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[vsnet-campaign-dn 17348] 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-campaign-dn 17347] 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-campaign-dn 17346] 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-campaign-dn 17345] 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-campaign-dn 17344] 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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[vsnet-campaign-dn 17343] HS Vir indeed superoutburst
by Taichi Kato 07 Jun '23

07 Jun '23

HS Vir indeed superoutburst Josch Hambsch has recorded superhumps.

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[vsnet-campaign-dn 17342] Carter_SDSSJ173047.59+554518.5 superhumps
by Taichi Kato 06 Jun '23

06 Jun '23

Carter_SDSSJ173047.59+554518.5 superhumps Itoh-san reported observations on June 5 and clear superhumps were visible. The outburst was possibly composed of early superhump-type superoutburst, dip and ordinary superoutburst (type E-like in hydrogen-rich WZ Sge stars).

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[vsnet-campaign-dn 17341] SDSSJ162830.89+240259.1: superhumps
by Taichi Kato 06 Jun '23

06 Jun '23

SDSSJ162830.89+240259.1: superhumps Itoh-san recorded superhumps on June 5. According to http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/13491 G. Masi detected superhumps in 2011. The data are not in our record. If Masi still have the data, please send them to vsnet-campaign-report(a)ooruri.kusastro.kyoto-u.ac.jp

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[vsnet-campaign-dn 17340] Carter_SDSSJ173047.59+554518.5 already after dip
by Taichi Kato 05 Jun '23

05 Jun '23

Carter_SDSSJ173047.59+554518.5 already after dip (AM CVn star) Tamas Tordai and Tonny Vanmunster have reported observations. The was an apparent dip on June 3 and the object was observed to brighten on June 3-4 (with superhumps).

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[vsnet-campaign-dn 17339] ZTF23aajjayv superhump period
by Taichi Kato 05 Jun '23

05 Jun '23

ZTF23aajjayv superhump period Josch Hambsch and Tonny Vanmunster have reported further observations. The object now show superhumps. An analysis of the data since May 31 yielded a period of 0.06786(6) d, amplitude 0.11 mag. Likely a period bouncer.

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