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

[vsnet-newvar 9340] MGAB-V359: more likely very unusual IP below the period minimum
by Taichi Kato 27 May '22

27 May '22

MGAB-V359: more likely very unusual IP below the period minimum I have analyzed thr ZTF data and confirmed the two periods found by G. Murawski. https://www.aavso.org/vsx/index.php?view=detail.top&oid=1498507 The amplitudes, however, are too large for an AM CVn star. The 0.0351788-d period has an amplitude of 1.5 mag. The 0.0239743-d period has an amplitude of 1.1 mag. The beat period of 0.0756893 d has to maxima per cycle. It is also unusual for an AM CVn star to have a secondary period much shorter than the orbital one. The profile of the light curve is boxy rather than sinusoidal (suggesting emission from magnetic poles). This object looks more likely an IP below the period minimum, but with polar-like large variations like Romanov V48 we suggested. See https://arxiv.org/abs/2204.02598 MGAB-V359 also has a bright ROSAT counterpart: 122016.2 +565454 (2000.0) 2RXP_J122016.3+565455 0.2251P -0.81 -0.41 931030 122016.4 +565451 (2000.0) 1RXPJ122016+5654.8 0.2160 -0.81 -0.43

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[vsnet-newvar 9339] ASASSN-22hc
by Taichi Kato 27 May '22

27 May '22

ASASSN-22hc ASASSN-22hc --- ------- 8:20:29.11 -20:14:15.6 2022-05-22.03 13.71 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=20.8, g>17.6 on 2022-05-20.03, g=14.0 on 2022-05-22.03, g=14.0 on 2022-05-23.02. ASASSN-22hc 20220520.03 <176g ASN ASASSN-22hc 20220522.03 140g ASN ASASSN-22hc 20220523.02 140g ASN

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[vsnet-newvar 9338] ASASSN-14bp likely superoutburst
by Taichi Kato 24 May '22

24 May '22

ASASSN-14bp likely superoutburst YYYYMMDD(UT) mag observer 20220503.4812 <140c (Yutaka Maeda) 20220504.6941 <147C (Masayuki Moriyama) 20220507.4672 <148c (Yutaka Maeda) 20220523.594 143 (Rod Stubbings)

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[vsnet-newvar 9337] XM116HT: ordinary superhumps
by Taichi Kato 23 May '22

23 May '22

XM116HT: ordinary superhumps According to observations by Tamas Tordai on May 22-23, ordinary superhumps were present. They were not apparent a day before.

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[vsnet-newvar 9336] ASASSN-13at superoutburst
by Taichi Kato 23 May '22

23 May '22

ASASSN-13at superoutburst YYYYMMDD(UT) mag observer 20220511.3625 20.186zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220511.4506 19.763zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220514.7069 <158c (Yutaka Maeda) 20220517.6892 <160c (Yutaka Maeda) 20220517.7838 <167C (Masayuki Moriyama) 20220518.6355 141C (Masayuki Moriyama) 20220518.6895 140cG (Yutaka Maeda) 20220518.6896 140cG (Yutaka Maeda) 20220520.1740 14.07C (Masao Funada) 20220521.6647 140cG (Yutaka Maeda)

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[vsnet-newvar 9335] 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-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 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-newvar 9332] 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-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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