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

[vsnet-alert 26280] MASTER OT J055845.55+391533.4 superoutburst
by Taichi Kato 30 Sep '21

30 Sep '21

MASTER OT J055845.55+391533.4 superoutburst ZTF light curves of past superoutbursts have complex profiles. May not be an ordinary SU UMa star. YYYYMMDD(UT) mag observer 20210828.8465 <142c (Yutaka Maeda) 20210829.8457 <146c (Yutaka Maeda) 20210830.8308 <162c (Yutaka Maeda) 20210831.8157 <156c (Yutaka Maeda) 20210909.7884 146:cG (Yutaka Maeda) 20210911.1820 14.20cG (Masao Funada) 20210918.7888 <162c (Yutaka Maeda) 20210919.8442 <159c (Yutaka Maeda) 20210922.7850 <152c (Yutaka Maeda) 20210923.7868 153c (Yutaka Maeda) 20210924.7913 153:c (Yutaka Maeda) 20210926.069 15.14C (Gary Poyner) 20210926.0696 15.13C (Masao Funada) 20210927.7853 151cG (Yutaka Maeda)

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[vsnet-alert 26279] SDSS J203501.46-001946.1 outburst
by Taichi Kato 29 Sep '21

29 Sep '21

SDSS J203501.46-001946.1 outburst Subtype unknown. Somewhat looks like an SU UMa star in ZTF data. YYYYMMDD(UT) mag observer 20210907.2488 17.831zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210909.3393 17.696zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210911.3211 17.875zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210927.2251 15.424zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210929.1714 15.677zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210929.2145 15.641zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26278] CRTS J210820.6-134909 outburst
by Taichi Kato 29 Sep '21

29 Sep '21

CRTS J210820.6-134909 outburst AM CVn star suspected. YYYYMMDD(UT) mag observer 20210929.2474 17.421zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26277] ASASSN-15qr possible superoutburst
by Taichi Kato 29 Sep '21

29 Sep '21

ASASSN-15qr possible superoutburst Known SU UMa star. YYYYMMDD(UT) mag observer 20210929.1733 15.932zr (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26276] ASASSN-15jq possible superoutburst
by Taichi Kato 29 Sep '21

29 Sep '21

ASASSN-15jq possible superoutburst Suspected type from ZTF data. YYYYMMDD(UT) mag observer 20210905.2505 19.893zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210905.2507 19.893zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210909.3393 19.235zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210911.3211 19.577zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210915.2090 <170C (Masao Funada) 20210916.2554 19.933zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210927.2251 16.345zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210929.1714 16.523zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210929.2145 16.593zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26275] ASASSN-16gr outburst
by Taichi Kato 29 Sep '21

29 Sep '21

ASASSN-16gr outburst Subtype unknown. Bright outburst. YYYYMMDD(UT) mag observer 20210820.4678 <147c (Yutaka Maeda) 20210827.4723 <138c (Yutaka Maeda) 20210828.4531 <148c (Yutaka Maeda) 20210927.2318 15.567zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210929.1719 15.775zr (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26274] AHTS-2020-001 possible superoutburst
by Taichi Kato 29 Sep '21

29 Sep '21

AHTS-2020-001 possible superoutburst Type from ZTF data. YYYYMMDD(UT) mag observer 20210926.1756 16.511zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210928.1909 16.947zr (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26273] ZTF21aceijig: a CV candidate with large amplitude (> ~ 6 mag)
by Kenta TAGUCHI 28 Sep '21

28 Sep '21

Dear friends, Using my private system scraping MARS ( https://mars.lco.global ), I've just found ZTF21aceijig out as a CV candidate from the public ZTF data. It's amplitude is > ~ 6.0 mag (assuming the limiting mag of PS1-g is 21.6). (I'm sorry if someone has already discovered and reported it elsewhere.) Lasair: https://lasair.roe.ac.uk/object/ZTF21aceijig ALeRCE: https://lasair.roe.ac.uk/object/ZTF21aceijig MARS: https://mars.lco.global/?objectId=ZTF21aceijig According to ALeRCE, the position is (RA, Dec) = (01:49:59.397, +54:39:27.24) Last non-detections by ZTF: g > 19.6426 on 2021-09-23.40 (ZTF, 'difference mag' via ALeRCE) r > 19.9288 on 2021-09-23.44 (ZTF, 'difference mag' via ALeRCE) Last non-detection by ASAS-SN: g > 17.124 on 2021-09-27.5628629 First detections by ZTF: g = 15.694 +/- 0.036 on 2021-09-28.33 (ZTF, 'difference mag' via ALeRCE) r = 15.865 +/- 0.032 on 2021-09-28.41 (ZTF, 'difference mag' via ALeRCE) The result of ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/2f155ab7-61ac-4b06-9fb7-68d40… There are no possible counterparts recorded in the PS1 mean object catalog. No known minor planets are found by the Minor Planet Checker ( https://www.minorplanetcenter.net/cgi-bin/checkmp.cgi ). Best Regards and Clear Skies, Kenta -- ________________________________________________________________ 田口健太　(TAGUCHI, Kenta) 京都大学大学院理学研究科宇宙物理学教室 (Department of Astronomy, Graduate School of Science, Kyoto University) kentagch(a)kusastro.kyoto-u.ac.jp <mailto:kentagch@kusastro.kyoto-u.ac.jp> 09090536980

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[vsnet-alert 26272] MV Lyr fading
by Taichi Kato 27 Sep '21

27 Sep '21

MV Lyr fading YYYYMMDD(UT) mag observer 20210818.8979 126 (Jose Ripero) 20210819.5537 133cG (Yutaka Maeda) 20210819.5972 129cG (Yutaka Maeda) 20210827.5989 129cG (Yutaka Maeda) 20210827.6158 132C (Masayuki Moriyama) 20210827.892 130 (Gary Poyner) 20210828.6051 132cG (Yutaka Maeda) 20210828.899 132 (Gary Poyner) 20210829.033 13.16C (Gary Poyner) 20210829.562 129 (Hiroyuki Maehara) 20210829.6161 134cG (Yutaka Maeda) 20210902.8632 133 (Eddy Muyllaert) 20210903.8903 133 (Eddy Muyllaert) 20210905.8556 134 (Eddy Muyllaert) 20210906.8625 134 (Eddy Muyllaert) 20210906.933 133 (Gary Poyner) 20210907.880 134 (Gary Poyner) 20210908.6097 132cG (Yutaka Maeda) 20210908.8438 133 (Eddy Muyllaert) 20210909.6353 13.15C (Masayuki Moriyama) 20210909.8674 133 (Eddy Muyllaert) 20210910.8396 133 (Eddy Muyllaert) 20210910.8799 132 (Jose Ripero) 20210911.8396 134 (Eddy Muyllaert) 20210915.8479 133 (Eddy Muyllaert) 20210915.869 134 (Gary Poyner) 20210918.5203 133cG (Yutaka Maeda) 20210919.5471 133cG (Yutaka Maeda) 20210919.894 133 (Gary Poyner) 20210920.8368 133 (Eddy Muyllaert) 20210921.976 134 (Gary Poyner) 20210922.4979 135cG (Yutaka Maeda) 20210922.8458 133 (Eddy Muyllaert) 20210923.4813 137:cG (Yutaka Maeda) 20210923.4966 138cG (Yutaka Maeda) 20210923.8326 133 (Eddy Muyllaert) 20210923.851 133 (Gary Poyner) 20210924.4986 135cG (Yutaka Maeda) 20210924.6506 138C (Masayuki Moriyama) 20210926.6054 13.79C (Masayuki Moriyama)

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[vsnet-alert 26271] ASASSN-21sb: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 27 Sep '21

27 Sep '21

Dear colleagues, I have just finished analysing my time-series observations of ASASSN-21sb, obtained on 2021, Sep 25/26 and Sep 26/27 at resp. CBA Extremadura Observatory and CBA Belgium observatory, using 0.40-m telescopes with SX-46 CCD and QHY-268M CMOS camera's. Regular superhumps with an amplitude of 0.32 mag are clearly visible in the resulting light curve, establishing ASASSN-21sb 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 0.0589 +/- 0.0003d. The object was at mag CV = 16.2 on Sep 27th. 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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