Let's see whether superhumps develop or not.

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[vsnet-campaign-dn 16165] PU Per: superhumps
by Taichi Kato 03 Dec '21

03 Dec '21

PU Per: superhumps Kiyota-san detected superhumps on Nov. 28.

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[vsnet-campaign-dn 16164] TCP J20441708-2037591: new SU UMa-type dwarf nova
by Taichi Kato 03 Dec '21

03 Dec '21

TCP J20441708-2037591: new SU UMa-type dwarf nova Josch Hambsch, Itoh-san and Kiyota-san have reported observations. According to the data by Hambsch, this object started to show superhumps on Nov. 30. Due to the short visibility in the evening sky, the superhump period has not been yet determined.

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vsnet-campaign-dn December 2021