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

[vsnet-newvar 10040] 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)

1 0

[vsnet-newvar 10039] 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.

1 0

[vsnet-newvar 10038] 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!

1 0

[vsnet-newvar 10037] 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)

1 0

[vsnet-newvar 10036] 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)

1 0

[vsnet-newvar 10035] 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.

1 0

[vsnet-newvar 10034] CRTSJ105550.1+095621: relatively rapid fading
by Taichi Kato 28 Apr '23

28 Apr '23

CRTSJ105550.1+095621: relatively rapid fading Data by Josch Hambsch. 0.4 mag fading per day. Probably unlikely superhumps.

1 0

[vsnet-newvar 10033] TCP J18320313+0231103 = ZTFJ183203.16+023109.2: flare
by Taichi Kato 28 Apr '23

28 Apr '23

TCP J18320313+0231103 = ZTFJ183203.16+023109.2: flare 183203.1 +023109 (2000.0) ZTFJ183203.15+023109.1 susp g=19.566 r=17.958 amp=0.189 P=0.0334000 logfalse=-0.300 183203.1 +023109 (2000.0) ZTFJ183203.16+023109.2 r=17.940 (17.106-18.098) P=0.2987 183203.155 +023108.85 (2000.0) Gaia_DR2_4276937955319923328 plx=19.942(0.111) dismod=3.5 pmra=22.242(0.193) pmdec=83.783(0.211) G=16.769 BP=18.998 RP=15.352 183203.156 +023108.89 (2000.0) Gaia_EDR3_4276937955319923328 plx=19.794(0.069) dismod=3.5 pmra=22.431(0.081) pmdec=83.201(0.076) G=16.738 BP=19.036 RP=15.351

1 0

[vsnet-newvar 10032] ASASSN-23df ATLAS detection
by Taichi Kato 28 Apr '23

28 Apr '23

ASASSN-23df ATLAS detection Fainter outburst in 2019 Jan. in ATLAS? YYYYMMDD(UT) mag observer 20230426.7416 16.815o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230426.7447 16.796o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230426.7504 16.893o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505))

1 0

[vsnet-newvar 10031] MASTER OT J172758.09+380021.5 likely superoutburst
by Taichi Kato 28 Apr '23

28 Apr '23

MASTER OT J172758.09+380021.5 likely superoutburst Unusual ER UMa-like object. See also https://arxiv.org/abs/2304.07695 YYYYMMDD(UT) mag observer 20230416.6745 <149c (Yutaka Maeda) 20230416.8091 <145C (Masayuki Moriyama) 20230417.4991 17.983g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230417.6905 <154c (Yutaka Maeda) 20230421.7121 <157c (Yutaka Maeda) 20230422.6860 <160c (Yutaka Maeda) 20230426.6738 145cG (Yutaka Maeda) 20230426.7837 147C (Masayuki Moriyama)

1 0