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

[vsnet-alert 27480] TCP J03400682+4809123: new SU UMa-type dwarf nova
by Taichi Kato 04 Mar '23

04 Mar '23

TCP J03400682+4809123: new SU UMa-type dwarf nova According to Itoh-san's observations on Mar. 3, this object showed superhumps (period about 0.065 d). Superhumps may have already appeared on Feb. 28.

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[vsnet-alert 27479] ASASSN-16de superoutburst?
by Taichi Kato 04 Mar '23

04 Mar '23

ASASSN-16de superoutburst? (Known SU UMa star) YYYYMMDD(UT) mag observer 20230214.8655 <149c (Yutaka Maeda) 20230215.8701 <153c (Yutaka Maeda) 20230221.8241 <152c (Yutaka Maeda) 20230225.8272 158:c (Yutaka Maeda) 20230226.7798 <148c (Yutaka Maeda) 20230227.7792 <140c (Yutaka Maeda) 20230302.8260 <151c (Yutaka Maeda) 20230302.8287 167C (Masayuki Moriyama)

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[vsnet-alert 27478] ASASSN-15le superoutburst?
by Taichi Kato 04 Mar '23

04 Mar '23

ASASSN-15le superoutburst? (Known SU UMa star) YYYYMMDD(UT) mag observer 20230221.8236 <160c (Yutaka Maeda) 20230225.8267 <161c (Yutaka Maeda) 20230226.7793 145:cG (Yutaka Maeda) 20230227.7787 <147c (Yutaka Maeda) 20230302.8255 <154c (Yutaka Maeda) 20230302.8645 149C (Masayuki Moriyama)

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[vsnet-alert 27477] V589 Her possible superoutburst
by Taichi Kato 04 Mar '23

04 Mar '23

V589 Her possible superoutburst YYYYMMDD(UT) mag observer 20230225.7745 <154c (Yutaka Maeda) 20230226.7276 <160c (Yutaka Maeda) 20230227.7272 <156c (Yutaka Maeda) 20230302.7736 148:c (Yutaka Maeda) 20230302.8352 151C (Masayuki Moriyama)

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[vsnet-alert 27476] MASTER OT J055845.55+391533.4: rapid decay of superhumps
by Taichi Kato 04 Mar '23

04 Mar '23

MASTER OT J055845.55+391533.4: rapid decay of superhumps Superhumps in this object rapidly decayed (compared to ordinary SU UMa stars, but similar to AM CVn stars). The object may have already started fading rapidly and further continued observations are requested to know the nature of the (expected) second outburst. Observers: Tonny Vanmunster, Kiyota-san and Kubodera-san.

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[vsnet-alert 27475] ASASSN-23ax: oscillation-type rebrightenings (WZ Sge)
by Taichi Kato 04 Mar '23

04 Mar '23

ASASSN-23ax: oscillation-type rebrightenings (WZ Sge) Josch Hambsch has reported observations. The object now shows oscillation-type rebrightenings as in WZ Sge.

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[vsnet-alert 27474] ASASSN-23bl: possible WZ Sge-type dwarf nova
by Naoto Kojiguchi 03 Mar '23

03 Mar '23

ASASSN-23bl: possible WZ Sge-type dwarf nova Large outburst amplitude of more than 7.3 mag. Possible WZ Sge-type dwarf nova. ASASSN-23bl --- ------- 16:22:35.45 -39:27:36.2 2023-03-2.05 14.39 SDSS DSS VIZIER ------- CV candidate, no Vizier match, g>18.1 on 2023-02-23.26, g=13.6 on 2023-02-24.27, g=14.6 on 2023-02-27.25, g=15.2 on 2023-03-03.39 MPChecker: NO DATA ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/bab56412-76d5-4ef6-874e-c1c22… ASASSN-23bl 20230222.052 <17.307g ASN ASASSN-23bl 20230222.053 <17.178g ASN ASASSN-23bl 20230222.055 <17.163g ASN ASASSN-23bl 20230223.119 19.293o ATF ASASSN-23bl 20230223.125 18.599o ATF ASASSN-23bl 20230223.133 19.067o ATF ASASSN-23bl 20230223.136 18.950o ATF ASASSN-23bl 20230223.261 <17.030g ASN ASASSN-23bl 20230223.263 <17.004g ASN ASASSN-23bl 20230223.264 <16.974g ASN ASASSN-23bl 20230224.278 13.561g ASN ASASSN-23bl 20230224.288 13.604g ASN ASASSN-23bl 20230224.289 13.596g ASN ASASSN-23bl 20230224.291 13.602g ASN ASASSN-23bl 20230224.353 13.641cy ATF ASASSN-23bl 20230224.364 13.646cy ATF ASASSN-23bl 20230224.377 13.652cy ATF ASASSN-23bl 20230224.391 13.680cy ATF ASASSN-23bl 20230225.314 14.020g ASN ASASSN-23bl 20230225.315 14.034g ASN ASASSN-23bl 20230225.316 14.024g ASN ASASSN-23bl 20230225.319 14.036cy ATF ASASSN-23bl 20230225.321 14.032cy ATF ASASSN-23bl 20230225.336 14.039g ASN ASASSN-23bl 20230225.337 13.990cy ATF ASASSN-23bl 20230225.338 13.989g ASN ASASSN-23bl 20230225.339 13.980g ASN ASASSN-23bl 20230225.340 14.036cy ATF ASASSN-23bl 20230226.280 14.292g ASN ASASSN-23bl 20230226.281 14.242g ASN ASASSN-23bl 20230226.282 14.313g ASN ASASSN-23bl 20230227.119 14.342o ATF ASASSN-23bl 20230227.122 14.310o ATF ASASSN-23bl 20230227.127 14.326o ATF ASASSN-23bl 20230227.132 14.314o ATF ASASSN-23bl 20230227.252 14.545g ASN ASASSN-23bl 20230227.254 14.522g ASN ASASSN-23bl 20230227.255 14.503g ASN ASASSN-23bl 20230228.030 14.555o ATF ASASSN-23bl 20230228.049 14.567o ATF ASASSN-23bl 20230228.054 14.553o ATF ASASSN-23bl 20230228.059 14.565o ATF ASASSN-23bl 20230228.285 14.759g ASN ASASSN-23bl 20230228.286 14.800g ASN ASASSN-23bl 20230228.288 14.824g ASN ASASSN-23bl 20230301.288 14.937cy ATF ASASSN-23bl 20230301.291 14.944cy ATF ASASSN-23bl 20230301.295 14.929cy ATF ASASSN-23bl 20230301.300 15.009cy ATF ASASSN-23bl 20230302.006 <15.081g ASN ASASSN-23bl 20230302.007 15.017g ASN ASASSN-23bl 20230302.009 15.174g ASN ASASSN-23bl 20230302.056 15.077g ASN ASASSN-23bl 20230302.057 15.069g ASN ASASSN-23bl 20230302.059 15.051g ASN ASASSN-23bl 20230303.113 15.009o ATF ASASSN-23bl 20230303.117 15.093o ATF ASASSN-23bl 20230303.126 15.090o ATF ASASSN-23bl 20230303.398 15.274g ASN ASASSN-23bl 20230303.400 15.233g ASN ASASSN-23bl 20230303.401 15.118g ASN

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[vsnet-alert 27468] ASASSN-15ny
by Taichi Kato 02 Mar '23

02 Mar '23

ASASSN-15ny True? YYYYMMDD(UT) mag observer 20230227.8624 132:c (Yutaka Maeda)

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[vsnet-alert 27472] DDE 139: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 01 Mar '23

01 Mar '23

Dear colleagues I have just finished analysing my unfiltered CCD observations of DDE 139 obtained on 2023, Feb 27/28 and Feb 28/Mar 01 at CBA Extremadura Observatory (Spain) using a 0.40-m f/5.1 telescope and SX-46 CCD camera under relatively clear skies. The resulting light curve shows the presence of regular superhumps with an amplitude of 0.38 mag, establishing DDE 139 as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Generalized-Lomb-Scargle, PDM and Conditional Entropy methods (Peranso 3.0) yields a combined superhump period of 0.0798 +/- 0.0004d. The object was at mag CV = 16.9 on Mar 01st. 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> http://www.cbabelgium.com PERANSO: The Light Curve and Period Analysis Software http://www.peranso.com

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[vsnet-alert 27471] Long-lasting plateau in SBS1108+574
by Taichi Kato 01 Mar '23

01 Mar '23

Long-lasting plateau in SBS1108+574 Using ATLAS forced photometry (Tonry et al. 2018; Shingles et al. 2021), I noticed this EI Psc-type object showed long-lasting during some of its superoutbursts. The shape of these superoutbursts somewhat looks like those of standstill-like phase of superoutbursts in some AM CVn-type outbursts (EI Psc stars are between hydrogen-rich and AM CVn stars and this is natural). The unusual behavior in MASTER OT J055845.55+391533.4 may be similarly explained.

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