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[vsnet-campaign-dn 17220] 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-campaign-dn 17219] 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-campaign-dn 17218] 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-campaign-dn 17217] 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-campaign-dn 17216] 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-campaign-dn 17215] 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-campaign-dn 17214] 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-campaign-dn 17213] TCP J16064415-1611467: new SU UMa-type dwarf nova
by Taichi Kato 29 Apr '23

29 Apr '23

TCP J16064415-1611467: new SU UMa-type dwarf nova Itoh-san has reported observations. The object showed 0.2-mag variations with a period of 0.06 d. The profile resembles that of evolving ordinary superhumps, but the variations may be early superhumps. Further observations are needed to clarify the nature.

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[vsnet-campaign-dn 17212] FS Aur low state
by Taichi Kato 28 Apr '23

28 Apr '23

FS Aur low state Like 2018 Nov. and 2020 Jan.-Feb. 20230404.0000 16.422o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230404.0073 16.437o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230405.0033 <16.607g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230405.2945 16.163o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230407.2528 16.506o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230407.2564 16.626o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230407.2619 16.672o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230407.2750 16.442o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230407.5583 <152C (Masayuki Moriyama) 20230408.5705 160:C (Masayuki Moriyama) 20230409.2385 16.098o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230409.2417 16.620o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230409.2471 16.556o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230409.2594 16.611o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230409.5732 161:C (Masayuki Moriyama) 20230409.9765 16.499o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230409.9811 16.764o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230409.9881 16.652o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230410.0016 16.615o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230410.2495 16.797g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230410.5522 <151C (Masayuki Moriyama) 20230411.2531 16.721c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230411.2559 16.737c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230411.2626 16.674c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230411.2741 16.755c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230412.4685 <151c (Yutaka Maeda) 20230412.5810 <154C (Masayuki Moriyama) 20230415.2956 17.068c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230415.2995 16.963c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230415.3273 16.697c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230415.3314 16.806c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230416.5678 <152C (Masayuki Moriyama) 20230417.2796 16.786c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230417.2830 16.850c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230417.2934 16.733c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230417.2987 16.800c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230417.5651 <151C (Masayuki Moriyama) 20230418.9690 <16.297g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230421.2928 16.907c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230421.2960 16.841c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230421.3024 16.847c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230426.5171 <162C (Masayuki Moriyama)

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[vsnet-campaign-dn 17211] HS Vir stopped outbursting recently
by Taichi Kato 28 Apr '23

28 Apr '23

HS Vir stopped outbursting recently SU UMa star. Since mid-Feb. YYYYMMDD(UT) mag observer 20230402.5418 149:c (Yutaka Maeda) 20230403.0436 15.716g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230408.5883 <152c (Yutaka Maeda) 20230408.7820 155C (Masayuki Moriyama) 20230409.6046 <148c (Yutaka Maeda) 20230409.7821 158C (Masayuki Moriyama) 20230410.5779 153:c (Yutaka Maeda) 20230412.474 156 (Rod Stubbings) 20230413.4127 15.935g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230413.635 153 (Rod Stubbings) 20230414.1922 15.418g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230414.460 154 (Rod Stubbings) 20230415.4551 15.957g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230415.7350 158C (Masayuki Moriyama) 20230417.6660 <151c (Yutaka Maeda) 20230417.724 155 (Rod Stubbings) 20230417.7985 <129C (Masayuki Moriyama) 20230418.2618 15.875g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230419.2752 15.642g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230419.7387 158C (Masayuki Moriyama) 20230420.4080 15.554g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230421.7875 155:C (Masayuki Moriyama) 20230422.4828 <144c (Yutaka Maeda) 20230423.4481 15.294g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230423.449 155 (Rod Stubbings) 20230426.4729 <145c (Yutaka Maeda) 20230426.7871 157C (Masayuki Moriyama)

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