October 2022 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 26797] ASASSN-22ho: new SU UMa-type dwarf nova

by tonny.vanmunster＠gmail.com

Dear colleagues, I have just finished analysing my unfiltered CCD observations of ASASSN-22ho, obtained on 2022, June 02/03 at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope and QHY-286M CMOS camera under clear skies. Regular superhumps with an amplitude of 0.35 mag are very clearly visible in the resulting light curve, establishing ASASSN-22ho as a new SU UMa-type dwarf nova. A period analysis using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0), yields a combined (long) superhump period of 0.0902 +/- 0.0025d. The object was at mag CV = 16.5 on Jun 03rd. I will send my observations to AAVSO, CBA and VSNET for further analysis. Best regards Tonny --- Tonny Vanmunster CBA Belgium Observatory CBA Extremadura Observatory http://www.cbabelgium.com PERANSO : The Light Curve and Period Analysis Software http://www.peranso.com

6 months, 1 week

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[vsnet-alert 26960] V381 Lac: brightest ever detected

by Taichi Kato

V381 Lac: brightest ever detected Several observers has noticed this brightening. YYYYMMDD(UT) mag observer 20210803.6329 <142cG (Yutaka Maeda) 20210806.6514 <149cG (Yutaka Maeda) 20210810.5941 <130cG (Yutaka Maeda) 20210820.5618 <161C (Masayuki Moriyama) 20210828.5687 <147cG (Yutaka Maeda) 20210908.7362 154C (Masayuki Moriyama) 20210908.7370 <156V (Masayuki Moriyama) 20210911.6637 153:C (Masayuki Moriyama) 20210914.5012 16.15V (Minoru Sato) 20210919.4885 <139cG (Yutaka Maeda) 20210919.692 138C (Mitsutaka Hiraga) 20210920.4901 15.97V (Minoru Sato) 20210922.4253 <133cG (Yutaka Maeda) 20210923.7509 142C (Masayuki Moriyama) 20210923.7520 155:V (Masayuki Moriyama) 20210928.6755 140C (Masayuki Moriyama) 20210928.6764 15.12V (Masayuki Moriyama) 20210928.6775 13.55Rc (Masayuki Moriyama) 20210928.6784 12.16Ic (Masayuki Moriyama) 20210928.6815 <15.37B (Masayuki Moriyama) 20211001.656 131C (Mitsutaka Hiraga) 20211001.7101 137C (Masayuki Moriyama) 20211001.7106 147V (Masayuki Moriyama) 20211004.5752 <147cG (Yutaka Maeda) 20211007.7087 13.42C (Masayuki Moriyama) 20211007.7087 150:V (Masayuki Moriyama) 20211010.4138 14.66V (Minoru Sato) 20211013.635 126C (Mitsutaka Hiraga) 20211013.7271 132C (Masayuki Moriyama) 20211017.7057 141V (Masayuki Moriyama) 20211019.6298 13.08C (Masayuki Moriyama) 20211019.6317 14.16V (Masayuki Moriyama) 20211023.7075 130C (Masayuki Moriyama) 20211025.628 125C (Mitsutaka Hiraga) 20211026.6401 129C (Masayuki Moriyama) 20211029.5316 140cG (Yutaka Maeda) 20211029.6413 131C (Masayuki Moriyama) 20211030.4275 14.17V (Minoru Sato) 20211101.4979 141:cG (Yutaka Maeda) 20211102.6370 128C (Masayuki Moriyama) 20211102.6379 14.33V (Masayuki Moriyama) 20211103.5404 139:cG (Yutaka Maeda) 20211106.4849 13.99V (Minoru Sato) 20211106.6904 127C (Masayuki Moriyama) 20211107.4731 <124cG (Yutaka Maeda) 20211110.550 142c (Tadashi Kojima) 20211115.6260 125C (Masayuki Moriyama) 20211116.5039 13.73V (Minoru Sato) 20211118.5044 136:cG (Yutaka Maeda) 20211119.6464 125C (Masayuki Moriyama) 20211119.6472 13.85V (Masayuki Moriyama) 20211126.6247 125C (Masayuki Moriyama) 20211126.6256 135V (Masayuki Moriyama) 20211204.4036 138cG (Yutaka Maeda) 20211208.3977 139cG (Yutaka Maeda) 20211213.5845 126C (Masayuki Moriyama) 20211221.5145 129C (Masayuki Moriyama) 20211223.3971 143:cG (Yutaka Maeda) 20211223.487 126C (Mitsutaka Hiraga) 20211231.3889 <146cG (Yutaka Maeda) 20220103.3965 <149cG (Yutaka Maeda) 20220104.5293 147:V (Masayuki Moriyama) 20220104.5301 133C (Masayuki Moriyama) 20220108.3997 <144cG (Yutaka Maeda) 20220127.4834 131C (Masayuki Moriyama) 20220211.4748 131C (Masayuki Moriyama) 20220401.8518 120C (Masayuki Moriyama) 20220418.8004 11.59C (Masayuki Moriyama) 20220418.8014 12.61V (Masayuki Moriyama) 20220419.7881 125V (Masayuki Moriyama) 20220504.7593 114C (Masayuki Moriyama) 20220504.7600 123V (Masayuki Moriyama) 20220507.7700 128cG (Yutaka Maeda) 20220517.6558 12.47V (Minoru Sato) 20220517.7700 126cG (Yutaka Maeda) 20220518.6976 113C (Masayuki Moriyama) 20220518.6995 12.35V (Masayuki Moriyama) 20220531.7200 127cG (Yutaka Maeda) 20220603.8091 12.29V (Masayuki Moriyama) 20220608.6478 12.48V (Minoru Sato) 20220630.633 131c (Tadashi Kojima) 20220701.7484 122V (Masayuki Moriyama) 20220708.6434 12.24V (Minoru Sato) 20220719.7289 119V (Masayuki Moriyama) 20220725.6165 11.88V (Minoru Sato) 20220729.5722 11.92V (Minoru Sato) 20220802.6500 120cG (Yutaka Maeda) 20220805.5827 11.82V (Minoru Sato) 20220807.6500 120cG (Yutaka Maeda) 20220808.7848 113C (Masayuki Moriyama) 20220808.7896 11.67V (Masayuki Moriyama) 20220809.594 118C (Mitsutaka Hiraga) 20220814.4518 11.79V (Minoru Sato) 20220821.6035 11.84V (Minoru Sato) 20220822.7046 116V (Masayuki Moriyama) 20220825.7812 11.64V (Masayuki Moriyama) 20220826.7320 116V (Masayuki Moriyama) 20220828.5231 11.78V (Minoru Sato) 20220904.4461 11.73V (Minoru Sato) 20220910.3961 11.73V (Minoru Sato) 20220914.4012 11.76V (Minoru Sato) 20220916.7247 117V (Masayuki Moriyama) 20220921.4560 11.91V (Minoru Sato) 20220924.482 119c (Tadashi Kojima) 20220926.4529 12.08V (Minoru Sato) 20220927.6681 11.94V (Masayuki Moriyama) 20220929.596 125c (Tadashi Kojima) 20221001.4915 12.16V (Minoru Sato)

7 months, 1 week

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[vsnet-alert 26998] ASASSN-15pj still in outburst

by Taichi Kato

ASASSN-15pj still in outburst YYYYMMDD(UT) mag observer 20221008.4356 16.663zr (ZTF Alert DC mag (Masci+ 2019)) 20221008.5108 17.296zg (ZTF Alert DC mag (Masci+ 2019)) 20221012.3683 15.764zr (ZTF Alert DC mag (Masci+ 2019)) 20221012.6783 157:c (Yutaka Maeda) 20221012.6783 157:c (Yutaka Maeda) 20221013.6846 <155c (Yutaka Maeda) 20221014.6642 <150c (Yutaka Maeda) 20221015.6768 157:c (Yutaka Maeda) 20221017.3726 16.106zr (ZTF Alert DC mag (Masci+ 2019)) 20221018.6800 162:c (Yutaka Maeda)

7 months, 2 weeks

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[vsnet-alert 26997] KIC11390659 fading rapidly

by Taichi Kato

KIC11390659 fading rapidly YYYYMMDD(UT) mag observer 20221012.1327 16.652zg (ZTF Alert DC mag (Masci+ 2019)) 20221012.500 165C (Mitsutaka Hiraga) 20221012.6669 <162C (Masayuki Moriyama) 20221013.6258 163:C (Masayuki Moriyama) 20221015.487 125 (Hiroyuki Maehara) 20221016.826 13.12C (Gary Poyner) 20221016.8263 13.00C (Masao Funada) 20221017.6023 143C (Masayuki Moriyama) 20221018.567 151 (Hiroyuki Maehara)

7 months, 3 weeks

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[vsnet-alert 26996] MN Dra likely superoutburst

by Taichi Kato

MN Dra likely superoutburst YYYYMMDD(UT) mag observer 20221011.3215 20.278zg (ZTF Alert DC mag (Masci+ 2019)) 20221011.3412 18.740zg (ZTF Alert DC mag (Masci+ 2019)) 20221012.5363 <157c (Yutaka Maeda) 20221012.6207 <170C (Masayuki Moriyama) 20221013.1579 20.072zr (ZTF Alert DC mag (Masci+ 2019)) 20221013.1584 19.046zr (ZTF Alert DC mag (Masci+ 2019)) 20221013.2022 19.701zg (ZTF Alert DC mag (Masci+ 2019)) 20221013.2251 19.256zg (ZTF Alert DC mag (Masci+ 2019)) 20221013.5429 <154c (Yutaka Maeda) 20221014.5208 <154c (Yutaka Maeda) 20221014.6231 <165C (Masayuki Moriyama) 20221015.1359 16.725zg (ZTF Alert DC mag (Masci+ 2019)) 20221015.1388 16.818zg (ZTF Alert DC mag (Masci+ 2019)) 20221015.1786 16.649zr (ZTF Alert DC mag (Masci+ 2019)) 20221015.1828 16.569zr (ZTF Alert DC mag (Masci+ 2019)) 20221015.5354 <153c (Yutaka Maeda) 20221017.6507 159:C (Masayuki Moriyama)

7 months, 3 weeks

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[vsnet-alert 26995] CRTSJ035318.1-034847 possible superoutburst

by Taichi Kato

CRTSJ035318.1-034847 possible superoutburst Type from ZTF data. Supercycle about 90 d. YYYYMMDD(UT) mag observer 20221010.3980 18.602zg (ZTF Alert DC mag (Masci+ 2019)) 20221010.4414 19.389zr (ZTF Alert DC mag (Masci+ 2019)) 20221012.3725 17.943zr (ZTF Alert DC mag (Masci+ 2019)) 20221012.4425 18.293zg (ZTF Alert DC mag (Masci+ 2019)) 20221017.1745 15.26C (Masao Funada)

7 months, 3 weeks

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[vsnet-alert 26994] ZTF18abocmat likely superoutburst

by Taichi Kato

ZTF18abocmat likely superoutburst Type from ZTF data. YYYYMMDD(UT) mag observer 20221013.1943 17.028zg (ZTF Alert DC mag (Masci+ 2019)) 20221015.1292 16.127zg (ZTF Alert DC mag (Masci+ 2019)) 20221015.1668 16.351zr (ZTF Alert DC mag (Masci+ 2019))

7 months, 3 weeks

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[vsnet-alert 26993] ZTF18aaqzomm likely superoutburst

by Taichi Kato

ZTF18aaqzomm likely superoutburst Type from ZTF data. Supercycle about 210 d. YYYYMMDD(UT) mag observer 20221012.1327 18.197zg (ZTF Alert DC mag (Masci+ 2019)) 20221013.1303 17.564zr (ZTF Alert DC mag (Masci+ 2019)) 20221013.1802 17.553zg (ZTF Alert DC mag (Masci+ 2019)) 20221014.1392 17.384zg (ZTF Alert DC mag (Masci+ 2019)) 20221015.1421 17.565zg (ZTF Alert DC mag (Masci+ 2019)) 20221015.1764 17.522zr (ZTF Alert DC mag (Masci+ 2019))

7 months, 3 weeks

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[vsnet-alert 26992] Gaia18cqv likely superoutburst

by Taichi Kato

Gaia18cqv likely superoutburst Type from ZTF data. YYYYMMDD(UT) mag observer 20221013.1371 16.818zr (ZTF Alert DC mag (Masci+ 2019)) 20221013.2242 16.688zg (ZTF Alert DC mag (Masci+ 2019)) 20221015.2204 16.931zg (ZTF Alert DC mag (Masci+ 2019))

7 months, 3 weeks

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[vsnet-alert 26991] SDSS J001153.08-064739.1: positive Pdot

by Taichi Kato

SDSS J001153.08-064739.1: positive Pdot Tonny Vanmunster, Josch Hambsch and Filipp Romanov have reported observations. The mean superhump period is 0.10446(2) d. Pdot is positive +8(3)*10^(-5), which is rare for an object in the period gap.

7 months, 3 weeks

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2021

vsnet-alert October 2022