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

[vsnet-alert 27700] TCP J16064415-1611467: new WZ Sge-type dwarf nova
by Taichi Kato 03 May '23

03 May '23

TCP J16064415-1611467: new WZ Sge-type dwarf nova The most recent data by Itoh-san on May 2 (longer run than in the past) seem to show apparent early superhumps. Only the initial data (vsnet-alert 27686) appears to be anomalous. The combined data with Hambsch's (but not ver helpful) has yielded a period of 0.05633(5) d, characteristic double peaks and a full amplitude of 0.07 mag.

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[vsnet-alert 27699] 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-alert 27698] 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-alert 27697] 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-alert 27696] 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-alert 27695] CS Ind outburst
by Taichi Kato 30 Apr '23

30 Apr '23

CS Ind outburst See Kato et al. (2019) PASJ 71, L4 Long normal or superoutburst? YYYYMMDD(UT) mag observer 20230418.1324 17.290o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.1359 17.273o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.1364 17.303o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.1405 17.321o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.1506 17.139o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.1558 17.207o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.1612 17.182o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.1673 17.087o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230419.3703 16.131g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230419.3703 16.394g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230422.3787 16.128g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230422.3787 16.647g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230422.3812 16.184g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230424.3740 16.008g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230424.3740 16.164g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230425.651 122 (Rod Stubbings) 20230427.0675 13.745o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230427.0953 12.451o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230427.1102 12.436o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230428.3583 11.883g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230428.3583 11.958g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230429.501 122 (Rod Stubbings)

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[vsnet-alert 27694] NY Ser no superhumps
by Taichi Kato 30 Apr '23

30 Apr '23

NY Ser no superhumps Kiyota-san reported second-night observations. No superhumps were present on Apr. 28. Not faded since Apr. 27.

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[vsnet-alert 27693] OT J142936.2+322629 = CSS140607:142936+322630 outburst
by Taichi Kato 30 Apr '23

30 Apr '23

OT J142936.2+322629 = CSS140607:142936+322630 outburst SS Cyg type? YYYYMMDD(UT) mag observer 20230420.4744 <17.058g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230421.5384 17.200c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230421.5936 17.097c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230421.6079 17.015c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230421.6164 17.092c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230422.2331 16.664c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230422.2362 16.757c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230422.2414 16.681c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230422.2767 16.722c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230423.3859 16.618c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230423.4214 16.669c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230423.4275 16.663c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230423.4307 16.684c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.4146 16.860c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.4160 16.825c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.4179 16.862c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.4188 16.852c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.4224 16.861c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.4233 16.802c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.4278 16.956c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.4384 16.874c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.2703 16.226g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230426.3917 17.186o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.3946 17.248o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.4090 17.159o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.4145 17.260o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230427.3643 16.656g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230428.1570 17.458o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230428.1593 17.590o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230428.1634 17.549o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230428.508 17.02C (Hiroshi Itoh)

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[vsnet-alert 27692] Re: ASASSN-22ak another outburst (peculiar object)
by Taichi Kato 30 Apr '23

30 Apr '23

Re: ASASSN-22ak another outburst (peculiar object) > YYYYMMDD(UT) mag observer > 20230429.699 152 (Rod Stubbings) The last negative observation by ATLAS was on Apr. 12. Negative in ASAS-SN on Apr. 20.

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[vsnet-alert 27691] ASASSN-22ak another outburst (peculiar object)
by Taichi Kato 30 Apr '23

30 Apr '23

ASASSN-22ak another outburst (peculiar object) Very unusual object with long outbursts with a sharp peark in 2022 Jan. Not seen in outburst before this 2022 event. AM CVn or related star suspected from the rapid fading. Superhumps were not convincingly detected during the 2022 Nov.-Dec. outburst in the late phase. Please make time-resolved photometry quickly since superhumps may be prominent now! YYYYMMDD(UT) mag observer 20230429.699 152 (Rod Stubbings) 225608.826 -683610.36 (2000.0) Gaia_DR2_6384889036384840320 plx=1.412(0.775) dismod=9.3 pmra=-9.696(1.150) pmdec=-9.868(2.265) G=20.470 BP=20.193 RP=20.024 225608.824 -683610.36 (2000.0) Gaia_EDR3_6384889036384840320 plx=2.173(0.608) dismod=8.3 pmra=-10.769(0.549) pmdec=-10.006(0.823) G=20.435 BP=20.399 RP=20.236 See Subject: [vsnet-alert 27224] ASASSN-22ak outburst (V3101 Cyg analog?) Subject: [vsnet-alert 27225] Re: ASASSN-22ak outburst (V3101 Cyg analog?) Subject: [vsnet-alert 27243] ASASSN-22ak period? Subject: [vsnet-alert 27258] ASASSN-22ak: very rapid fading!

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