May 2022 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 26784] ASASSN-20pv: still bright (AM CVn)
by Taichi Kato 23 May '22

23 May '22

ASASSN-20pv: still bright (AM CVn) YYYYMMDD(UT) mag observer 20220422.0026 14.835g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.0038 15.042g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.2409 15.492g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.2422 15.322g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.2436 15.395g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.606 143 (Rod Stubbings) 20220423.2442 15.314g … [View More]

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[vsnet-alert 26783] ASASSN-22gx: new SU UMa-type dwarf nova
by Taichi Kato 23 May '22

23 May '22

ASASSN-22gx: new SU UMa-type dwarf nova According to observations by Berto Monard on May 21-22, superhumps with a period of 0.0584(2) d and an amplitude of 0.19 mag were detected. Earlier observations on May 14 and 15 by Josch Hambsch did not detected apparent modulations.

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[vsnet-alert 26782] PNV J05222788-6936333
by Naoto Kojiguchi 21 May '22

21 May '22

PNV J05222788-6936333 PNV J05222788-6936333 2022 05 21.8916* 05 22 27.88 -69 36 33.3 12.5 U Dor 9 0 2022 05 21.8916 Discovered by C. Jacques, C. Colesanti, C. Barreto, E. Pimentel, J. Ribeiro, M. Domingues, J. Amancio, L. Amaral, P. Holvorcem, T. Napoleao on behalf of the Brazilian Transient Search - BraTS - at SONEAR Observatory, Oliveira, Brazil in three frames … [View More]

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[vsnet-alert 26781] ASASSN-22ha
by Naoto Kojiguchi 20 May '22

20 May '22

ASASSN-22ha Large amplitude outburst of 8 mag. Possible WZ Sge-type dwarf nova. ASASSN-22ha --- ------- 8:7:59.09 60:26:53.5 2022-05-20.13 12.8 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=21.4, g>17.2 on 2022-05-18.11, g=13.3 on 2022-05-20.13 IDs: 080759.125 +602652.512 PS1_DR1_180531219963628258 g=21.4438(0.068) r=21.4156(0.0563) i=21.545(0.0406) z=--(--) y=--(--) 080759.122 +602652.592 PS1_DR2_180531219963628258 g=21.5517(0.042008) r=21.4654(0.04547) … [View More]

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[vsnet-alert 26780] MASTER OT J172758.09+380021.5 superoutburst
by Taichi Kato 19 May '22

19 May '22

MASTER OT J172758.09+380021.5 superoutburst YYYYMMDD(UT) mag observer 20220507.612 <178C (Mitsutaka Hiraga) 20220507.6432 <161c (Yutaka Maeda) 20220509.3896 18.118zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220509.4527 18.176zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220509.6266 <155C (Masayuki Moriyama) 20220511.4122 18.337zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220513.3880 16.832zr (Zwicky Transient Facility Lasair (Masci+… [View More]

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[vsnet-alert 26779] CM Del fading
by Taichi Kato 19 May '22

19 May '22

CM Del fading Moriyama-san has pointed out that CM Del is very faint. Looks like an event similar to a dip in IW And stars. YYYYMMDD(UT) mag observer 20220502.4547 13.911zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220503.7520 135C (Masayuki Moriyama) 20220507.8237 137C (Masayuki Moriyama) 20220508.4333 14.126zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220508.4722 14.090zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220509.8141 140:C (… [View More]

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[vsnet-alert 26778] XM116HT: period of early superhumps
by Taichi Kato 14 May '22

14 May '22

XM116HT: period of early superhumps Itoh-san, Tamas Tordai, Stephen Brincat, Tonny Vanmunster and Vihorlat Observatory team have reported observations. The period of early superhumps is 0.055839(9) d. The variation is still prominent.

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[vsnet-alert 26777] ASASSN-22gx
by Taichi Kato 13 May '22

13 May '22

ASASSN-22gx ASASSN-22gx --- ------- 18:28:47.09 -74:48:35.5 2022-05-12.15 11.8 SDSS DSS VIZIER ------- CV candidate, matches to GAIA DR2 G=19.9, g>17.7 on 2022-05-10.35, g=12.2 on 2022-05-12.15, g=12.1 on 2022-05-12.31 ASASSN-22gx 20220510.35 <177g ASN ASASSN-22gx 20220512.15 122g ASN ASASSN-22gx 20220512.31 121g ASN In outburst in 2MASS? 2MASS 182847.058 -744834.70 (2000.0) 14.155 14.155 14.175 182847.069 -744834.99 (2000.0) Gaia_DR2_6414712602093478016 plx=2.406(0.475) … [View More]

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[vsnet-alert 26776] ZTF J181732.64+101954.5: ER UMa + Z Cam + IW And
by Taichi Kato 12 May '22

12 May '22

ZTF J181732.64+101954.5: ER UMa + Z Cam + IW And From ZTF data. Supercycle about 56 d before 2020 May. Then long standstill. ER UMa state e.g. 2019 July-Sep. (normal outbursts + superoutburst). In 2019 Mar.-June, two superoutbursts occurred directly from a standstill (like NY Ser), but with the same supercycle. Superhumps with a period of 0.08881(4) d (0.13 mag) were detected during the 2019 June-July superoutburst. IW And state (dip following superoutburst) was recorded in 2018 Mar.-July.

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[vsnet-alert 26771] XM116HT = TCP J14225968+4122545: WZ Sge-type star with prominent early superhumps
by Taichi Kato 12 May '22

12 May '22

XM116HT = TCP J14225968+4122545: WZ Sge-type star with prominent early superhumps Tamas Tordai has reported observations. The object shows double-wave 0.3-mag early superhumps. The period is still somewhat uncertain (0.0557-0.0571 d). Bright WZ Sge stars with large-amplitude early superhumps are rare and observations are encouraged.

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vsnet-alert May 2022