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[vsnet-campaign-dn 17277] MASTER OT J081110.46+660008.5: multiple rebrightening, short superoutburst interval
by Taichi Kato 15 May '23

15 May '23

MASTER OT J081110.46+660008.5: multiple rebrightening, short superoutburst interval Based on ATLAS, ZTF and ASAS-SN. The 2021 superoutburst was followed by multiple rebrightenings. A new superoutburst was found in 2017 in ATLAS and ASAS-SN. This interval was short for a WZ Sge star with multiple rebrightenings.

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[vsnet-campaign-dn 17276] ASASSN-22ak period
by Taichi Kato 15 May '23

15 May '23

ASASSN-22ak period Josch Hambsch has reported additional data with a higher cadence. Although the period is not directly apparent to the eyes, a period analysis using all the data appears to give a consistent period of 0.04128(4) d (amplitude 0.06 mag, slower rise and steeper fade). This period is the same as reported in 2022 Dec. (vsnet-alert 27243). The double period appears to be excluded by the rapid fading in 2022. The small amplitude may have been due to observations more than 10 d after the peak. I suspect that this object is an EI Psc star from this period. The outburst behavior is very unusual.

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[vsnet-campaign-dn 17275] PS1-3PIJ185013.38+242220.2 = DDE 163: unusual object (double outburst)
by Taichi Kato 15 May '23

15 May '23

PS1-3PIJ185013.38+242220.2 = DDE 163: unusual object (double outburst) Using ATLAS data, I noticed that the bright outburst in 2022 Mar.-Apr. was a double outburst peaking at 13.8 on Mar. 28, fading to mag 17 and 3-d outburst again. The overall feature is inconsistent with the suggested SU UMa-type classification. It resemble that of an AM CVn star but without clear rebrightenings (there was some hint of a fading tail). Other outburst were also unusual. The 2021 Feb. one had two peaks (ZTF+ATLAS) and there were other faint complex-shaped outbursts. There were past ZTF time-series data in quiescence without a particular period.

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[vsnet-campaign-dn 17274] V1000 Aql: IW And-type standstill and dip
by Taichi Kato 15 May '23

15 May '23

V1000 Aql: IW And-type standstill and dip Not unprecedented. Long standstill in this object is relatively rare. YYYYMMDD(UT) mag observer 20230403.0968 16.028g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230406.0970 16.045g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230408.4632 16.501zr (ZTF Alert DC mag (Masci+ 2019)) 20230410.3224 16.209g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230410.4215 16.768zr (ZTF Alert DC mag (Masci+ 2019)) 20230413.3067 15.943g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230415.5170 15.934g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230415.8282 <168C (Masayuki Moriyama) 20230417.4558 16.798zr (ZTF Alert DC mag (Masci+ 2019)) 20230417.4818 16.542zg (ZTF Alert DC mag (Masci+ 2019)) 20230419.0709 15.854g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230420.3968 15.674g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230420.4609 16.450zr (ZTF Alert DC mag (Masci+ 2019)) 20230422.3994 15.233g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230422.4586 15.602zg (ZTF Alert DC mag (Masci+ 2019)) 20230424.4166 15.305g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230425.4531 15.952zr (ZTF Alert DC mag (Masci+ 2019)) 20230425.4739 15.827zg (ZTF Alert DC mag (Masci+ 2019)) 20230427.4220 16.959zg (ZTF Alert DC mag (Masci+ 2019)) 20230427.4726 17.869zr (ZTF Alert DC mag (Masci+ 2019)) 20230429.0579 <17.242g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230429.4487 19.249zg (ZTF Alert DC mag (Masci+ 2019)) 20230504.0210 <14.822g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230504.0210 <14.919g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230504.0210 <15.386g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230505.2419 15.488g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230507.2461 16.184g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230510.4626 16.111g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230513.7012 <161C (Masayuki Moriyama)

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[vsnet-campaign-dn 17273] NY Her superoutburst
by Taichi Kato 15 May '23

15 May '23

NY Her superoutburst (ER UMa-like object) YYYYMMDD(UT) mag observer 20230503.4169 18.477zr (ZTF Alert DC mag (Masci+ 2019)) 20230504.3777 <16.992g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230508.3743 15.822g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230509.3606 15.975g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230509.6196 159:c (Yutaka Maeda) 20230510.5690 16.056g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230510.6718 163:C (Masayuki Moriyama) 20230511.0804 15.284g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230511.4629 15.963zg (ZTF Alert DC mag (Masci+ 2019)) 20230511.6454 <151c (Yutaka Maeda) 20230513.6119 <156C (Masayuki Moriyama) 20230514.5432 16.323g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-campaign-dn 17272] ASASSN-17fo possible superoutburst
by Taichi Kato 15 May '23

15 May '23

ASASSN-17fo possible superoutburst (UGSU+E) YYYYMMDD(UT) mag observer 20230510.3665 <17.776g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230510.5396 <142c (Yutaka Maeda) 20230511.5475 <159c (Yutaka Maeda) 20230511.6453 <172C (Masayuki Moriyama) 20230513.5734 16.76C (Masayuki Moriyama) 20230514.3727 16.909g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-campaign-dn 17271] ASASSN-14cf likely superoutburst
by Taichi Kato 15 May '23

15 May '23

ASASSN-14cf likely superoutburst Past ASAS-SN data suggests a supercycle of 250 d, but superoutbursts not always occurred at expected epochs. The current one looks like a super. YYYYMMDD(UT) mag observer 20230508.3274 <17.495g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230509.3043 <17.165g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230510.3375 <17.188g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230513.3741 15.161o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.3768 15.198o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.3972 15.179o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.635 149 (Rod Stubbings)

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[vsnet-campaign-dn 17270] TCP J18460168-4355383: ATLAS detection
by Taichi Kato 14 May '23

14 May '23

TCP J18460168-4355383: ATLAS detection YYYYMMDD(UT) mag observer 20230513.1919 15.766o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.1948 15.740o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.2005 15.781o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-campaign-dn 17269] Gaia17aoz: unusual dwarf nova with multiple rebrightenings
by Taichi Kato 14 May '23

14 May '23

Gaia17aoz: unusual dwarf nova with multiple rebrightenings Based on ATLAS and ZTF. Superoutbursts with multiple rebrightenings in 2019-2020 and 2022 (this one was very clear). Rebrightenings longer than in AM CVn stars. The interval less than 3 yr is exceptionally short for a WZ Sge star with multiple rebrightenings.

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[vsnet-campaign-dn 17268] ASASSN-14hq outburst
by Taichi Kato 14 May '23

14 May '23

ASASSN-14hq outburst Somewhat atypical behavior. Rising to superoutburst? (UGSU+E) YYYYMMDD(UT) mag observer 20230505.0384 16.817g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230505.0384 16.841g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230505.0384 <16.947g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230505.0384 <17.186g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230505.0384 <17.196g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230505.7248 18.197o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.7286 18.416o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.7386 18.239o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.7438 18.245o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230506.7782 14.202g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230506.7782 14.251g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230506.7782 14.313g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230506.7782 14.342g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230508.7277 15.343g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230508.7277 15.489g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230508.7320 15.498o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.7352 15.519o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.7403 15.569o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.7507 17.104o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230510.7078 <17.073g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230510.7091 <17.448g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230511.7084 17.468c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230511.7136 18.073c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230511.7165 17.668c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230511.7278 17.789c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230512.0088 17.258g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230512.0088 <17.239g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230513.435 158 (Rod Stubbings)

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