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

[vsnet-alert 27831] ASASSN-22ak rebrightening
by Taichi Kato 12 Jun '23

12 Jun '23

ASASSN-22ak rebrightening Josch Hambsch has reported observations. The object returned to the bright state on June 9-10 and was still bright on the next night.

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[vsnet-alert 27830] MisV1449: orbital and superhump periods
by Taichi Kato 11 Jun '23

11 Jun '23

MisV1449: orbital and superhump periods Using ZTF data, I obtained an orbital period of 0.1239497(1) d (very clear ellipsoidal variation, 0.17 mag). Tonny Vanmunster and Josch Hambsch reported observations. The superhump period is 0.1333(2) d. This superhump excess (stage B) corresponds to q=0.326.

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[vsnet-alert 27829] ASASSN-23el: new SU UMa star
by Taichi Kato 11 Jun '23

11 Jun '23

ASASSN-23el: new SU UMa star Berto Monard has reported observations. The object shows superhumps (0.19 mag) with a period of 0.0776(2) d. At least not an extreme WZ Sge star.

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[vsnet-alert 27828] ASASSN-22ak sudden fading
by Taichi Kato 09 Jun '23

09 Jun '23

ASASSN-22ak sudden fading Josch Hambsch detected a sudden fading on June 8 (16.2 to 18.0 in one day). The object was still fading. No major rebrightenings were recorded after past outbursts.

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[vsnet-alert 27827] ASASSN-13cz superoutburst
by Taichi Kato 08 Jun '23

08 Jun '23

ASASSN-13cz superoutburst Only the final part was observed during the 2016 one. Supercycle 460 d recently and now is the expected time. YYYYMMDD(UT) mag observer 20230521.6193 <178C (Masayuki Moriyama) 20230523.5753 <161c (Yutaka Maeda) 20230524.3048 19.355zg (ZTF Alert DC mag (Masci+ 2019)) 20230602.5198 <160c (Yutaka Maeda) 20230603.5254 <163c (Yutaka Maeda) 20230604.5180 <159c (Yutaka Maeda) 20230605.2286 17.925zg (ZTF Alert DC mag (Masci+ 2019)) 20230605.2571 17.553zr (ZTF Alert DC mag (Masci+ 2019)) 20230607.5265 147c (Yutaka Maeda) 20230607.5265 147c (Yutaka Maeda)

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[vsnet-alert 27826] Mis V1449: new long-period SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 08 Jun '23

08 Jun '23

Dear colleagues, I have just finished analysing my unfiltered CCD observations of Mis V1449 obtained on 2023, Jun 07/08 at CBA Belgium Observatory using a 0.40-m f/10.0 telescope and QHY-268M CMOS camera under clear skies. My observations were triggered by Taichi Kato's post in vsnet-alert 27825. The resulting light curve clearly shows the presence of regular superhumps with an amplitude of 0.29 mag, establishing Mis V1449 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 0.1261- +/- 0.0013d. The object was at mag CV = 15.1 on Jun 08th. Follow-up observations are recommended to refine the superhump period. 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 27825] MisV1449 rare outburst
by Taichi Kato 07 Jun '23

07 Jun '23

MisV1449 rare outburst Outburst in 2017 May and 2020 Sep. The 2017 one may have been a superoutburst (rebrightening in ATLAS?). The 2020 one was relatively short. Maybe a candidate for an SU UMa star above the period gap similar to SDSSJ094002.56+274942.0. YYYYMMDD(UT) mag observer 20230507.5783 17.109g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230507.5783 17.161g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230509.5134 <17.310g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230606.5216 14.939o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230606.5225 15.022o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230606.5239 14.928o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230606.5305 14.937o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230606.5473 14.916o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-alert 27824] SDSSJ162830.89+240259.1 superhump period
by Taichi Kato 07 Jun '23

07 Jun '23

SDSSJ162830.89+240259.1 superhump period Josch Hambsch and Itoh-san have reported observations. The superhump period is 0.0701(1) d. Amplitude 0.18 mag.

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[vsnet-alert 27823] ASASSN-22ak brightened again
by Taichi Kato 07 Jun '23

07 Jun '23

ASASSN-22ak brightened again Josch Hambsch has reported new observations. The object started to brighten again on June 3. This time, superhumps have not been enhanced.

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[vsnet-alert 27822] GaiaDR32893005857946801152 = ASASSN-23dr, oscillation-type rebrightening
by Taichi Kato 07 Jun '23

07 Jun '23

GaiaDR32893005857946801152 = ASASSN-23dr, oscillation-type rebrightening Josch Hambsch and Maehara-san have reported additional observations. The object faded from superoutburst on May 30-31. After a short dip, the object now shows oscillation-type rebrightenings (like WZ Sge).

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