September 2022 - vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 16430] ASASSN-22ho: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 28 Nov '22

28 Nov '22

Dear colleagues, I have just finished analysing my unfiltered CCD observations of ASASSN-22ho, obtained on 2022, June 02/03 at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope and QHY-286M CMOS camera under clear skies. Regular superhumps with an amplitude of 0.35 mag are very clearly visible in the resulting light curve, establishing ASASSN-22ho 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 (long) superhump period of 0.0902 +/- 0.0025d. The object was at mag CV = 16.5 on Jun 03rd. 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 16520] ATLAS18ebr likely superoutburst
by Taichi Kato 30 Sep '22

30 Sep '22

ATLAS18ebr likely superoutburst YYYYMMDD(UT) mag observer 20220921.4632 17.142zg (ZTF Alert DC mag (Masci+ 2019)) 20220922.4676 17.007zg (ZTF Alert DC mag (Masci+ 2019)) 20220922.4881 16.448zr (ZTF Alert DC mag (Masci+ 2019)) 20220924.4706 16.927zr (ZTF Alert DC mag (Masci+ 2019)) 20220924.4913 17.177zg (ZTF Alert DC mag (Masci+ 2019)) 20220925.4462 16.623zr (ZTF Alert DC mag (Masci+ 2019)) 20220925.4885 17.303zg (ZTF Alert DC mag (Masci+ 2019)) 20220926.4502 17.450zg (ZTF Alert DC mag (Masci+ 2019)) 20220926.4895 17.286zr (ZTF Alert DC mag (Masci+ 2019)) 20220927.4679 17.563zg (ZTF Alert DC mag (Masci+ 2019)) 20220927.4918 16.827zr (ZTF Alert DC mag (Masci+ 2019)) 20220928.4793 17.524zg (ZTF Alert DC mag (Masci+ 2019)) 20220928.4923 17.517zr (ZTF Alert DC mag (Masci+ 2019)) 20220929.4509 16.801zr (ZTF Alert DC mag (Masci+ 2019)) 20220929.4851 17.780zg (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-campaign-dn 16519] Gaia DR3 5360745975756861440 bright outburst
by Taichi Kato 30 Sep '22

30 Sep '22

Gaia DR3 5360745975756861440 bright outburst http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia22ebj/ Gaia22ebj AT2022whk 2022-09-27 23:15:32 160.45304 -51.32771 13.43 19.85 0.24 unknown 2022-09-30 11:12:22 ~7 mag outburst in Gaia source, candidate CV 104148.7 -511939 (2000.0) Gaia_DR3_5360745975756861440 CV (score=0.46) 104148.746 -511939.79 (2000.0) Gaia_DR2_5360745975756861440 plx=2.688(0.469) dismod=7.9 pmra=-14.439(0.651) pmdec=9.871(0.673) G=19.801 BP=19.683 RP=19.540 104148.746 -511939.78 (2000.0) Gaia_EDR3_5360745975756861440 plx=2.664(0.326) dismod=7.9 pmra=-14.842(0.327) pmdec=9.786(0.271) G=19.755 BP=19.784 RP=19.602 Bright outburst in 2008 according to ASAS-3: YYYYMMDD(UT) mag observer 20080205.1988 13.079V (ASAS (Pojmanski, G. 2002, Acta Astron. 52,397)) 20080207.3008 13.313V (ASAS (Pojmanski, G. 2002, Acta Astron. 52,397)) 20080210.1938 13.670V (ASAS (Pojmanski, G. 2002, Acta Astron. 52,397)) The outburst amplitude suggests an SU UMa/WZ Sge star.

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[vsnet-campaign-dn 16518] TCPJ23580961+5502508: new WZ Sge-type dwarf nova
by Yusuke Tampo 30 Sep '22

30 Sep '22

TCPJ23580961+5502508: new WZ Sge-type dwarf nova Kyoto Univ. Obs. observed TCPJ23580961+5502508 on 30th Sep. We detected early superhumps with a period of ~0.060 d, and an amplitude of 0.2 mag! Therefore TCPJ23580961+5502508 is a new WZ Sge-type dwarf nova, and also has one of the largest early superhump amplitude. Follow-up photometry is strongly encouraged. Best,Yusuke -- ---------------------------------------------- Kyoto University, Graduate School of Department of Astronomy, PhD student Yusuke TAMPO MAIL: tampo(a)kusastro.kyoto-u.ac.jp ----------------------------------------------

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[vsnet-campaign-dn 16517] MASTER OT J001204.00-412337.4: sixth rebrightening
by Taichi Kato 29 Sep '22

29 Sep '22

MASTER OT J001204.00-412337.4: sixth rebrightening Josch Hambsch detected another rebrightening on Sep. 29 (15.9 mag).

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[vsnet-campaign-dn 16467] TCP J22561804+4109534: new WZ Sge-type dwarf nova
by tonny.vanmunster＠gmail.com 29 Sep '22

29 Sep '22

Dear colleagues, I have just finished analysing my unfiltered CCD observations of TCP J22561804+4109534, obtained on 2022, July 04/05 at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope and QHY-286M CMOS camera under clear skies. I have been observing this object during multiple nights between June 27th and now. On all previous nights, no obvious modulations were visible in the light curve, except for last night when superhumps with an amplitude of 0.14 mag became very clearly visible. A period analysis using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0), yields a combined superhump period of 0.0650 +/- 0.0011d. The object was at mag CV = 15.3 on Jul 05th. The superhump profile shows no signs of a double-waved pattern, and I could not detect early superhumps in my data. Yet, the large outburst amplitude of ~7.4 mag, and the long time for superhumps to develop (approx. 9 days) make this a very likely WZ Sge-type dwarf nova. Follow-up observations are recommended to further track the evolution of the superhumps. 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 ____________________________________________________________ Center for Backyard Astrophysics (CBA) mailing lists https://cbastro.org/communications/mailing-lists/

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[vsnet-campaign-dn 16515] ASASSN-19abr outburst
by Taichi Kato 28 Sep '22

28 Sep '22

ASASSN-19abr outburst YYYYMMDD(UT) mag observer 20220914.5495 <154c (Yutaka Maeda) 20220915.5800 <158c (Yutaka Maeda) 20220919.5428 <154c (Yutaka Maeda) 20220920.5683 <160c (Yutaka Maeda) 20220927.512 153C (Mitsutaka Hiraga)

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[vsnet-campaign-dn 16514] MASTER OT J053628.39+135341.7: likely superoutburst
by Taichi Kato 28 Sep '22

28 Sep '22

MASTER OT J053628.39+135341.7: likely superoutburst Type from ZTF data. The 2020 Jan. superoutburst had a precursor. YYYYMMDD(UT) mag observer 20220919.4041 16.617zg (ZTF Alert DC mag (Masci+ 2019)) 20220919.4874 16.572zg (ZTF Alert DC mag (Masci+ 2019)) 20220921.4699 16.499zg (ZTF Alert DC mag (Masci+ 2019)) 20220924.4648 16.752zr (ZTF Alert DC mag (Masci+ 2019)) 20220924.5015 16.864zg (ZTF Alert DC mag (Masci+ 2019)) 20220926.4459 17.232zg (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-campaign-dn 16513] ASASSN-16cz likely superoutburst
by Taichi Kato 27 Sep '22

27 Sep '22

ASASSN-16cz likely superoutburst Type from ZTF data. The 2020 Oct. superoutburst was followed by a rebrightening.

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[vsnet-campaign-dn 16512] ASASSN-22lj: SU UMa star below the period minimum
by Taichi Kato 26 Sep '22

26 Sep '22

ASASSN-22lj: SU UMa star below the period minimum Josch Hambsch has reported observations. Although nightly coverage was short, the object clearly shows superhumps with an amplitude of 0.09 mag. The period (with aliases) is 0.03761(2) d, indicating that the object is likely an EI Psc star. Observations from different longitudes are desired.

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