May 2023 - vsnet-chat - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-chat 9394] Gaia17aoz: unusual dwarf nova with multiple rebrightenings
by Taichi Kato 14 May '23

14 May '23

Gaia17aoz: unusual dwarf nova with multiple rebrightenings Based on ATLAS and ZTF. Superoutbursts with multiple rebrightenings in 2019-2020 and 2022 (this one was very clear). Rebrightenings longer than in AM CVn stars. The interval less than 3 yr is exceptionally short for a WZ Sge star with multiple rebrightenings.

1 0

[vsnet-chat 9393] ASASSN-18in 2018 outburst
by Taichi Kato 11 May '23

11 May '23

ASASSN-18in 2018 outburst A dwarf-nova outburst was clearly present. The true counterpart a background fainter object? YYYYMMDD(UT) mag observer 20180330.3871 17.537o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180330.4045 17.551o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180330.4064 17.581o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180330.4087 17.272o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180415.4528 15.988o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180415.4594 16.041o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180415.4613 16.026o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180417.4414 16.302c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180417.4503 16.271c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180417.4516 16.322c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180417.4555 16.262c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180417.4647 16.225c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180417.4661 16.314c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180421.4381 16.722o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180421.4462 16.835o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180421.4540 16.732o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180425.4266 16.835o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180425.4325 16.892o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180425.4384 16.950o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180425.4494 16.934o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180507.4019 17.230o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180507.4125 17.233o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180507.4143 17.279o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180507.4262 17.243o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180509.3950 17.361o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180509.3964 17.424o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180509.4080 17.435o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180509.4203 17.404o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180512.4031 17.814c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180512.4099 17.865c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180512.4122 17.803c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180512.4159 17.774c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180513.3678 17.550o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180513.3759 17.554o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180513.3845 17.514o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20180513.3921 17.606o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

1 0

[vsnet-chat 9392] VSOLJ Variable Star Bulletin No.116
by meineko 05 May '23

05 May '23

No.116 The 2022 active state of the AM CVn star NSV 1440 Taichi Kato,　Rod Stubbings http://vsolj.cetus-net.org/bulletin.html Seiichiro Kiyota VSOJ

1 0

[vsnet-chat 9391] ASASSN-18si: double superoutburst
by Taichi Kato 04 May '23

04 May '23

ASASSN-18si: double superoutburst According to ASAS-SN ver.2, this object showed double superoutburst. Considering the large amplitude, this object is likely a WZ Sge star (period bouncer). Berto Monard reported time series data on 2018 Aug. 22 (first outburst) without clear evidence for superhumps.

1 0

[vsnet-chat 9390] ASASSN-15hj: IW And star
by Taichi Kato 04 May '23

04 May '23

ASASSN-15hj: IW And star ATLAS + ASAS-SN ver.2 Typical IW And behavior in 2017. Additional standstills with terminal brightening in recent years.

1 0

[vsnet-chat 9389] ASASSN-18ed identification
by Taichi Kato 04 May '23

04 May '23

ASASSN-18ed identification This one appears to be correct. 130120.4 -413603 (2000.0) Gaia_DR3_6139397368696634240 CV (score=0.43) 130120.482 -413603.70 (2000.0) Gaia_DR2_6139397368696634240 plx=0.874(0.357) dismod=10.3 pmra=-118.292(0.534) pmdec=2.290(0.283) G=17.929 BP=17.231 RP=16.798 130120.477 -413603.70 (2000.0) Gaia_EDR3_6139397368696634240 plx=1.381(0.142) dismod=9.3 pmra=-118.751(0.220) pmdec=1.835(0.103) G=19.019 BP=17.749 RP=17.220

1 0

[vsnet-chat 9388] V1147 Cen: Z Cam star
by Taichi Kato 04 May '23

04 May '23

V1147 Cen: Z Cam star ASAS-SN recorded a standstill in 2022 Mar.-May. The standstill was rising and there was some indication of an IW And-type phenomenon.

1 0

[vsnet-chat 9387] VSOLJ Variable Star Bulletin No.115
by meineko 02 May '23

02 May '23

No.115 2023 Apr. Eclipse observations of V838 Her (Nova Her 1991) during nova eruption Taichi Kato http://vsolj.cetus-net.org/bulletin.html Seiichiro Kiyota VSOLJ

1 0

[vsnet-chat 9386] CRTSJ101545.9+033312 range
by Taichi Kato 02 May '23

02 May '23

CRTSJ101545.9+033312 range https://www.aavso.org/vsx/index.php?view=detail.top&oid=225977 The minimum magnitude was a confusion with a nearby object.

1 0

[vsnet-chat 9385] ASASSN-16gc likely SU UMa star
by Taichi Kato 02 May '23

02 May '23

ASASSN-16gc likely SU UMa star Precursor + superoutburst in 2022 Nov. in ATLAS data. YYYYMMDD(UT) mag observer 20221108.0103 <16.533g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20221109.0190 <16.010g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20221111.0272 18.365o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221111.0344 18.058o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221111.0557 18.078o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221111.7650 <17.477g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20221111.7740 18.669o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221111.7790 18.399o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221111.7903 18.458o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221113.7571 15.263g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20221114.0276 15.445o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221114.0331 15.427o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221114.0362 15.455o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221114.0462 15.463o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221116.7636 17.446c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221116.7672 17.747c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221116.7735 17.590c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221116.7781 17.492c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221116.7881 17.591c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.0195 15.250o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.0222 15.260o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.0272 15.313o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.0408 15.264o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7658 15.281c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7699 15.250c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7731 15.219c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7776 15.284c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7785 15.308c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221119.7930 15.186c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0177 15.688o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0191 14.519o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0209 15.597o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0222 15.716o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0272 15.583o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221122.0372 15.596o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221124.7680 15.924c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221124.7712 15.974c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221124.7775 16.029c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20221124.7930 16.058c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

1 0