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

[vsnet-alert 28022] ASASSN-24fy: new bright outburst from a known WZ Sge star candidate
by Yusuke Tampo 04 Oct '24

04 Oct '24

ASASSN-24fy: new bright outburst from a known WZ Sge star candidate ASAS-SN reported a new CV outburst candidate ASASSN-24fy discovered on 2024-10-1.99 at 11.01 mag. This system was indeed suspected to be a WZ Sge-type CV by Pala et al 2020 based on Gaia data. >Gaia J154008.28-392917.6 https://www.aavso.org/vsx/index.php?view=detail.top&oid=844362 https://ui.adsabs.harvard.edu/abs/2020MNRAS.494.3799P/abstract Time-resolved observations are encouraged to detect superhumps and confirm the outburst nature. Best regards, Yusuke -- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow 反保雄介 Yusuke TAMPO MAIL: tampo(a)kusastro.kyoto-u.ac.jp MAIL: yusuke(a)saao.ac.za ----------------------------------------------

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[vsnet-alert 28021] TCP J18173469+1803499: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 02 Oct '24

02 Oct '24

Dear colleagues I have just finished analysing my unfiltered CCD observations of TCP J18173469+1803499, obtained during 4 consecutive nights between 2024, Sep 28/29 and Oct 01/02 at CBA Extremadura Observatory using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies. This object was detected by the New Milky Way (NMW) survey Camera-2, operating at the Astroverty astrofarm in Russia, on Sep 27th. Superhumps started to emerge in my data set of 2024, Sep 29/30, and are now clearly present in my last set of observations obtained on 2024, Oct 01/02. That light curve shows regular superhumps with an amplitude of 0.11 mag, establishing TCP J18173469+1803499 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 0.0767 +/- 0.0026d. The object was at mag CV = 13.9 on Oct 02nd. Image calibration and photometry were done using my new photometry software Phoranso 1.0.5.1 which allowed me to simultaenously measure 10 other variables present in the FOV of this new SU UMa-type dwarf nova. 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.co <http://www.cbabelgium.com/> m PERANSO : The Light Curve and Period Analysis Software http://www.peranso.co <http://www.peranso.com/> m PHORANSO: Photometric Reduction and Analysis Software *** NEW *** http://www.phoranso.com <http://www.phoranso.com/>

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[vsnet-alert 28020] V854 Cen Possible Fade
by Peter Williams 30 Sep '24

30 Sep '24

The RCB star V854 Cen has just recovered from a deep decline that lasted from January through July 2024. During September 2024 it gradually faded again to visual magnitude 8.1, but it is not clear if this is the onset of another deep decline. It has been cloudy for the past week here at Heathcote NSW , so I have been unable to confirm the current state of V854 Cen. A check on this star would be appreciated - thanks. Recent visual observations : CENV854 20240923.381 81 WPX CENV854 20240922.403 81 WPX CENV854 20240921.398 80 WPX CENV854 20240920.370 80 WPX CENV854 20240919.397 80 WPX CENV854 20240918.393 76 WPX CENV854 20240915.398 76 WPX CENV854 20240913.390 74 WPX CENV854 20240909.440 74 WPX CENV854 20240906.384 76 WPX CENV854 20240905.383 74 WPX CENV854 20240904.404 74 WPX CENV854 20240902.401 74 WPX CENV854 20240901.454 74 WPX CENV854 20240831.374 75 WPX Tks and regards Peter Williams Heathcote NSW 10x50mm binoculars

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[vsnet-alert 28019] TCP J17064645-3528079: new classical nova
by Yusuke Tampo 10 Sep '24

10 Sep '24

TCP J17064645-3528079: new classical nova TCP J17064645-3528079 was discovered by Koichi Itagaki on 2024-09-09.4363 UT at 11.4 mag. I reported the optical spectrum of TCP J17064645-3528079 to ATel and classified it as a new classical nova eruption. https://www.astronomerstelegram.org/?read=16808 Further observations are encouraged. Best regards, Yusuke -- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow Yusuke TAMPO MAIL: tampo(a)kusastro.kyoto-u.ac.jp MAIL: yusuke(a)saao.ac.za ----------------------------------------------

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[vsnet-alert 28018] ASASSN-24fq: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 02 Sep '24

02 Sep '24

Dear colleagues, I have just finished analysing my unfiltered CCD observations of ASASSN-24fq, obtained on 2024, Aug 30/Sep 01 and Sep 01/02 at CBA Extremadura Observatory using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies. The resulting light curve clearly shows the presence of regular superhumps with an amplitude of 0.56 mag, establishing ASASSN-24fq as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle, PDM and Phase-binned AoV methods (Peranso 3.0) yields a combined superhump period of 0.0590 +/- 0.0002d. The object was at mag CV = 15.8 on Aug 13th. Image calibration and photometry were done using my new photometry software Phoranso 1.0.4.8, which allowed me to simultaenously measure several other variables present in the FOV of this new SU UMa-type dwarf nova. 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.co <http://www.cbabelgium.com/> m PERANSO : The Light Curve and Period Analysis Software http://www.peranso.co <http://www.peranso.com/> m PHORANSO: Photometric Reduction and Analysis Software *** NEW *** http://www.phoranso.com <http://www.phoranso.com/>

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[vsnet-alert 28017] ASASSN-24fo: new WZ Sge-type dwarf nova
by Yusuke Tampo 29 Aug '24

29 Aug '24

ASASSN-24fo: new WZ Sge-type dwarf nova ASASSN-24fo was discovered on 2024-08-25.14 by the ASAS-SN team with an ~8.5 mag outburst amplitude. Sjoerd Dufoer and Josch Hambsch reported time-resolved observations. These observations detected a double-waved variation with an amplitude of 0.04 mag and a period of 0.05691(5) d. Therefore ASASSN-24fo is a new WZ Sge-type dwarf nova Further observations are encouraged. Best regards, Yusuke -- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow Yusuke TAMPO MAIL: tampo(a)kusastro.kyoto-u.ac.jp MAIL: yusuke(a)saao.ac.za ----------------------------------------------

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[vsnet-alert 28016] TCP J19470832-0924198: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 16 Aug '24

16 Aug '24

Dear colleagues, I have just finished analysing my unfiltered CCD observations of TCP J19470832-0924198, obtained on 2024, Aug 13/14 at CBA Extremadura Observatory using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies. The resulting light curve clearly shows the presence of superhumps with an amplitude of 0.30 mag, establishing TCP J19470832-0924198 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 0.0565 +/- 0.0012d. The object was at mag CV = 15.0 on Aug 13th. Image calibration and photometry were done using my new photometry software Phoranso 1.0.4.6 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.co <http://www.cbabelgium.com/> m PERANSO : The Light Curve and Period Analysis Software http://www.peranso.co <http://www.peranso.com/> m PHORANSO: Photometric Reduction and Analysis Software *** NEW *** http://www.phoranso.com <http://www.phoranso.com/>

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[vsnet-alert 28015] LMC V1341: new recurrent nova eruption!
by Rod Stubbings 03 Aug '24

03 Aug '24

A new eruption of the recurrent nova LMC V1341! LMC V1341 240801.635 <140 LMC V1341 240803.666 132 LMC V1341 240803.712 132 -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

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[vsnet-alert 28014] EX Lup outburst
by Rod Stubbings 16 Jul '24

16 Jul '24

EX Lup is having an outburst. Cloud prevented further observations. There was also activity in April and May. LUPEX 240702.355 127 LUPEX 240703.386 126 LUPEX 240705.634 124 LUPEX 240706.378 126 LUPEX 240707.362 120 LUPEX 240710.371 118 LUPEX 240712.366 120 LUPEX 240716.556 109 LUPEX 240716.566 109 LUPEX 240716.580 108 Activity for EX Lup was observed in April and May. LUPEX 240403.542 128 LUPEX 240407.505 124 LUPEX 240411.533 124 LUPEX 240413.542 125 LUPEX 240414.494 124 LUPEX 240419.481 118 LUPEX 240419.490 118 LUPEX 240419.569 121 LUPEX 240420.454 118 LUPEX 240421.446 122 LUPEX 240421.498 122 LUPEX 240428.456 122 LUPEX 240430.479 126 LUPEX 240501.479 122 LUPEX 240502.475 121 LUPEX 240503.462 120 LUPEX 240504.515 122 LUPEX 240505.463 122 LUPEX 240506.444 122 LUPEX 240507.456 127 LUPEX 240508.484 127 LUPEX 240512.441 122 LUPEX 240514.444 130 -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

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[vsnet-alert 28013] TCP J00003597+1757408: possible stage A superhump
by Kojiguchi 16 Jul '24

16 Jul '24

TCP J00003597+1757408: possible stage A superhump Stephen M. Brincat, Josch Hambsch, Vihorlat Observatory team and Kyoto U. team have reported further time-resolved observations. Also Masao Funada have reported further snapshots. According to the observations by Stephen M. Brincat and Josch Hambsch, this object has clearly showed ordinary superhump with about 0.2 mag since July 14. The superhump period is 0.0587(1) d. Possible stage A superhump. Further observations are encouraged.

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