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

[vsnet-alert 26869] V618 Sgr fading
by Hiroyuki Maehara 13 Jul '22

13 Jul '22

Kojima-san reported that V618 Sgr started fading. object YYYYMMDD(UT) mag code SGRV618 20220603.609 100c TKo SGRV618 20220626.568 104c TKo SGRV618 20220628.649 106c TKo Observer: Tadashi Kojima (Gunma, Japan) Instruments: f.l.=200mm lens + Canon EOS 6D ASAS-SN light curve (Shappee et al. 2014 and Kochanek et al. 2017): https://asas-sn.osu.edu/sky-patrol/coordinate/a571bdfc-1f1f-4fcb-a039-6a90c…

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[vsnet-alert 26868] VY Aqr superhumps
by Taichi Kato 11 Jul '22

11 Jul '22

VY Aqr superhumps Kiyota-san detected superhumps on July 10. The object was fading on July 8 (precursor). Relatively slow rise, atypical for an SU UMa star. YYYYMMDD(UT) mag observer 20220704.9833 <138 (Eddy Muyllaert) 20220705.9819 <138 (Eddy Muyllaert) 20220707.9896 122 (Eddy Muyllaert) 20220708.0326 118 (Eddy Muyllaert) 20220708.989 10.88C (Gary Poyner) 20220709.7449 105cG (Yutaka Maeda) 20220709.7759 110C (Masayuki Moriyama) 20220709.958 10.81C (Gary Poyner) 20220710.0028 105 (Eddy Muyllaert) 20220710.0432 10.66C (Masao Funada) 20220710.049 105 (Gary Poyner) 20220710.7151 109C (Masayuki Moriyama) 20220710.940 11.24C (Gary Poyner)

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[vsnet-alert 26867] CCD observations of nova PGIR22gjh = AT 2022iev
by Filipp Romanov 06 Jul '22

06 Jul '22

Observer: Filipp Romanov (Russia). Remotely using 0.61-m f/6.5 corrected Dall-Kirkham telescope of Burke-Gaffney Observatory (Canada): PGIR22gjh 20220607.14993 17.060I RFD 0.185 PGIR22gjh 20220601.18200 16.604I RFD 0.120 PGIR22gjh 20220530.19851 16.461I RFD 0.114 PGIR22gjh 20220526.20576 16.539I RFD 0.110 PGIR22gjh 20220524.19425 16.327I RFD 0.091 PGIR22gjh 20220521.19637 15.878I RFD 0.072 PGIR22gjh 20220514.27349 15.469I RFD 0.067 PGIR22gjh 20220513.24472 15.497I RFD 0.064 PGIR22gjh 20220510.22786 15.369I RFD 0.067 PGIR22gjh 20220508.23845 15.250I RFD 0.049 PGIR22gjh 20220506.23326 15.178I RFD 0.051 PGIR22gjh 20220506.23130 15.315I RFD 0.070 PGIR22gjh 20220506.23052 15.175I RFD 0.066 PGIR22gjh 20220506.22975 15.327I RFD 0.105 Animation: https://twitter.com/romanov_filipp/status/1543966861284483074

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[vsnet-alert 26866] Re: TCP J22561804+4109534: new WZ Sge-type dwarf nova
by Taichi Kato 05 Jul '22

05 Jul '22

> The superhump profile shows no signs of a double-waved pattern, and I could > not detect early superhumps in my data. Yet, the large outburst amplitude of > ~7.4 mag, and the long time for superhumps to develop (approx. 9 days) make > this a very likely WZ Sge-type dwarf nova. It would be worth noting that the period 0.065 d is long for a WZ Sge star. If this is indeed a WZ Sge star, it must be a period bouncer. Period bouncers tend to have smaller amplitudes of ordinary superhumps and 0.14 mag seems to be a bit large. I would propose to assign the WZ Sge classification after confirmation of a small Pdot and/or rebrightenings.

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[vsnet-alert 26864] ASASSN-20pv (AM CVn) switching on and off
by Taichi Kato 05 Jul '22

05 Jul '22

ASASSN-20pv (AM CVn) switching on and off Still shows post-superoutburst activity. YYYYMMDD(UT) mag observer 20220621.426 143 (Rod Stubbings) 20220621.458 145 (Rod Stubbings) 20220627.469 154 (Rod Stubbings) 20220628.428 154 (Rod Stubbings) 20220630.399 156 (Rod Stubbings) 20220630.492 154 (Rod Stubbings) 20220702.503 154 (Rod Stubbings) 20220703.449 148 (Rod Stubbings) 20220703.499 145 (Rod Stubbings)

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[vsnet-alert 26863] Re: ASASSN-14gq likely superoutburst
by Taichi Kato 05 Jul '22

05 Jul '22

Re: ASASSN-14gq likely superoutburst Faded rapidly. YYYYMMDD(UT) mag observer 20220702.491 143 (Rod Stubbings) 20220703.471 155 (Rod Stubbings)

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[vsnet-alert 26862] ASASSN-14gq likely superoutburst
by Taichi Kato 04 Jul '22

04 Jul '22

ASASSN-14gq likely superoutburst YYYYMMDD(UT) mag observer 20220702.491 143 (Rod Stubbings)

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[vsnet-alert 26861] CRTS J202857.1-061803 likely superoutburst
by Taichi Kato 04 Jul '22

04 Jul '22

CRTS J202857.1-061803 likely superoutburst Type from ZTF data. YYYYMMDD(UT) mag observer 20220615.4097 <164C (Masao Funada) 20220626.1150 151cG (Masao Funada) 20220629.7143 152:cG (Yutaka Maeda) 20220630.7076 153:cG (Yutaka Maeda) 20220701.2036 158cG (Masao Funada)

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[vsnet-alert 26860] ASASSN-18su superhump period
by Taichi Kato 04 Jul '22

04 Jul '22

ASASSN-18su superhump period Berto Monard, Josch Hambsch and Itoh-san have reported observations. The superhump period is 0.05815(2) d. The amplitude is large (0.23 mag). Ordinary SU UMa star.

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[vsnet-alert 26859] Blazar 1308+326 optical superoutburst
by Stefan Karge 03 Jul '22

03 Jul '22

Blazar 1308+326 (OP +313, AU CVn, B2 1308+32; z=0.997) optical superoutburst object date (UTC) mag comment -------------------------------------------------- 1308+326 20220630.001 13.03C active (1) 1308+326 20220701.913 12.88C active (1) 1308+326 20220701.944 12.95V active (2) 1308+326 20220702.728 13.18V active (3) 1308+326 20220702.767 12.98V active (4) -------------------------------------------------- Brightest optical state ever. Second optical flare in just two month [vsnet-alert 26762]. See also ATel #15476 and ATel #15474. -------------------------------------------------- (1) 30cm-Refl. + CCD + Clear (2) 43cm-Refl. + CCD + V-Johnson (remote) (3) 50cm-Refl. + CCD + V-Johnson (remote) (4) 36cm-Refl. + CCD + V-Johnson (remote) Stefan Karge (SKA) http://quasar.square7.ch/fqm/1308+326.html _______________________________________________

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