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[vsnet-chat 9382] Gaia DR3 797435239135183744 = SDSS J093130.75+335651.2: eclipsing dwarf nova below the period gap
by Taichi Kato 01 May '23

01 May '23

Gaia DR3 797435239135183744 = SDSS J093130.75+335651.2: eclipsing dwarf nova below the period gap From ZTF data. Min(BJD) = 2459110.978 + 0.0799401(2) E Bright outburst (at least reaching r=15.6) was in 2020 Sep. and ZTF snapshot data recorded the fading part. Due to the period close to 2/25 d, only phases around eclipses were incidentally recorded by ZTF (observational intervals 2 d). Depths of eclipse more than 1.5 mag. This epoch and period express the quiescent data well, but eclipses in quiescence were below the detection limit of ZTF. Another short outburst in 2021 May.

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[vsnet-chat 9381] Gaia19bxc: short high state in 2023 Mar.
by Taichi Kato 01 May '23

01 May '23

Gaia19bxc: short high state in 2023 Mar. Possible polar below the period minimum. Again in low state in Apr. according to ATLAS. YYYYMMDD(UT) mag observer 20230219.5062 19.667zr (ZTF Alert DC mag (Masci+ 2019)) 20230313.4894 18.785zg (ZTF Alert DC mag (Masci+ 2019)) 20230318.3677 18.768o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230318.6110 19.062o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230322.3471 19.094o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230326.3238 18.858o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230326.5960 19.179o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230327.5785 19.387o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-chat 9380] ZTF18abtbrfb: ordinary polar
by Taichi Kato 01 May '23

01 May '23

ZTF18abtbrfb: ordinary polar Re: [vsnet-chat 9257] ZTF18abtbrfb: polar below the period minimum? Using the extended ZTF data set, I have confirmed that the double period is the correct one. P=0.0719429(1) d and two strong peaks (1.3 mag and 1.1 mag) per period. Flat part between the peaks. ATLAS data yielded the same period, though faint phases were below the detection limit of ATLAS. All indicate that this object is a polar.

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[vsnet-chat 9379] TCP J18320313+0231103 = ZTFJ183203.16+023109.2: flare
by Taichi Kato 28 Apr '23

28 Apr '23

TCP J18320313+0231103 = ZTFJ183203.16+023109.2: flare 183203.1 +023109 (2000.0) ZTFJ183203.15+023109.1 susp g=19.566 r=17.958 amp=0.189 P=0.0334000 logfalse=-0.300 183203.1 +023109 (2000.0) ZTFJ183203.16+023109.2 r=17.940 (17.106-18.098) P=0.2987 183203.155 +023108.85 (2000.0) Gaia_DR2_4276937955319923328 plx=19.942(0.111) dismod=3.5 pmra=22.242(0.193) pmdec=83.783(0.211) G=16.769 BP=18.998 RP=15.352 183203.156 +023108.89 (2000.0) Gaia_EDR3_4276937955319923328 plx=19.794(0.069) dismod=3.5 pmra=22.431(0.081) pmdec=83.201(0.076) G=16.738 BP=19.036 RP=15.351

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[vsnet-chat 9378] Inight et al.'s SDSS CV paper
by Taichi Kato 27 Apr '23

27 Apr '23

Dear Sebastian and all, Regarding the recent SDSS CVs, Inight, K.; Gaensicke, B.; Breedt, E.; et al., 2023, A catalogue of cataclysmic variables from 20 years of the Sloan Digital Sky Survey with new classifications, periods, trends and oddities 2023arXiv230406749I is very noisy in classification of dwarf novae. They give too many "WZ Sge:" (there are only few "SU UMa:"). Some objects were given "WZ Sge:" even though there have been multiple outbursts in recent years. They probably classified almost short-Porb objects as WZ Sge: I would recommend you to check past activities in adopting their classifications.

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[vsnet-chat 9377] VSOLJ Variable Star Bulletin No.114
by meineko 26 Apr '23

26 Apr '23

No.114 SDSS J094002.56+274942.0: an SU UMa star with an orbital period of3.92 hours and an apparently unevolved secondary Taichi Kato and Tonny Vanmunster http://vsolj.cetus-net.org/bulletin.html Seiichiro Kiyota VSOLJ

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[vsnet-chat 9376] ZTF18aczazlw: AM CVn star with multiple rebrightenings?
by Taichi Kato 25 Apr '23

25 Apr '23

ZTF18aczazlw: AM CVn star with multiple rebrightenings? From ZTF data. Supercycle about a year and with multiple rebrightenings.

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[vsnet-chat 9375] ZTF18abmaqsj orbital period
by Taichi Kato 24 Apr '23

24 Apr '23

ZTF18abmaqsj orbital period From ZTF data. Porb=0.2397762(8) d. Sinusoidal variation and orbital amplitude 0.5 mag (too large for NL and no indication of eclipse). Resembles a reflection-type variable but with other variations.

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[vsnet-chat 9374] ZTF18aaxpgxp: deeply eclipsing polar
by Taichi Kato 24 Apr '23

24 Apr '23

ZTF18aaxpgxp: deeply eclipsing polar From ZTF data. Porb=0.0642228(1) d. Eclipse 1.7 mag. Two maxima per cycle.

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[vsnet-chat 9373] SDSS J094002.56+274942.0: another long-Porb SU UMa star
by Taichi Kato 20 Apr '23

20 Apr '23

SDSS J094002.56+274942.0: another long-Porb SU UMa star ZTF time-resolved data recorded superhumps during the 2019 Feb. outburst. T. Vanmunster's observation also detected 0.3-mag superhump(s) on 2019 Feb. 11. Probably due to the long Porb=0.16352 d, this variation was not regarded as superhump(s). The 2009 outburst (Krajci and Wils JAAVSO 38, 33) was a normal one. The secondary is probably somewhat evolved as reported as a possible spectral class early M-type in Krajci and Wils (2010).

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