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

[vsnet-alert 26448] ASASSN-13cx outburst
by 前田豊 26 Jul '22

26 Jul '22

UGSU+E ASASSN-13cx outburst. ASASSN-13cx 20211118.57382 151:c Mdy.VSOLJ MAEDA Yutaka Nagasaki Japan

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[vsnet-alert 26496] V485 Cen superoutburst
by Taichi Kato 07 Jun '22

07 Jun '22

V485 Cen superoutburst EI Psc-type object. YYYYMMDD(UT) mag observer 20211218.2709 <168C (Masao Funada) 20211225.3367 14.18C (Masao Funada) 20211227.642 144 (Rod Stubbings) 20211228.658 145 (Rod Stubbings) 20211229.658 145 (Rod Stubbings)

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[vsnet-alert 26793] MGAB-V359: more likely very unusual IP below the period minimum
by Taichi Kato 26 May '22

26 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-alert 26792] ASASSN-22hc
by Taichi Kato 26 May '22

26 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-alert 26791] Re: V482 Cyg fading (since May 1)
by Taichi Kato 24 May '22

24 May '22

Re: V482 Cyg fading (since May 1) Early phase of R CrB-type fading is notoriously difficult to notice visually. Here is the comparison. YYYYMMDD(UT) mag observer 20220415.5439 11.517g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.5452 11.511g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.5464 11.525g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.6268 11.554g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.6281 11.543g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.6293 11.539g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220418.3998 11.553g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220418.4010 11.521g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220418.4023 11.476g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220419.7100 108cG (Yutaka Maeda) 20220423.6060 11.584g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220423.6072 11.587g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220423.6085 11.597g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.4842 11.537g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.4855 11.550g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5062 11.563g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5074 11.562g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5087 11.575g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5408 11.576g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5421 11.554g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5433 11.556g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.4971 11.561g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.4983 11.603g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.4996 11.621g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.5310 11.615g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.5323 11.623g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.5336 11.616g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.4859 11.683g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.4871 11.639g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.4884 11.654g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.5653 11.690g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.5666 11.659g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.5678 11.674g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220505.4526 11.855g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220505.4539 11.876g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220505.4552 11.815g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220505.9701 108 (Jose Ripero) 20220507.9868 108 (Jose Ripero) 20220508.3992 12.067g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220508.4005 11.996g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220508.4018 12.116g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220508.9590 110 (Eddy Muyllaert) 20220509.078 109 (Gary Poyner) 20220511.4713 12.305g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220511.4726 12.321g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220511.4739 12.270g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220511.5409 12.328g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220511.5421 12.342g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220511.5434 12.356g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3077 12.430g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3089 12.368g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3103 12.440g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3552 12.462g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3565 12.428g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3578 12.452g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220515.2920 12.648g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220515.2934 12.586g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220516.4594 12.619g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220516.4608 12.734g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.062 115 (Gary Poyner) 20220521.4143 12.780g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.4155 12.781g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.4168 12.777g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.4567 12.789g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.4580 12.806g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.4592 12.815g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.9819 119 (Eddy Muyllaert) 20220524.149 11.84C (Gary Poyner) 20220524.149 12.02TG (Gary Poyner) 20220524.606 120 (Hiroyuki Maehara)

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[vsnet-alert 26789] V482 Cyg fading (since May 1)
by Patrick Schmeer 24 May '22

24 May '22

V482 Cygni (RCB) https://www.aavso.org/vsx/index.php?view=detail.top&oid=11402 The current fading began in early May 2022 according to ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) data (complete): https://asas-sn.osu.edu/sky-patrol/coordinate/2c766f33-797f-437f-9109-bff0e… AAVSO data: https://app.aavso.org/webobs/results/?star=V482+Cyg Photometric (e.g. V band) and spectroscopic observations are encouraged. The Vmag range in VSX is 10.65 - <14.5. Clear skies, Patrick ------- Gary Poyner wrote on Monday, 23 May 2022 at 15:35:18 UTC: There is a suggestion that the RCB star V482 Cyg may be fading. The star has been pretty much inactive since June 1996 when it faded to magnitude 13.0 and recovered to maximum brightness 12 months later (a deeper fade to magnitude 15.0 occured in 1990). Since then there have been small amplitude variations of 0.5 mag either side of magnitude 11.0. Latest magnitude in the AAVSO database is 11.9mv. Charts are available from both BAAVSS and AAVSO. Further observations are requested. Gary ------------------------------------------------------ Gary Poyner FRAS garypoyner(a)gmail.com www.variablestars.co.uk

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[vsnet-alert 26788] ASASSN-14bp likely superoutburst
by Taichi Kato 23 May '22

23 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-alert 26787] 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-alert 26786] SS UMi superoutburst
by Taichi Kato 22 May '22

22 May '22

SS UMi superoutburst YYYYMMDD(UT) mag observer 20220517.5589 <151c (Yutaka Maeda) 20220517.6916 <167C (Masayuki Moriyama) 20220518.5611 <153c (Yutaka Maeda) 20220521.040 144 (Gary Poyner) 20220521.5408 139cG (Yutaka Maeda) 20220521.5408 139cG (Yutaka Maeda) 20220521.637 142C (Mitsutaka Hiraga)

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[vsnet-alert 26785] ASASSN-13at superoutburst
by Taichi Kato 22 May '22

22 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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