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

[vsnet-alert 26363] ASASSN-19ty: new SU UMa-type dwarf nova
by Taichi Kato 27 Oct '21

27 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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[vsnet-alert 26356] Re: ASASSN-15bu outburst
by Taichi Kato 25 Oct '21

25 Oct '21

Re: ASASSN-15bu outburst YYYYMMDD(UT) mag observer 20211010.6173 <165c (Yutaka Maeda) 20211011.3704 17.274zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211014.6027 <163c (Yutaka Maeda) 20211015.6027 <159c (Yutaka Maeda) 20211017.6020 <159c (Yutaka Maeda) 20211023.6930 152:c (Yutaka Maeda) 20211024.2807 14.932zr (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26355] ASASSN-14ac superoutburst
by Taichi Kato 24 Oct '21

24 Oct '21

ASASSN-14ac superoutburst Outbursts in 2014 and 2018. The 2014 superoutburst was relatively well observed. YYYYMMDD(UT) mag observer 20211006.8029 <159c (Yutaka Maeda) 20211008.8082 <161c (Yutaka Maeda) 20211013.8024 161:c (Yutaka Maeda) 20211014.7122 16.84C (Masayuki Moriyama) 20211014.7931 162:c (Yutaka Maeda) 20211015.144 16.39C (Gary Poyner) 20211015.1459 16.24C (Masao Funada) 20211015.7931 156:cG (Yutaka Maeda) 20211017.6303 152:C (Masayuki Moriyama) 20211017.7927 153:cG (Yutaka Maeda)

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[vsnet-alert 26354] ASASSN-21tq brightened further
by Taichi Kato 24 Oct '21

24 Oct '21

ASASSN-21tq brightened further Itoh-san reported V=14.0 on Oct. 23. Large outburst amplitude.

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