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

[vsnet-newvar 9334] 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-newvar 9333] PNV J05222788-6936333
by Naoto Kojiguchi 22 May '22

22 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-newvar 9332] 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-newvar 9331] 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-newvar 9330] 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-newvar 9329] Gaia17cav: UGSU:+E
by Taichi Kato 13 May '22

13 May '22

Gaia17cav: UGSU:+E From ZTF data. Porb=0.0670058(1) d. Eclipse 1.4 mag.

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[vsnet-newvar 9328] MGAB-V872: period
by Taichi Kato 13 May '22

13 May '22

MGAB-V872: period From ZTF data. Porb=0.120052(2) d. Amplitude 0.4 mag.

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[vsnet-newvar 9327] MGAB-V732: polar and period
by Taichi Kato 13 May '22

13 May '22

MGAB-V732: polar and period From ZTF data. Porb=0.0630179(1) d. Two peaks of different amplitude (0.7 mag in total) per cycle. High and low states. 182945.843 +321553.39 (2000.0) Gaia_DR2_4592047847404739968 plx=0.604(0.684) dismod=11.1 pmra=0.601(0.956) pmdec=-8.950(1.727) G=20.339 BP=20.050 RP=19.879 182945.843 +321553.39 (2000.0) Gaia_EDR3_4592047847404739968 plx=1.292(0.293) dismod=9.4 pmra=-0.085(0.290) pmdec=-7.187(0.328) G=20.186 BP=19.935 RP=19.626

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[vsnet-newvar 9326] MGAB-V731: polar and period
by Taichi Kato 13 May '22

13 May '22

MGAB-V731: polar and period From ZTF data. Porb=0.0954179(4) d assuming two peaks per cycle. Half a period is allowed, but would be too exotic. Amplitude 0.25 mag. High and low states. 182733.838 +264653.66 (2000.0) Gaia_DR2_4585338730530417024 plx=0.731(0.485) dismod=10.7 pmra=-5.580(0.809) pmdec=-0.860(1.046) G=19.611 BP=19.641 RP=19.117 182733.838 +264653.66 (2000.0) Gaia_EDR3_4585338730530417024 plx=0.916(0.323) dismod=10.2 pmra=-5.693(0.315) pmdec=-0.532(0.365) G=19.552 BP=19.732 RP=19.053

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[vsnet-newvar 9325] MGAB-V783: polar
by Taichi Kato 13 May '22

13 May '22

MGAB-V783: polar From ZTF data. Porb=0.0947083(1) d. Amplitude 1.3 mag and single peak per cycle. High and low states. 192045.058 +371624.13 (2000.0) Gaia_DR2_2051054519743616512 plx=1.093(0.286) dismod=9.8 pmra=-4.216(0.478) pmdec=-11.123(0.453) G=19.409 BP=19.817 RP=18.875 192045.058 +371624.13 (2000.0) Gaia_EDR3_2051054519743616512 plx=1.089(0.212) dismod=9.8 pmra=-4.553(0.232) pmdec=-10.492(0.269) G=19.276 BP=19.669 RP=18.775 Faint and color is also compatible with a polar.

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