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

[vsnet-alert 26752] ASASSN-15sn superoutburst
by Taichi Kato 06 May '22

06 May '22

ASASSN-15sn superoutburst YYYYMMDD(UT) mag observer 20220424.8141 <148c (Yutaka Maeda) 20220502.8248 <156c (Yutaka Maeda) 20220503.8239 150:cG (Yutaka Maeda) 20220503.8240 150:cG (Yutaka Maeda) 20220504.8076 152:c (Yutaka Maeda) 20220504.8076 152:c (Yutaka Maeda)

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[vsnet-alert 26751] AG Hya faded
by Taichi Kato 06 May '22

06 May '22

AG Hya faded No further need for time-resolved photometry. YYYYMMDD(UT) mag observer 20220422.1842 <16.749g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.1855 <16.804g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.1868 <16.900g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220424.2183 16.445g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220424.2196 <17.023g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220424.2208 16.749g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220425.556 160 (Rod Stubbings) 20220428.2269 14.317g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220428.2282 14.312g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220428.2294 14.323g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220428.542 140 (Rod Stubbings) 20220429.1593 14.300g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220429.1606 14.291g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220429.1619 14.300g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.1362 14.308g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.1374 14.307g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.1387 14.303g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.1433 14.312g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.1445 14.307g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.1458 14.321g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220502.1315 14.433g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220502.1328 14.450g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220502.1340 14.508g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220502.607 143 (Rod Stubbings) 20220503.537 146 (Rod Stubbings) 20220504.0252 14.82C (Masao Funada) 20220504.971 14.97C (Gary Poyner) 20220505.482 158 (Rod Stubbings)

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[vsnet-alert 26750] DV Sco possible superoutburst
by Taichi Kato 06 May '22

06 May '22

DV Sco possible superoutburst YYYYMMDD(UT) mag observer 20220424.2646 176C (Masao Funada) 20220427.7179 <159C (Masayuki Moriyama) 20220503.6283 164:C (Masayuki Moriyama) 20220505.510 145 (Rod Stubbings)

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[vsnet-alert 26749] BC UMa superhumps
by Taichi Kato 05 May '22

05 May '22

BC UMa superhumps Itoh-san has reported observations. Superhumps have already well-developed (0.15 mag) with a typical profile.

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[vsnet-alert 26748] BR Lup superoutburst
by Taichi Kato 04 May '22

04 May '22

BR Lup superoutburst YYYYMMDD(UT) mag observer 20220404.2397 <169C (Masao Funada) 20220404.6891 <159C (Masayuki Moriyama) 20220407.7819 <157C (Masayuki Moriyama) 20220409.6810 <156C (Masayuki Moriyama) 20220428.490 138 (Rod Stubbings) 20220503.444 138 (Rod Stubbings)

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[vsnet-alert 26747] ASASSN-16hb rare outburst (AM CVn)
by Taichi Kato 04 May '22

04 May '22

ASASSN-16hb rare outburst (AM CVn) AM CVn star. Outburst since 2016? YYYYMMDD(UT) mag observer 20220418.5890 <159c (Yutaka Maeda) 20220419.5948 <156c (Yutaka Maeda) 20220420.5921 <143c (Yutaka Maeda) 20220424.5978 <159c (Yutaka Maeda) 20220502.5845 149:c (Yutaka Maeda)

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[vsnet-alert 26746] Re: BC UMa (faint) superoutburst (since Apr. 30)
by Taichi Kato 04 May '22

04 May '22

Re: BC UMa (faint) superoutburst (since Apr. 30) So which was correct? Horie-san or Poyner? YYYYMMDD(UT) mag observer 20220427.582 <146 (Hiroyuki Maehara) 20220429.572 127: (Tsuneo Horie) 20220429.953 <160 (Gary Poyner) 20220502.510 131 (Tsuneo Horie) 20220503.490 131 (Tsuneo Horie)

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[vsnet-alert 26745] ASASSN-22gb: new SU UMa-type dwarf nova
by Taichi Kato 04 May '22

04 May '22

ASASSN-22gb: new SU UMa-type dwarf nova Berto Monard has reported time-resolved photometry. The object started to show superhumps on Apr. 31 with a period of 0.05439(6) d (stage A superhumps). Josch Hambsch has also contributed some observations, but not long enough to illustrate superhumps.

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[vsnet-alert 26744] BC UMa (faint) superoutburst (since Apr. 30)
by Patrick Schmeer 03 May '22

03 May '22

BC Ursae Majoris (UGWZ) https://www.aavso.org/vsx/index.php?view=detail.top&oid=37185 Patrick Wiggins reported (already on 2022 April 30) that BC UMa was active in a CCD image that had been taken by him on my request (in the course of our CV monitoring programme) on April 30.430 UT. Unfortunately I checked my inbox only today. ZTF light curve, data, and images (via Lasair): https://lasair.roe.ac.uk/object/ZTF18aalprzj/ UMABC 20220430.227 13.08g ZTF UMABC 20220502.291 13.01g ZTF UMABC 20220502.346 13.02g ZTF Recent ASAS-SN Sky Patrol light curve and data: https://asas-sn.osu.edu/sky-patrol/coordinate/4b5ee7a5-b6c1-4607-9496-b4ba5… UMABC 20220428.3002 <17.41g ASN The previous (super)outburst was also first detected by Wiggins (on 2020 August 16.228 UT, see vsnet-alert 24555). Time-resolved photometry is required. Clear skies, Patrick ------- References: All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol: - Shappee et al., 2014ApJ...788...48S - Kochanek et al., 2017PASP..129j4502K Lasair: - Smith et al., 2019RNAAS...3...26S Zwicky Transient Facility (ZTF): - Masci et al., 2019PASP..131a8003M

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[vsnet-alert 26743] CRTS J164950.4+035835 superhump period
by Taichi Kato 03 May '22

03 May '22

CRTS J164950.4+035835 superhump period Itoh-san, Shugarov's team and Filipp Romanov have reported observations. The superhump period (during the plateau phase) has been confirmed to be 0.06922(3) d (amplitude 0.16 mag). The data in 2015 and 2016 (2017, PASJ 69, 75) were of very limited quality and the present period supersedes the older one.

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