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

[vsnet-alert 26781] ASASSN-22ha
by Naoto Kojiguchi 21 May '22

21 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) i=21.5728(0.041649) z=21.7294(0.133216) y=22.0424(0.369341) MPChecker: NO DATA ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/330dda91-d001-4ff7-947f-527ed… ASASSN-22ha 20220518.11 <172g ASN ASASSN-22ha 20220520.13 133g ASN

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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+ 2019)) 20220513.4548 18.477zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220514.6343 142:cG (Yutaka Maeda) 20220515.3313 14.213zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220515.3815 14.397zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220517.048 14.27 (Gary Poyner) 20220517.0490 14.42C (Masao Funada) 20220517.6166 143cG (Yutaka Maeda) 20220517.6166 143cG (Yutaka Maeda)

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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 (Masayuki Moriyama) 20220511.4049 15.339zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220511.4625 15.493zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220513.4055 16.369zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220517.8095 15.42C (Masayuki Moriyama)

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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) dismod=8.1 pmra=-3.677(0.604) pmdec=-16.212(1.161) G=19.889 BP=20.079 RP=19.662 182847.068 -744835.00 (2000.0) Gaia_EDR3_6414712602093478016 plx=2.599(0.364) dismod=7.9 pmra=-2.691(0.297) pmdec=-15.721(0.481) G=19.856 BP=20.009 RP=19.581

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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 26774] ASASSN-22gm: superhumps (AM CVn)
by Taichi Kato 12 May '22

12 May '22

ASASSN-22gm: superhumps (AM CVn) Josch Hambsch has reported further observations. The data show 0.2-mag superhumps with a period of 0.0291(2) d. Further observations are strongly encouraged.

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[vsnet-alert 26773] Fading of BC UMa
by Filipp Romanov 11 May '22

11 May '22

I reported my time series observations of BC UMa from images taken remotely using 0.355-m f/6.2 Schmidt-Cassegrain telescope of Abbey Ridge Observatory (Canada): May 6, 2022: http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-obs/95143 May 7, 2022: http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-obs/95148 May 10, 2022: http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-obs/95162 May 11, 2022: http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-obs/95167 I detected the superhumps and noticed that BC UMa is fades rapidly: 2022-05-06 02:53 UT 13.616 CV +/- 0.002 2022-05-07 02:01 UT 13.804 CV +/- 0.002 2022-05-10 02:21 UT 14.853 CV +/- 0.009 2022-05-11 02:59 UT 16.607 CV +/- 0.028 With best regards, Filipp Romanov.

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[vsnet-alert 26772] ASASSN-22gr
by Taichi Kato 11 May '22

11 May '22

ASASSN-22gr ASASSN-22gr --- ------- 15:49:8.51 -62:8:20.1 2022-05-9.24 14.57 SDSS DSS VIZIER ------- CV candidate, matches to GAIA DR2 G=20.5, g>18.3 on 2022-05-01.09, g=17.3 on 2022-05-02.18, g=14.9 on 2022-05-09.23, g=15.2 on 2022-05-10.26 ASASSN-22gr 20220501.09 <183g ASN ASASSN-22gr 20220502.18 173g ASN ASASSN-22gr 20220509.23 149g ASN ASASSN-22gr 20220510.26 152g ASN

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