April 2023 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 27039] GX Cas (UGSU) outburst
by Kirill Sokolovsky 20 Aug '23

20 Aug '23

The UGSU-type dwarf nova GX Cas is in outburst according to NMW survey photometry (135mm f/2.0 lens + unfiltered ST-8300M CCD): 2022-11-13.7397 2459897.2397 13.4 CV AAVSO observer KLO reports visual observation of this outburst: 2022-11-12.9520 2459896.4520 13.6 Vis. ASAS-SN photometry (latest observation is quiescence on 2022-11-12.165): https://asas-sn.osu.edu/sky-patrol/coordinate/7c8f8333-01a3-49aa-ba14-08b07… VSX record for GX Cas https://www.aavso.org/vsx/index.php?view=detail.top&oid=6537 Best wishes, Kirill Sokolovsky, Stanislav Korotkiy, Olga Smolyankina, Anna Prokudina, Sergei Ostapenko

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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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[vsnet-alert 27690] ASASSN-19hr superhumps
by Taichi Kato 29 Apr '23

29 Apr '23

ASASSN-19hr superhumps Tamas Tordai detected well-developed superhumps on Apr. 25. YYYYMMDD(UT) mag observer 20230412.7427 <150c (Yutaka Maeda) 20230416.4147 13.305g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230416.7384 <154c (Yutaka Maeda) 20230417.7544 <151c (Yutaka Maeda) 20230418.4894 13.538g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230420.2767 13.881g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230420.4306 13.824g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230421.7763 154:c (Yutaka Maeda) 20230421.7763 154:c (Yutaka Maeda) 20230422.4298 13.940g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230422.7504 <158c (Yutaka Maeda) 20230423.1943 14.10C (Masao Funada) 20230426.7493 <159c (Yutaka Maeda) 20230427.7791 <146c (Yutaka Maeda) 20230427.8216 149C (Masayuki Moriyama)

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[vsnet-alert 27689] V1239 Her superoutburst
by Taichi Kato 29 Apr '23

29 Apr '23

V1239 Her superoutburst UGSU+E YYYYMMDD(UT) mag observer 20230422.6881 <161c (Yutaka Maeda) 20230424.3602 16.477g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230425.9382 <143 (Eddy Muyllaert) 20230426.6758 140cG (Yutaka Maeda) 20230426.7804 143C (Masayuki Moriyama) 20230427.7074 137cG (Yutaka Maeda) 20230428.2956 14.324g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-alert 27688] TCP J06093784+3046519: fading and rebrightening
by Taichi Kato 29 Apr '23

29 Apr '23

TCP J06093784+3046519: fading and rebrightening The behavior suggests an AM CVn star. Although time-resolved photometry has been reported, I could not find a convincing superhump period (rather low S/N and variations did not agree well between different observers). YYYYMMDD(UT) mag observer 20230413.4442 14.02C (Masayuki Moriyama) 20230413.4455 13.68B (Masayuki Moriyama) 20230413.4466 13.93V (Masayuki Moriyama) 20230413.4477 13.66Rc (Masayuki Moriyama) 20230413.4488 13.54Ic (Masayuki Moriyama) 20230413.4522 13.962B (Yasuo Sano) 20230413.4528 13.864V (Yasuo Sano) 20230413.4562 14.229Rc (Yasuo Sano) 20230413.4577 14.025C (Yasuo Sano) 20230414.4476 14.097B (Yasuo Sano) 20230414.4496 14.068V (Yasuo Sano) 20230414.4516 14.426Rc (Yasuo Sano) 20230414.4536 14.269C (Yasuo Sano) 20230417.5439 14.70C (Masayuki Moriyama) 20230422.435 17.46C (Hiroshi Itoh) 20230426.5370 <161C (Masayuki Moriyama) 20230427.5266 15.40C (Masayuki Moriyama)

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[vsnet-alert 27687] NY Ser likely superoutburst
by Taichi Kato 29 Apr '23

29 Apr '23

NY Ser likely superoutburst Kiyota-san's data were still flat on Apr. 27. YYYYMMDD(UT) mag observer 20230421.976 <154 (Pavol A. Dubovsky) 20230422.6359 <150c (Yutaka Maeda) 20230422.7883 <166C (Masayuki Moriyama) 20230426.6233 148cG (Yutaka Maeda) 20230426.6233 148cG (Yutaka Maeda) 20230426.7585 152C (Masayuki Moriyama) 20230427.6562 144:c (Yutaka Maeda) 20230427.7757 150C (Masayuki Moriyama) 20230428.1741 14.863g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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vsnet-alert April 2023