May 2023 - vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 17230] ASASSN-22ak: sign of superhump?
by Taichi Kato 03 May '23

03 May '23

ASASSN-22ak: sign of superhump? Josch Hambsch has reported observations. 0.3-mag variations were recorded. The suspected superhump period appears to be longer than the one suspected in 2022 Nov (and longer than that of an AM CVn star). Please continue observations of this very unusual object.

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[vsnet-campaign-dn 17229] Re: MASTER OT J150518.03-143933.6 superoutburst?
by Taichi Kato 02 May '23

02 May '23

Re: MASTER OT J150518.03-143933.6 superoutburst? Rapidly faded? YYYYMMDD(UT) mag observer 20230429.1692 15.863o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230429.1710 15.904o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230429.1743 15.917o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230429.1949 15.914o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230430.6422 147:c (Yutaka Maeda) 20230430.6422 147:c (Yutaka Maeda) 20230430.9364 17.223o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230430.9382 17.389o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230430.9567 17.270o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-campaign-dn 17228] ASASSN-16gc likely SU UMa star
by Taichi Kato 02 May '23

02 May '23

ASASSN-16gc likely SU UMa star Precursor + superoutburst in 2022 Nov. in ATLAS data. YYYYMMDD(UT) mag observer 20221108.0103 <16.533g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20221109.0190 <16.010g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20221111.0272 18.365o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221111.0344 18.058o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221111.0557 18.078o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221111.7650 <17.477g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20221111.7740 18.669o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221111.7790 18.399o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221111.7903 18.458o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221113.7571 15.263g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20221114.0276 15.445o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221114.0331 15.427o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221114.0362 15.455o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221114.0462 15.463o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221116.7636 17.446c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221116.7672 17.747c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221116.7735 17.590c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221116.7781 17.492c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221116.7881 17.591c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.0195 15.250o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.0222 15.260o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.0272 15.313o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.0408 15.264o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7658 15.281c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7699 15.250c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7731 15.219c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7776 15.284c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7785 15.308c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7930 15.186c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0177 15.688o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0191 14.519o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0209 15.597o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0222 15.716o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0272 15.583o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0372 15.596o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221124.7680 15.924c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221124.7712 15.974c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221124.7775 16.029c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221124.7930 16.058c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-campaign-dn 17227] MASTER OT J150518.03-143933.6 superoutburst?
by Taichi Kato 02 May '23

02 May '23

MASTER OT J150518.03-143933.6 superoutburst? Known SU UMa star. YYYYMMDD(UT) mag observer 20230426.6334 <147c (Yutaka Maeda) 20230427.6660 <150c (Yutaka Maeda) 20230430.6422 147:c (Yutaka Maeda) 20230430.6422 147:c (Yutaka Maeda)

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[vsnet-campaign-dn 17226] SDSS J110014.72+131552.1 likely superoutburst
by Taichi Kato 02 May '23

02 May '23

SDSS J110014.72+131552.1 likely superoutburst Known SU UMa star. YYYYMMDD(UT) mag observer 20230425.2193 <18.042g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230426.6032 <156c (Yutaka Maeda) 20230426.605 <175C (Mitsutaka Hiraga) 20230427.6318 <141c (Yutaka Maeda) 20230428.9055 14.252g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230430.6119 130:c (Yutaka Maeda)

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[vsnet-campaign-dn 17225] ASASSN-16ef: helium dwarf nova
by Taichi Kato 01 May '23

01 May '23

ASASSN-16ef: helium dwarf nova Typical AM CVn-type superoutburst in 2021 July-Sep in ZTF and ASAS-SN data. Short main superoutburst, dip, long rebrightening followed by multiple short rebrightenings.

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[vsnet-campaign-dn 17224] SDSS J220818.52+135330.0: dwarf nova
by Taichi Kato 01 May '23

01 May '23

SDSS J220818.52+135330.0: dwarf nova ZTF detected an outburst in 2018 Nov.-Dec. Likely with a rebrightening. The outburst was not as long nor bright as a WZ Sge-type one, and this object is likely an SU UMa star.

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[vsnet-campaign-dn 17223] 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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