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

[vsnet-newvar 10078] Please also observe ASASSN-22ak (southern object)
by Taichi Kato 12 May '23

12 May '23

Please also observe ASASSN-22ak (southern object) Josch Hambsch has been reporting observations. The data, however, were not sampled sufficiently and it is difficult to find a period. There is a suggestion of a period of 0.0453 d (consistent with the rapid fading observed in the 2022 superoutburst?). This object underwent the first-known outburst in 2022 Jan. (long after a dormant period?) and repeated unusual outbursts since then. The current outburst is the fourth one. Although there may be another outburst later in this year, there may be no guarantee since the present activity is a transiently enhanced one (as in V3101 Cyg). So I recommend to observe every outburst as closely as possible.

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[vsnet-newvar 10077] Gaia DR3 2893005857946801152 = ASASSN-23dr: most likely WZ Sge star
by Taichi Kato 12 May '23

12 May '23

Gaia DR3 2893005857946801152 = ASASSN-23dr: most likely WZ Sge star Berto Monard and Josch Hambsch have reported observations. Using Monard's data, there appears to be a period of 0.05452(5) d with a double-peaked profile. The result, however, is preliminary since the amplitude was small (0.03 mag) and observations are still limited. I used the name Gaia DR3 2893005857946801152 since this object was selected as a variable by Gaia (there was probably simply no concept of a dwarf nova in quiescence and was classified as a WD). Please feel free to use ASASSN-23dr since it is much shorter.

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[vsnet-newvar 10076] ASASSN-23dq ALTAS detection
by Taichi Kato 12 May '23

12 May '23

ASASSN-23dq ALTAS detection YYYYMMDD(UT) mag observer 20230508.4955 16.441o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.4996 16.386o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.5047 16.477o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-newvar 10075] MASTER OT J111759.87+765131.6 superoutburst
by Taichi Kato 12 May '23

12 May '23

MASTER OT J111759.87+765131.6 superoutburst YYYYMMDD(UT) mag observer 20230423.4289 <18.233g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230423.4635 <18.508g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230424.2815 <18.894g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230425.4543 <18.314g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230426.574 <172C (Mitsutaka Hiraga) 20230426.5974 <163c (Yutaka Maeda) 20230427.6262 <143c (Yutaka Maeda) 20230501.6171 141cG (Yutaka Maeda) 20230505.2670 14.821g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230507.2470 14.882g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230507.2470 14.887g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230509.3204 15.401g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230510.5334 149cG (Yutaka Maeda)

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[vsnet-newvar 10074] ZTF23aaiqwqg = ATLAS23jua = Gaia23btf: likely WZ Sge star
by Taichi Kato 12 May '23

12 May '23

ZTF23aaiqwqg = ATLAS23jua = Gaia23btf: likely WZ Sge star As judged from the light curve. YYYYMMDD(UT) mag observer 20230501.0844 16.282o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230501.0866 16.218o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230501.0894 16.199o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230501.0968 16.194o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.2965 16.742o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.3015 16.722o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.3028 16.899o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.3033 16.692o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.3065 16.605o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.3119 16.512o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230504.0483 16.977o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230504.0501 17.006o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230504.0528 17.011o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230504.0592 16.925o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.2944 17.154o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.2962 17.073o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.3100 17.304o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.3155 17.167o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230507.0577 17.496o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230507.0608 17.310o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230507.0636 17.443o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230507.0780 17.451o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.2362 17.440o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.2394 17.697o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.2450 17.641o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.2505 17.613o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230509.9939 17.664o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230509.9958 17.845o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230509.9986 17.538o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230511.3923 17.631o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230511.3955 17.602o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230511.4056 17.796o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230511.4065 17.916o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230511.4112 17.748o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-newvar 10073] ASASSN-18ir likely superoutburst
by Taichi Kato 11 May '23

11 May '23

ASASSN-18ir likely superoutburst Likely supercycle around 1.5 yr (ATLAS+ASAS-SN ver2) YYYYMMDD(UT) mag observer 20230428.0703 <17.385g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230428.1142 <18.156g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230501.9907 16.861o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230501.9936 16.933o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.0000 16.937o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.1163 16.377g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230503.1351 16.307g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230503.1464 16.696o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230503.1491 16.679o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230503.1546 16.749o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-newvar 10072] 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))

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[vsnet-newvar 10071] ASASSN-23dr = AT 2023hsr: possible WZ Sge-type dwarf nova
by Naoto Kojiguchi 09 May '23

09 May '23

ASASSN-23dr = AT 2023hsr: possible WZ Sge-type dwarf nova Large outburst amplitude of more than 8 mag. Gaia quiescent absolute magnitude: M_G=+11.8. Possible WZ Sge-type dwarf nova. TNS: https://www.wis-tns.org/object/2023hsr RA/DEC (2000): 06:22:11.124 -32:36:33.84 Reporting Group: ASAS-SN Discovering Data Source: ASAS-SN Discovery Date: 2023-05-08 00:43:12.000 Discovery Mag: 11.5 Filter: g-Sloan Reporter/s: K. Z. Stanek, for the ASAS-SN team IDs: USNO0525.02348016 062210.973 -323633.44 (2000.0) 19.1 19.7 062211.116 -323633.89 (2000.0) Gaia_DR2_2893005857946801152 plx=3.813(0.207) dismod=7.1 pmra=2.423(0.334) pmdec=-0.799(0.381) G=18.974 BP=19.040 RP=18.779 062211.1 -323633 (2000.0) Gaia_DR3_2893005857946801152 plx=3.7645(0.1598) PM=2.359 pmra=2.225(0.168) pmdec=-0.782(0.178) G=18.927(0.004) BP=19.026(0.03) RP=18.864(0.038) 062211.1 -323633 (2000.0) Gaia_DR3_2893005857946801152 WD (score=0.38) 062211.1 -323633 (2000.0) PS1_DR1_68860955463078947 g=-(-) r=-(-) i=19.2525(0.0155) z=-(-) y=-(-) ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/64063544-09e4-46aa-90eb-692e4… ASASSN-23dr 20230506.002 19.397o ATF ASASSN-23dr 20230507.031 <15.873g ASN ASASSN-23dr 20230507.033 <15.723g ASN ASASSN-23dr 20230507.034 <15.740g ASN ASASSN-23dr 20230507.710 14.559o ATF ASASSN-23dr 20230507.716 14.492o ATF ASASSN-23dr 20230507.718 14.434o ATF ASASSN-23dr 20230507.720 14.417o ATF ASASSN-23dr 20230507.730 14.305o ATF ASASSN-23dr 20230507.732 14.284o ATF ASASSN-23dr 20230507.736 14.216o ATF ASASSN-23dr 20230508.030 11.480g ASN ASASSN-23dr 20230508.032 11.448g ASN ASASSN-23dr 20230508.033 11.460g ASN ASASSN-23dr 20230509.020 10.486g ASN ASASSN-23dr 20230509.021 10.492g ASN ASASSN-23dr 20230509.022 10.482g ASN

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[vsnet-newvar 10070] Gaia23bqv: possible SU UMa-type outburst
by Taichi Kato 06 May '23

06 May '23

Gaia23bqv: possible SU UMa-type outburst (but probably already faint) http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia23bqv/ YYYYMMDD(UT) mag observer 20230414.9836 16.712o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230415.0058 16.605o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230415.0098 16.622o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230415.0131 16.606o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.0653 17.338o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.0708 17.424o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.0748 17.367o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.1104 17.410o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230419.2294 17.738c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230419.2326 17.835c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230419.2677 17.654c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230419.3019 17.553c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.3586 18.326c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.3631 18.398c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.3691 18.477c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.3909 18.575c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-newvar 10069] Gaia23brc brightening and fading
by Taichi Kato 06 May '23

06 May '23

Gaia23brc brightening and fading http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia23brc/ Fading seems to be not symmetric (expected for microlensing)m YYYYMMDD(UT) mag observer 20230402.1034 17.485o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230402.1052 17.306o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230402.1080 17.340o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230402.1136 17.855o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230403.2936 17.376o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230403.3059 17.314o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230403.3081 17.554o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230403.3123 17.675o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230405.0541 16.574o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230405.0560 16.304o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230405.0592 16.792o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230405.0799 16.272o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230406.2869 15.883o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230406.2888 15.859o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230406.2917 15.858o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230406.3021 15.625o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230408.0560 14.944o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230408.0579 15.280o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230408.0612 15.061o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230408.0664 15.084o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230409.3067 13.837o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230409.3085 13.855o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230409.3113 13.862o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230409.3221 13.809o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230415.2880 16.394o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230415.2912 16.525o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230415.2941 16.597o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230415.3298 16.462o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230415.4234 17.217o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230417.0505 17.678o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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