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 (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220423.2455 15.455g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220423.2468 15.419g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220424.2435 15.497g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220424.592 144 (Rod Stubbings) 20220425.376 154 (Rod Stubbings) 20220425.592 143 (Rod Stubbings) 20220425.624 144 (Rod Stubbings) 20220428.560 143 (Rod Stubbings) 20220502.610 143 (Rod Stubbings) 20220502.682 143 (Rod Stubbings) 20220503.591 143 (Rod Stubbings) 20220505.562 143 (Rod Stubbings) 20220505.635 144 (Rod Stubbings) 20220505.701 144 (Rod Stubbings) 20220509.599 144 (Rod Stubbings) 20220520.571 144 (Rod Stubbings) 20220521.633 144 (Rod Stubbings) 20220522.553 144 (Rod Stubbings)

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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 with 20 seconds exposure using an astrograph 280mm f/2.2 + CCD unfiltered, with magnitude 12.5 under limiting mag = 17.8. Nothing is visible at this location on the previous frames (limiting mag = 17.8) taken on 2022 01 15.28 UT. Possible Nova in LMC. IDs: 052227.803 -693633.241 Gaia_DR2_4657985010083189504 Plx=-1.4544(0.504) dismod=-- pmRA=0.548(0.87) pmDE=-7.839(1.016) G=18.882(0.0077) BP-RP=0.6908 E(g-r)=-- E(B-V)=-- Ag=-- Ar=-- Ai=-- 052227.794 -693633.230 Gaia_EDR3_4657985010083189504 Plx=-0.0025(0.441) dismod=-- PM=3.36 pmRA=3.262(0.602) pmDE=-0.804(0.583) G=18.912672(0.008123) BP-RP=0.821734 E(g-r)=-- E(B-V)=-- Ag=-- Ar=-- Ai=-- ASASSN Sky Patrol (contaminated): https://asas-sn.osu.edu/sky-patrol/coordinate/12506ea4-7cd9-4af8-8fca-7b5f4… https://asas-sn.osu.edu/sky-patrol/coordinate/3f601dbf-16f0-4dfd-877a-92c28… (Image Subtraction Photometry (Reference flux added)) PNVJ05222788-6936333 20220115.28 <17.8C (BraTS) PNVJ05222788-6936333 20220430.015 <158g ASN PNVJ05222788-6936333 20220501.720 118g ASN PNVJ05222788-6936333 20220502.731 105g ASN PNVJ05222788-6936333 20220503.008 104g ASN PNVJ05222788-6936333 20220504.733 101g ASN PNVJ05222788-6936333 20220505.001 105g ASN PNVJ05222788-6936333 20220506.954 105g ASN PNVJ05222788-6936333 20220508.735 107g ASN PNVJ05222788-6936333 20220509.981 111g ASN PNVJ05222788-6936333 20220510.984 111g ASN PNVJ05222788-6936333 20220511.703 111g ASN PNVJ05222788-6936333 20220512.974 114g ASN PNVJ05222788-6936333 20220513.733 115g ASN PNVJ05222788-6936333 20220514.972 115g ASN PNVJ05222788-6936333 20220515.694 117g ASN PNVJ05222788-6936333 20220516.709 118g ASN PNVJ05222788-6936333 20220517.708 119g ASN PNVJ05222788-6936333 20220518.956 121g ASN PNVJ05222788-6936333 20220519.951 122g ASN PNVJ05222788-6936333 20220521.696 123g ASN PNVJ05222788-6936333 20220521.8916 12.5C (BraTS)

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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) 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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