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

[vsnet-alert 27905] V632 Cyg superoutburst
by Taichi Kato 19 Jul '23

19 Jul '23

V632 Cyg superoutburst YYYYMMDD(UT) mag observer 20230714.9347 <143 (Jose Ripero) 20230715.9799 <143 (Eddy Muyllaert) 20230716.7609 132cG (Yutaka Maeda) 20230716.7965 140C (Masayuki Moriyama) 20230716.9250 <143 (Jose Ripero) 20230717.033 133 (Gary Poyner) 20230717.5403 13.87C (Masayuki Moriyama) 20230717.9556 135 (Eddy Muyllaert) 20230718.010 13.90C (Gary Poyner) This time again, Jose Ripero apparently didn't know the outburst and continued copying earlier observations.

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[vsnet-alert 27904] V2276 Sgr: entered plateau
by Taichi Kato 19 Jul '23

19 Jul '23

V2276 Sgr: entered plateau According to Josch Hambsch's observations. Entered a plateau (or standstill) on July 16 before the ending of the superoutburst. The favored period is 0.01963 d (amplitude 0.05 mag). All the behavior strengthens the AM CVn-type classification. The next superoutburst is expected in October and high-cadence time-resolved photometry during the earliest part of the superoutburst will detect superhumps with larger amplitudes.

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[vsnet-alert 27903] ASASSN-23ff: new SU UMa-type dwarf nova
by Taichi Kato 18 Jul '23

18 Jul '23

ASASSN-23ff: new SU UMa-type dwarf nova Josch Hambsch has reported observations. Superhumps with a period of 0.05667(2) d are clearly present (amplitude 0.18 mag).

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[vsnet-alert 27902] V776 And: superoutburst and superhumps
by Taichi Kato 18 Jul '23

18 Jul '23

V776 And: superoutburst and superhumps Stephen Brincat has reported observations. The object shows superhumps. The period is 0.06611(2) d.

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[vsnet-alert 27901] V2276 Sgr: oscillation-type rebrightening
by Taichi Kato 18 Jul '23

18 Jul '23

V2276 Sgr: oscillation-type rebrightening Josch Hambsch reported further observations. The object is now in an oscillation state, commonly seen in AM CVn-type superoutburst. I obtained a likely period of 0.02019 d, which also appears suitable for an AM CVn star, but requires confirmation since observations are still lacking.

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[vsnet-alert 27900] V2276 Sgr rising
by Taichi Kato 13 Jul '23

13 Jul '23

V2276 Sgr rising Thanks to Josch Hambsch, the rising part (18.2 to 17.2) on July 12 was detected. This object is expected to be an AM CVn star and a higher time resolution is desirable.

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[vsnet-alert 27899] V776 And outburst
by Taichi Kato 13 Jul '23

13 Jul '23

V776 And outburst (Combined magnitudes for ASAS-SN DB). SU UMa star, but the classification from superhumps is not secure. YYYYMMDD(UT) mag observer 20230603.5502 15.861g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230605.5318 16.077g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230606.5288 16.023g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230607.5927 15.982g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230615.5019 15.857g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230615.8117 <145c (Yutaka Maeda) 20230616.740 182C (Mitsutaka Hiraga) 20230617.5367 15.816g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230625.4503 15.906g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230628.4458 15.804g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230630.4735 15.921g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230704.4233 15.778g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.4233 15.845g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.5948 14.033g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230713.1010 135cG (Masao Funada)

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[vsnet-alert 27898] MAXI J1807+132 outburst again
by Taichi Kato 13 Jul '23

13 Jul '23

MAXI J1807+132 outburst again (See ATel #16128) Combined magnitudes for ASAS-SN but clearly in outburst. YYYYMMDD(UT) mag observer 20230704.1507 <16.166g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230704.7692 <15.957g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.7997 16.703g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.4306 16.754o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230708.4335 16.677o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230708.4648 16.659o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230708.4933 16.569o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230709.2188 16.106o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230709.2243 16.140o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230709.2322 16.256o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230709.4637 16.247g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230711.2168 15.920g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230711.2181 15.966g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230711.8895 16.457c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230711.9218 16.472c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230711.9250 16.443c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230711.9453 16.444c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-alert 27897] ATOJ277.8818+42.0389 = SDSS J183131.63+420220.2: ER UMa + Z Cam + AM CVn star
by Taichi Kato 12 Jul '23

12 Jul '23

ATOJ277.8818+42.0389 = SDSS J183131.63+420220.2: ER UMa + Z Cam + AM CVn star The object is currently in superoutburst. Time-resolved photometry is encouraged! YYYYMMDD(UT) mag observer 20230416.5063 17.429c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230416.5090 17.372c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230416.5125 17.388c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230416.5377 17.471c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.5797 17.419c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.5797 17.420c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.5829 17.443c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.5829 17.451c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.6051 17.408c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.6051 17.410c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230418.6232 17.391c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 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)) 20230422.5163 17.192c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230422.5190 17.177c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230422.5222 17.166c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230422.5338 17.138c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230424.4703 17.780zg (ZTF Alert DC mag (Masci+ 2019)) 20230424.5161 17.908c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230424.5189 17.852c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230424.5220 17.842c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230424.5319 17.880c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230424.6286 17.594c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.5161 17.495c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.5184 17.507c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.5216 17.502c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230425.5273 17.581c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.4308 17.156zg (ZTF Alert DC mag (Masci+ 2019)) 20230426.4682 17.559zr (ZTF Alert DC mag (Masci+ 2019)) 20230426.5082 17.266c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.5100 17.370c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.5132 17.317c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.5204 17.235c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.6302 17.807c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.4908 18.398o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.5273 18.764o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230503.4260 17.421zr (ZTF Alert DC mag (Masci+ 2019)) 20230504.3179 17.112o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230504.3300 17.058o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230504.3318 17.073o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230504.3395 17.340o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.5031 17.350o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.5058 17.229o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.5103 17.268o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230505.5158 17.287o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230506.5970 17.258o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230506.6002 17.351o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230506.6153 17.240o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230506.6192 17.283o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.4337 17.312o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.4677 17.293o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.4833 17.343o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.4945 17.276o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.5163 17.340o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.5181 17.329o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.5262 17.389o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230508.5316 17.341o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230511.4679 17.046zg (ZTF Alert DC mag (Masci+ 2019)) 20230512.5983 17.516o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230512.6033 17.459o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230512.6063 17.518o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230512.6158 17.530o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.5383 17.401o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.5428 17.391o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.5714 17.365o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230513.5969 17.472o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.3608 17.029zg (ZTF Alert DC mag (Masci+ 2019)) 20230514.4129 17.501zr (ZTF Alert DC mag (Masci+ 2019)) 20230514.4855 17.215c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.4926 17.203c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.4960 17.247c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230514.5121 17.213c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.3095 18.119o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.3132 18.294o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.3220 18.172o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230516.3378 18.030o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230517.4047 18.079zr (ZTF Alert DC mag (Masci+ 2019)) 20230518.5521 17.582o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.5553 17.615o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.5619 17.637o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230518.5718 17.701o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 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)) 20230522.4786 18.957o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.4804 18.917o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5040 18.598o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5067 18.760o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5072 18.661o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5095 18.697o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5135 18.621o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230522.5342 18.828o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230524.4516 17.181o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230524.4538 17.205o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230524.4916 17.171o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230524.5201 17.063o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230526.4481 17.222o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230526.4763 17.247o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230526.4798 17.294o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230526.4849 17.294o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230527.4943 17.285o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230527.4961 17.285o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230527.4992 17.293o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230527.5266 17.336o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230528.4264 17.333o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230528.4502 17.354o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230528.4532 17.448o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230528.4781 17.279o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230530.4162 17.295o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230601.4238 17.356o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230601.4527 17.399o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230601.4555 17.460o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230601.4605 17.373o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230605.4302 18.071o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230605.4406 17.848o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230605.4455 17.969o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230605.4516 18.171o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230607.4648 18.438o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230607.4865 18.475o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230607.4919 18.434o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230607.4948 18.364o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230609.4511 18.753o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230609.4588 18.706o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230609.4854 18.884o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230611.4227 17.482c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230611.4280 17.322c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230611.4318 17.349c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230611.4417 17.266c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230615.4441 17.050c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230615.4464 16.987c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230615.4491 16.956c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230615.4787 17.013c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230616.4380 17.077c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230616.4410 16.997c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230616.4461 17.080c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230616.4678 17.035c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230617.4240 17.103c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230617.4268 17.060c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230617.4334 17.114c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230617.4432 17.038c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230619.4344 17.093c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230619.4371 17.109c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230619.4421 17.072c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230619.4528 17.109c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230621.4317 17.084c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230621.4331 17.108c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230621.4358 17.125c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230621.4449 17.166c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230622.3975 17.152c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230622.4227 17.325c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230622.4262 17.102c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230622.4517 17.166c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230628.4653 17.490o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230628.4689 17.418o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230628.4835 17.421o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230628.4895 17.485o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230629.4615 17.457o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230629.4642 17.325o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230629.5011 17.445o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230629.5129 17.382o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230701.4337 17.494o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230701.4630 17.279o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230701.4658 17.386o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230701.4713 17.351o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4266 18.011o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4293 18.110o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4660 18.139o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4688 18.077o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4725 18.354o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4730 18.183o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4784 18.173o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230704.4990 18.098o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.4245 17.420o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.4273 17.486o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.4323 17.548o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.4674 17.622o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.4678 17.478o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.4706 17.632o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.4994 17.685o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230705.5298 17.651o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.4264 18.281o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.4609 18.284o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.4636 18.268o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.4677 18.327o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.4688 18.407o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.4711 18.375o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.5066 18.337o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230706.5120 18.723o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.4324 17.762o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.4669 17.683o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.4699 17.663o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230707.4750 17.823o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230709.4205 18.620o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230709.4237 18.364o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230709.4305 18.429o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230709.4406 18.532o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230711.4735 17.148o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230711.4768 17.083o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230711.4843 17.117o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230711.4973 17.145o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230712.4441 16.914c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230712.4477 16.919c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230712.4539 16.885c (ATLAS Forced Photometry (Tonry+2018; Shingles+2021))

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[vsnet-alert 27896] ATOJ277.8818+42.0389 = SDSS J183131.63+420220.2 showing large-amplitude variations
by Taichi Kato 12 Jul '23

12 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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