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

[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 26810] ASASSN-22hc: new SU UMa-type dwarf nova
by Taichi Kato 07 Jun '22

07 Jun '22

ASASSN-22hc: new SU UMa-type dwarf nova Berto Monard and Josch Hambsch have reported observations. The object started to show superhumps on May 31 and the period is 0.05633(2) d (amplitude 0.22 mag).

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[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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