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

[vsnet-alert 26366] ASASSN-21tr: superhump period
by Taichi Kato 27 Oct '21

27 Oct '21

ASASSN-21tr: superhump period Tonny Vanmunster, Tamas Tordai and Itoh-san have reported observations. The superhump period since Oct. 25 is 0.0666(2) d. The amplitude is still small (0.06 mag) and they are most likely stage A superhumps.

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[vsnet-alert 26365] XM78HT: regular superhumps
by Taichi Kato 27 Oct '21

27 Oct '21

XM78HT: regular superhumps The most recent data by Kyoto U. team on Oct. 26 detected clear ordinary superhumps. The superhumps started growing on Oct. 25 (Vihorlat Obs. team). The current period (stage A) is 0.05596(8) d.

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[vsnet-alert 26364] IPHAS J184326.48+060800.9 (eclipsing polar) high state
by Taichi Kato 27 Oct '21

27 Oct '21

IPHAS J184326.48+060800.9 (eclipsing polar) high state http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21ewn/ High state of this polar has not been seen in the ZTF data. First time in recent years. See [vsnet-chat 8874] (Sep. 22) about the nature of this object.

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[vsnet-alert 26363] ASASSN-19ty: new SU UMa-type dwarf nova
by Taichi Kato 26 Oct '21

26 Oct '21

ASASSN-19ty: new SU UMa-type dwarf nova Josch Hambsch has reported observations. This object showed 0.15-mag superhump with a period of about 0.056 d.

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[vsnet-alert 26362] ASASSN-21tr: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 26 Oct '21

26 Oct '21

Dear colleagues, I have been collecting unfiltered CCD observations of ASASSN-21tr over the past several 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 Oct 25/26, 2021. Regular superhumps with an amplitude of 0.11 mag are clearly visible, establishing ASASSN-21tr 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 0.0647 +/- 0.0012d. The object was at mag CV = 15.4 on Oct 25th. 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 26361] Re: Gaia21ewd
by Taichi Kato 26 Oct '21

26 Oct '21

Re: Gaia21ewd > Is this already known? = ASASSN-21tq

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[vsnet-alert 26360] Gaia21ewd
by Taichi Kato 26 Oct '21

26 Oct '21

Gaia21ewd Is this already known? http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21ewd/ Gaia21ewd AT2021abxz 2021-10-24 09:29:11 77.12632 -19.19769 14.03 21.04 0.09 unknown 2021-10-25 07:39:47 UV and Gaia source in 7 mag outburst, candidate CV

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[vsnet-alert 26359] Re: OGLE-MC-DN-0008 in outburst! (since Oct. 19)
by Taichi Kato 26 Oct '21

26 Oct '21

Re: OGLE-MC-DN-0008 in outburst! (since Oct. 19) It looks very likely from the light curve that this object developed superhumps in these days following a smooth decline. Superhumps should be present now.

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[vsnet-alert 26358] OGLE-MC-DN-0008 in outburst! (since Oct. 19)
by Patrick Schmeer 25 Oct '21

25 Oct '21

OGLE-MC-DN-0008 (UG) https://www.aavso.org/vsx/index.php?view=detail.top&oid=478014 I just had a look at the latest ASAS-SN Sky Patrol data for OGLE-MC-DN-0008 and noticed that this dwarf nova is undergoing a rare outburst (which started on Oct. 17 or 18): https://asas-sn.osu.edu/sky-patrol/coordinate/d946ac58-407a-41d0-888f-842db… Time-resolved photometry is urgently required. 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

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[vsnet-alert 26357] OT J002656.6+284933 likely superoutburst
by Taichi Kato 25 Oct '21

25 Oct '21

OT J002656.6+284933 likely superoutburst (=CSS101212:002657+284933) YYYYMMDD(UT) mag observer 20211013.6632 <159c (Yutaka Maeda) 20211014.6574 <167c (Yutaka Maeda) 20211015.6572 <165c (Yutaka Maeda) 20211017.6568 <158c (Yutaka Maeda) 20211023.5999 154:c (Yutaka Maeda)

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