September 2022 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 26797] ASASSN-22ho: new SU UMa-type dwarf nova

by tonny.vanmunster＠gmail.com

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

6 months, 1 week

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[vsnet-alert 26956] ATLAS18ebr likely superoutburst

by Taichi Kato

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))

8 months, 1 week

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[vsnet-alert 26955] Gaia DR3 5360745975756861440 bright outburst

by Taichi Kato

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.

8 months, 1 week

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[vsnet-alert 26954] TCPJ23580961+5502508: new WZ Sge-type dwarf nova

by Yusuke Tampo

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 ----------------------------------------------

8 months, 1 week

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[vsnet-alert 26953] TCP J23580961+5502508

by Naoto Kojiguchi

TCP J23580961+5502508 Large outburst amplitude of 8.7 mag. Possible WZ Sge-type dwarf nova. TCP J23580961+5502508 2022 09 30.4363* 23 58 09.61 +55 02 50.8 12.0 U Cas 9 0 http://www.cbat.eps.harvard.edu/unconf/followups/J23580961+5502508.html 2022 09 30.436 Discovered by Tadashi Kojima, Tsumagoi,Gunma-ken, Japan, on three frames(5_s exp) under limiting mag.= 13.5 taken by Canon EOS 6D digital camera + 135mm f/3.5 lens. Nothing is visible at this location taken on 2022 Sep29.601 UT under limiting mag.= 14.2, Mag=13.5 taken by Canon EOS 6D digital camera +200mm f3.2lens. 2022 09 30.549 Mag.= 12.0, position end figures 09s.58, 50".3 observed by T. Noguchi, Katori, Japan, using 0.23-m f/10 Schmidt-Cassegrain + unfiltered CCD (KAF-0261E), An image at http://park8.wakwak.com/~ngc/images/TCPinCas_20220930.jpg. 2022 09 30.4435 Yuji Nakamura, Kameyama, Mie, Japan, found this TCP on two frames (6 sec exp. limiting mag 13.5) taken by 135mm/F4.0 lens and CMOS camera. Mag.= 12.2, position end figures 09s.54, 49".9. Nothing is visible at this location on the frames taken on 2022 Sep. 26.4587 UT (6 sec exp. limiting mag 13.5) by same instrument. --- Isao Endoh (NAOJ) IDs: 235809.604 +550250.329 Gaia_DR2_1993876650919517440 Plx=-1.3305(1.2667) dismod=-- pmRA=-6.965(2.818) pmDE=-26.213(1.222) G=20.6889(0.0112) BP-RP=0.5106 E(g-r)=-- E(B-V)=-- Ag=-- Ar=-- Ai=-- 235809.629 +550250.684 Gaia_EDR3_1993876650919517440 Plx=2.4918(0.8465) dismod=8.0 PM=26.721 pmRA=-13.58(1.081) pmDE=-23.013(0.697) G=20.611666(0.008471) BP-RP=0.426098 E(g-r)=0.110 E(B-V)=0.097 Ag=0.387 Ar=0.288 Ai=0.217 235809.572 +550248.802 PS1_DR1_174053595400396965 g=--(--) r=--(--) i=--(--) z=20.6374(0.0806) y=--(--) 235809.610 +550250.321 PS1_DR1_174053595401147507 g=20.7349(0.0215) r=20.7017(0.0399) i=20.7022(0.0305) z=20.6861(0.0456) y=--(--) ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/2cea05a1-2534-4aae-9a9e-6cc26… MPChecker: NO DATA YYYYMMDD(UT) mag code 20220926.4587 <13.5C (Yuji Nakamura) 20220927.609 20.539cy ATF 20220928.343 <17.329g ASN 20220928.344 <17.398g ASN 20220928.346 <17.327g ASN 20220929.430 19.115o ATF 20220929.434 19.325o ATF 20220929.439 19.241o ATF 20220929.601 <14.2C (Tadashi Kojima) 20220930.436 12.0C (Tadashi Kojima) 20220930.4435 12.2C (Yuji Nakamura) 20220930.549 12.0C (Toshihide Noguchi)

8 months, 1 week

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[vsnet-alert 26950] WX Cet rare outburst!

by Rod Stubbings

WX Cet is rising to a rare outburst! CETWX 220929.511 <160 Stu.RASNZ CETWX 220930.506 144 Stu.RASNZ CETWX 220930.528 140 Stu.RASNZ CETWX 220930.553 138 Stu.RASNZ Regards, Rod. -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

8 months, 1 week

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[vsnet-alert 26951] EF Peg outburst

by Hiroyuki Maehara

Visual magnitude estimates by VSOLJ members object YYYYMMDD(UT) mag code PEGEF 20220930.622 133 Mhh.VSOLJ PEGEF 20220930.654 130 Mhh.VSOLJ Observer: Hiroyuki Maehara (Okayama, Japan) Instruments: 30cmL

8 months, 1 week

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[vsnet-alert 26949] MASTER OT J001204.00-412337.4: sixth rebrightening

by Taichi Kato

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

8 months, 1 week

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[vsnet-alert 26865] TCP J22561804+4109534: new WZ Sge-type dwarf nova

by tonny.vanmunster＠gmail.com

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/

8 months, 1 week

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[vsnet-alert 26947] ASASSN-19abr outburst

by Taichi Kato

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)

8 months, 1 week

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vsnet-alert September 2022