December 2021 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 26486] DDE 35 superoutburst (since Nov. 24)
by Patrick Schmeer 16 Dec '21

16 Dec '21

DDE 35 (UGSU) Superhump period 0.116 d (above the orbital period gap) https://www.aavso.org/vsx/index.php?view=detail.top&oid=409433 During our ongoing CV monitoring program Patrick Wiggins noticed an outburst of DDE 35 on a CCD image taken on 2021 December 14. According to ATLAS and ASAS-SN Sky Patrol data DDE 35 was already bright on November 24. A precursor outburst was possibly recorded by ATLAS on November 16. https://asas-sn.osu.edu/sky-patrol/coordinate/b75b5ff0-ad77-4e83-b220-5dbbb… https://asas-sn.osu.edu/sky-patrol/coordinate/5c01e639-08a3-4781-ba77-cc5e8… ZTF light curve, data, and images (via Lasair): https://lasair.roe.ac.uk/object/ZTF18accnpno/ Gaia Photometric Science Alerts data: http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia16aoy/ Time-resolved photometry during the current outburst is encouraged. Clear skies, Patrick ------- References: All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol: - Shappee et al., 2014ApJ...788...48S - Kochanek et al., 2017PASP..129j4502K Asteroid Terrestrial-impact Last Alert System (ATLAS): - Tonry et al., 2018PASP..130f4505T Lasair: - Smith et al., 2019RNAAS...3...26S Zwicky Transient Facility (ZTF): - Masci et al., 2019PASP..131a8003M

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[vsnet-alert 26484] MASTER OT J030227.28+191754.5: no ordinary superhumps yet?
by 反保雄介 15 Dec '21

15 Dec '21

MASTER OT J030227.28+191754.5: no ordinary superhumps yet? Kyoto U team, Itoh-san, Kiyota-san, Tamas Tordai, Osaka Kyoiku U team, Vihorlat Observatory, Josch Hambsch, and Tonny Vanmunster have reported further observations. Even though more than 2 weeks have passed since the outburst peak, there are no ordinary superhumps yet. Continuous time-resolved observations are encouraged to catch the growing (stage A) superhumps! Best, Yusuke

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[vsnet-alert 26483] 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-alert 26482] ASASSN-21vv
by Taichi Kato 07 Dec '21

07 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-alert 26481] TU Men: no superhumps?
by Taichi Kato 06 Dec '21

06 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-alert 26480] ZTF J210411.01-010202.3 = Gaia21fhx: superoutburst of AM CVn star?
by Taichi Kato 06 Dec '21

06 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-alert 26479] 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-alert 26478] 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-alert 26477] MASTER OT J030227.28+191754.5: period of early superhumps
by Taichi Kato 02 Dec '21

02 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-alert 26476] TU Men: not much superhumps?
by Taichi Kato 02 Dec '21

02 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-alert December 2021