July 2023 - vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 17412] ATOJ277.8818+42.0389 = SDSS J183131.63+420220.2 showing large-amplitude variations
by Taichi Kato 13 Jul '23

13 Jul '23

ATOJ277.8818+42.0389 = SDSS J183131.63+420220.2 showing large-amplitude variations This object has been almost in novalike state in 2017-2022, with a sudden fading similar to AM CVn stars. Apparently much more variable in this season. YYYYMMDD(UT) mag observer 20230420.4230 16.973zg (ZTF Alert DC mag (Masci+ 2019)) 20230420.4746 17.352zr (ZTF Alert DC mag (Masci+ 2019)) 20230422.4469 17.063zg (ZTF Alert DC mag (Masci+ 2019)) 20230424.4703 17.780zg (ZTF Alert DC mag (Masci+ 2019)) 20230426.4308 17.156zg (ZTF Alert DC mag (Masci+ 2019)) 20230426.4682 17.559zr (ZTF Alert DC mag (Masci+ 2019)) 20230503.4260 17.421zr (ZTF Alert DC mag (Masci+ 2019)) 20230511.4679 17.046zg (ZTF Alert DC mag (Masci+ 2019)) 20230514.3608 17.029zg (ZTF Alert DC mag (Masci+ 2019)) 20230514.4129 17.501zr (ZTF Alert DC mag (Masci+ 2019)) 20230517.4047 18.079zr (ZTF Alert DC mag (Masci+ 2019)) 20230519.4528 18.134zr (ZTF Alert DC mag (Masci+ 2019)) 20230521.3666 19.024zg (ZTF Alert DC mag (Masci+ 2019)) 20230521.4234 19.500zr (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-campaign-dn 17411] NSV18024 outburst
by Taichi Kato 13 Jul '23

13 Jul '23

NSV18024 outburst Subtype unknown. There have been outbursts once per year or two in recent years. YYYYMMDD(UT) mag observer 20230629.9795 <14.805g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.9783 <14.674g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230703.9710 <14.717g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230704.9578 <14.533g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230710.6985 <14.700g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230711.357 120 (Rod Stubbings) 20230711.6951 <14.598g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230712.365 127 (Rod Stubbings)

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[vsnet-campaign-dn 17410] V2276 Sgr faded, but will rebrighten
by Taichi Kato 12 Jul '23

12 Jul '23

V2276 Sgr faded, but will rebrighten The short duration of the initial outburst appears to be consistent with the AM CVn type. YYYYMMDD(UT) mag observer 20230705.8343 <16.309g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.8535 <16.794g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230707.0338 15.834o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.0398 15.785o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.0438 15.930o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.0766 15.947o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.3509 15.533g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230707.4367 15.660g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.3381 15.626g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.1767 15.869g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230710.3291 15.99C (Masao Funada) 20230710.8540 16.925g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230710.9285 17.245g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230711.0488 17.584o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230711.0520 17.535o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230711.0576 17.690o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-campaign-dn 17409] V591 Cen superoutburst
by Taichi Kato 12 Jul '23

12 Jul '23

V591 Cen superoutburst (Already well after peak) YYYYMMDD(UT) mag observer 20230627.0844 16.505g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230629.0542 16.453g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.0942 15.149g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.1346 15.138g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230703.0064 14.927g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230704.0445 15.191g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.1020 15.119g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.1261 15.203g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.1085 15.599g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230710.8617 15.626g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230711.1107 15.559g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230711.480 156 (Rod Stubbings)

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[vsnet-campaign-dn 17408] ASASSN-17mj possible superoutburst
by Taichi Kato 12 Jul '23

12 Jul '23

ASASSN-17mj possible superoutburst Type from ASAS-SN(ver2). Precursor+superoutburst in 2019 Oct. YYYYMMDD(UT) mag observer 20230705.7769 16.297g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.7714 16.366g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230707.1696 <15.496g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.1776 15.989g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.0732 14.939g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.0879 14.881g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230710.2584 14.10cG (Masao Funada)

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[vsnet-campaign-dn 17407] ASASSN-16gg likely superoutburst
by Taichi Kato 10 Jul '23

10 Jul '23

ASASSN-16gg likely superoutburst Type from ASAS-SN(ver2)+ATLAS. YYYYMMDD(UT) mag observer 20230623.0415 16.481g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230625.1712 16.604g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230625.2140 16.729g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230628.0950 16.657g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230629.2036 13.745g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.1156 13.887g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.1656 13.803g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230702.9571 13.951g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230704.0617 14.193g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.9074 14.532g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.2168 14.528g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.0535 14.640g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-campaign-dn 17406] CRTS J162619.8-125557 possible outburst
by Taichi Kato 10 Jul '23

10 Jul '23

CRTS J162619.8-125557 possible outburst Can be a noise. UGSU:+E YYYYMMDD(UT) mag observer 20230705.3443 <16.131g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.9503 <16.039g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.2367 <16.916g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.3460 <16.840g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.8613 <16.402g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.2129 <16.645g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.3374 16.785g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.0086 17.173g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-campaign-dn 17405] ASASSN-15im likely superoutburst
by Taichi Kato 10 Jul '23

10 Jul '23

ASASSN-15im likely superoutburst Combined magnitudes, but the phenomenon is real. Type from ASAS-SN DB. Supercycle about 150 d. YYYYMMDD(UT) mag observer 20230625.3131 16.177g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230625.9705 16.574g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230626.0591 16.149g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230626.9640 16.590g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230626.9957 16.742g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230627.0469 16.280g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230628.0241 16.155g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230628.0440 16.096g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230628.0593 16.818g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230628.0593 16.830g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230630.1421 15.136g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230630.1731 15.214g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230630.8416 15.256g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230630.9211 14.881g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.0663 15.158g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.0743 15.047g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.9981 15.319g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230702.0378 14.846g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230702.7841 14.913g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230703.0061 15.318g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230703.7720 15.537g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230704.2761 15.083g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.7618 15.251g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.0262 15.439g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.1891 15.547g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.7363 15.703g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.7635 15.431g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230707.3081 15.541g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.3069 15.470g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.0045 15.590g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-campaign-dn 17404] ASASSN-14cy outburst?
by Taichi Kato 10 Jul '23

10 Jul '23

ASASSN-14cy outburst? Rather noisy data, but could be a real outburst. YYYYMMDD(UT) mag observer 20230701.2490 <16.859g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.8498 <16.476g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.9671 <16.780g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230702.1331 <16.537g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230702.8801 <16.518g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230702.8915 <16.387g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230703.2478 <16.398g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230703.2948 <16.241g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230703.9294 15.805g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230704.1993 <16.376g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230704.9115 <16.900g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230704.9127 <15.794g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.1662 <16.715g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.8459 <16.643g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.0333 <16.387g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.8337 <16.209g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.3183 16.025g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.1847 16.461g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-campaign-dn 17403] V2276 Sgr outburst (AM CVn?)
by Taichi Kato 10 Jul '23

10 Jul '23

V2276 Sgr outburst (AM CVn?) Combined ATLAS+ASAS-SN(ver2) data indicate that this object is clearly a dwarf nova. The 2022 Sep. and 2021 Aug. outbursts showed a dip and rebrightening resembling an AM CVn star. Supercycle is 80-100 d. The object may be similar to MASTER OT J055845.55+391533.4 or MASTER OT J172758.09+380021.5 (see VSOLJ Variable Star Bulletin No. 113). The spectral type DC:, however, by Skiff (see AAVSO VSX) would favor a hydrogen-poor object. The current outburst appears to be a superoutburst and time-resolved photometry is encouraged. YYYYMMDD(UT) mag observer 20230705.8343 <16.309g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.8535 <16.794g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230707.3509 15.533g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230707.4367 15.660g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.3381 15.626g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.1767 15.869g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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vsnet-campaign-dn July 2023