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

[vsnet-campaign-dn 16083] 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.

1 0

[vsnet-campaign-dn 16082] 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.

1 0

[vsnet-campaign-dn 16081] 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.

1 0

[vsnet-campaign-dn 16080] 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

1 0

[vsnet-campaign-dn 16079] Re: Gaia21ewd
by Taichi Kato 26 Oct '21

26 Oct '21

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

1 0

[vsnet-campaign-dn 16078] 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

1 0

[vsnet-campaign-dn 16077] 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.

1 0

[vsnet-campaign-dn 16076] 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

1 0

[vsnet-campaign-dn 16075] 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)

1 0

[vsnet-campaign-dn 16074] 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))

1 0