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

[vsnet-alert 26803] U Sco eruption confirmed
by tonny.vanmunster＠gmail.com 06 Jun '22

06 Jun '22

Dear all, I have pleasure confirming the eruption of U Sco. Using a 40-cm f/5.1 telescope and SX-46 CCD camera at CBA Extremadura Observatory (Spain), I obtained 15 V-band exposures of U Sco, yielding following average magnitude: 2022 Jun 06.886 UT, V = 8.71 Congrats to Masayuki-san with this detection. Best regards Tonny Tonny Vanmunster CBA Belgium Observatory CBA Extremadura Observatory www.cbabelgium.com www.peranso.com -----Original Message----- From: Patrick Schmeer via vsnet-outburst <vsnet-outburst(a)ooruri.kusastro.kyoto-u.ac.jp> Sent: Monday, 6 June 2022 21:41 To: vsnet-alert(a)ooruri.kusastro.kyoto-u.ac.jp; vsnet-outburst(a)ooruri.kusastro.kyoto-u.ac.jp; cvnet-outburst(a)groups.io; baavss-alert(a)groups.io Subject: [vsnet-outburst 28764] U Sco eruption (not yet confirmed): recent ASAS-SN Sky Patrol data U Scorpii (NR) https://www.aavso.org/vsx/index.php?view=detail.top&oid=32820 Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) light curve and data: https://asas-sn.osu.edu/sky-patrol/coordinate/93c6536d-22e4-4a75-8ced-7997e… SCOU 20220605.8889 <17.41g ASN No minor planet brighter than mag. 15 was was within a radius of 1° on 2022 June 6.72 UT. Eruptions [sic] occur every 10 +/-2 years. The previous one was detected on 2010 January 28. Confirmation of the current eruption, spectroscopy and multiband as well as time-resolved photometry are urgently required. Clear skies, Patrick ------- Masayuki Moriyama wrote on Monday, 6 June 2022 at 18:55:54 UTC; U Sco outburst!! SCOU 20220606.56664 <173C Myy.VSOLJ SCOU 20220606.72030 114C Myy.VSOLJ observer: M. Moriyama (Sasebo, Nagasaki, Japan) instruments: 25cmSCT(F10)+ x0.63 Reducer +ST-10XME

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[vsnet-alert 26799] U Sco outburst
by Hiroyuki Maehara 06 Jun '22

06 Jun '22

Moriyama-san has reported that U Sco is in outburst. Follow-up observations are urgently required. SCOU 20220606.56582 <173C Myy.VSOLJ SCOU 20220606.72030 114C Myy.VSOLJ Observer: M.Moriyama(Nagasaki, Japan) Instruments : 25cmSCT + ST-10XME

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[vsnet-alert 26801] U Sco eruption (not yet confirmed): recent ASAS-SN Sky Patrol data
by Patrick Schmeer 06 Jun '22

06 Jun '22

U Scorpii (NR) https://www.aavso.org/vsx/index.php?view=detail.top&oid=32820 Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) light curve and data: https://asas-sn.osu.edu/sky-patrol/coordinate/93c6536d-22e4-4a75-8ced-7997e… SCOU 20220605.8889 <17.41g ASN No minor planet brighter than mag. 15 was was within a radius of 1° on 2022 June 6.72 UT. Eruptions [sic] occur every 10 +/-2 years. The previous one was detected on 2010 January 28. Confirmation of the current eruption, spectroscopy and multiband as well as time-resolved photometry are urgently required. Clear skies, Patrick ------- Masayuki Moriyama wrote on Monday, 6 June 2022 at 18:55:54 UTC; U Sco outburst!! SCOU 20220606.56664 <173C Myy.VSOLJ SCOU 20220606.72030 114C Myy.VSOLJ observer: M. Moriyama (Sasebo, Nagasaki, Japan) instruments: 25cmSCT(F10)+ x0.63 Reducer +ST-10XME

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[vsnet-alert 26798] U Sco outburst!!
by Masayuki Moriyama 06 Jun '22

06 Jun '22

U Sco outburst!! SCOU 20220606.56664 <173C Myy.VSOLJ SCOU 20220606.72030 114C Myy.VSOLJ observer : M.Moriyama(Sasebo,Nagasaki,Japan) instruments : 25cmSCT(F10)+ x0.63 Reducer +ST-10XME

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[vsnet-alert 26795] ASASSN-16eg: outburst or noise?
by Taichi Kato 03 Jun '22

03 Jun '22

ASASSN-16eg: outburst or noise? YYYYMMDD(UT) mag observer 20220521.5911 <163c (Yutaka Maeda) 20220522.6073 <154c (Yutaka Maeda) 20220527.6262 <159c (Yutaka Maeda) 20220601.6274 128c (Yutaka Maeda)

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[vsnet-alert 26794] ASASSN-22ha: new most likely WZ Sge-type dwarf nova
by Taichi Kato 03 Jun '22

03 Jun '22

ASASSN-22ha: new most likely WZ Sge-type dwarf nova According to observations by Itoh-san on June 2, this object showed 0.15-mag superhumps (period around 0.06 d or slightly shorter). Considering the long-waiting time and large amplitude, this object is most likely a WZ Sge-type dwarf nova.

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[vsnet-alert 26793] 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-alert 26792] 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-alert 26791] Re: V482 Cyg fading (since May 1)
by Taichi Kato 25 May '22

25 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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