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

[vsnet-campaign-dn 16887] PNVJ06245297+0208207: likely superhumps

by Taichi Kato

PNVJ06245297+0208207: likely superhumps Accoring to Tonny Vanmunster's observations, this AM CVn object slightly brightened (16.7 mag) on Jan. 23 and showed likely superhumps (period about 0.035 d). Please continue observations. Unfortunately there was no report between Jan. 13 and 22.

4 months, 1 week

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[vsnet-campaign-dn 16886] Re: CSSJ022940.2-030618 possible superoutburst (in mid-Jan.)

by Taichi Kato

Re: CSSJ022940.2-030618 possible superoutburst (in mid-Jan.) Object name = CRTSJ022940.3-030620 Should be a superoutburst with a precursor. YYYYMMDD(UT) mag observer 20230107.1923 16.964zg (ZTF Alert DC mag (Masci+ 2019)) 20230107.2547 16.957zr (ZTF Alert DC mag (Masci+ 2019)) 20230108.8311 17.123o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230108.8342 17.099o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230108.8401 17.047o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230108.8505 17.022o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230112.8246 18.992c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230114.1282 16.835zr (ZTF Alert DC mag (Masci+ 2019)) 20230114.2665 16.415zg (ZTF Alert DC mag (Masci+ 2019)) 20230115.0413 16.539o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230115.0450 16.612o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230115.0501 16.570o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230115.0596 16.512o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230116.2628 16.675o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230116.2664 16.707o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230116.2718 16.730o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230116.2857 16.558o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230116.7972 16.565c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230116.8004 16.577c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230116.8085 16.523c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230116.8322 16.414c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.0418 16.864o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.0477 16.902o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.0508 16.904o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.0522 16.983o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.0594 17.067o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.0621 16.947o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.0626 17.004o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.0853 16.967o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230120.2685 17.160o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230120.2860 17.150o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230120.2900 17.266o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505))

4 months, 2 weeks

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[vsnet-campaign-dn 16885] CSSJ022940.2-030618 possible superoutburst (in mid-Jan.)

by Taichi Kato

CSSJ022940.2-030618 possible superoutburst (in mid-Jan.) Suspected type from ZTF data. YYYYMMDD(UT) mag observer 20230107.1923 16.964zg (ZTF Alert DC mag (Masci+ 2019)) 20230107.2547 16.957zr (ZTF Alert DC mag (Masci+ 2019)) 20230114.1282 16.835zr (ZTF Alert DC mag (Masci+ 2019)) 20230114.2665 16.415zg (ZTF Alert DC mag (Masci+ 2019))

4 months, 2 weeks

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[vsnet-campaign-dn 16884] ASASSN-23ag: new SU UMa-type dwarf nova

by Taichi Kato

ASASSN-23ag: new SU UMa-type dwarf nova Superhumps were present in Hambsch's data on Jan. 23. Growing superhumps were likely present on Jan. 21-22 (Vanmunster and Hambsch). Current amplitude 0.05 mag. Approximate period 0.056 d. The WZ Sge-type is expected from the outburst amplitude and the classification as such may become evident as more data become available.

4 months, 2 weeks

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[vsnet-campaign-dn 16883] ASASSN-14fx: new SU UMa-type dwarf nova

by tonny.vanmunster＠gmail.com

Dear colleagues, I have just finished analysing my unfiltered CCD observations of ASASSN-14fx, obtained on 2023, Jan 23/24 at CBA Extremadura Observatory (Spain) using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies. The resulting light curve clearly shows the presence of regular superhumps with an amplitude of 0.24 mag, establishing ASASSN-14fx as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Generalized-Lomb-Scargle, PDM and Conditional Entropy methods (Peranso 3.0) yields a combined superhump period of 0.0652 +/- 0.0006d. The object was at mag CV = 16.3 on Jan 23rd. 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

4 months, 2 weeks

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[vsnet-campaign-dn 16882] MASTER OT J172758.09+380021.5 likely superoutburst

by Taichi Kato

MASTER OT J172758.09+380021.5 likely superoutburst YYYYMMDD(UT) mag observer 20230102.8771 <147c (Yutaka Maeda) 20230103.8655 <154c (Yutaka Maeda) 20230110.8827 <142c (Yutaka Maeda) 20230120.8694 144cG (Yutaka Maeda) 20230121.2610 14.44cG (Masao Funada)

4 months, 2 weeks

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[vsnet-campaign-dn 16881] ASASSN-14fx outburst

by Taichi Kato

ASASSN-14fx outburst First bright outburst since the 2018 one. YYYYMMDD(UT) mag observer 20230107.5941 <151c (Yutaka Maeda) 20230108.5207 <158c (Yutaka Maeda) 20230108.569 <177C (Mitsutaka Hiraga) 20230108.6123 <166C (Masayuki Moriyama) 20230109.5494 <152c (Yutaka Maeda) 20230110.5468 <158c (Yutaka Maeda) 20230120.5248 <142c (Yutaka Maeda) 20230121.5064 158:c (Yutaka Maeda)

4 months, 2 weeks

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[vsnet-campaign-dn 16880] V1108 Her outburst (first since 2004)

by Taichi Kato

V1108 Her outburst (first since 2004) YYYYMMDD(UT) mag observer 20230121.8929 103cG (Yutaka Maeda) WZ Sge star, but the early phase of the 2004 outburst was not recorded. Not observed in 2023 Jan. by ATLAS and ASAS-SN.

4 months, 2 weeks

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[vsnet-campaign-dn 16879] MASTER OT J064725.70+491543.9 superoutburst

by Taichi Kato

MASTER OT J064725.70+491543.9 superoutburst Known SU UMa star. YYYYMMDD(UT) mag observer 20221231.7576 <151c (Yutaka Maeda) 20230102.7311 <162c (Yutaka Maeda) 20230103.7188 <153c (Yutaka Maeda) 20230104.7140 <144c (Yutaka Maeda) 20230107.3305 17.979zr (ZTF Alert DC mag (Masci+ 2019)) 20230107.7833 <146c (Yutaka Maeda) 20230108.6708 <165C (Masayuki Moriyama) 20230108.7384 <150c (Yutaka Maeda) 20230109.7793 <151c (Yutaka Maeda) 20230110.7574 146:cG (Yutaka Maeda) 20230112.2428 14.255zr (ZTF Alert DC mag (Masci+ 2019)) 20230116.622 137C (Mitsutaka Hiraga) 20230120.7377 141cG (Yutaka Maeda)

4 months, 2 weeks

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[vsnet-campaign-dn 16878] PNVJ06245297+0208207: please continue observations

by Taichi Kato

PNVJ06245297+0208207: please continue observations Still staying around 18 mag. Expected to brighten and show superhumps (superhumps may already be present now). YYYYMMDD(UT) mag observer 20221231.8045 <15.639g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221231.8057 <15.712g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221231.8070 <15.626g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221231.9034 18.797o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221231.9115 18.821o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221231.9183 18.974o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230101.9671 <15.986g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230102.8427 <15.422g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230102.8440 <15.377g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230102.8452 <15.469g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230102.9009 <15.832g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230102.9022 <15.701g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230102.9034 <15.627g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230103.1303 18.350o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230103.1335 18.380o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230104.1302 <15.562g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230104.1314 <15.561g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230104.1326 <15.533g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230104.1605 <15.104g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230104.1618 15.552g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230104.1631 <15.532g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230105.2853 12.320g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230105.2865 12.301g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230105.2878 12.407g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230107.7004 12.35V (Masayuki Moriyama) 20230107.7018 12.16B (Masayuki Moriyama) 20230107.7032 12.16Rc (Masayuki Moriyama) 20230107.7048 12.23Ic (Masayuki Moriyama) 20230108.7298 12.76C (Masayuki Moriyama) 20230109.9929 15.07C (Masao Funada) 20230110.474 16.98C (Hiroshi Itoh) 20230110.4794 16.68V (Katsumi Yoshimoto) 20230110.514 <150 (Hiroyuki Maehara) 20230110.6169 169:C (Masayuki Moriyama) 20230111.633 17.66C (Hiroshi Itoh) 20230112.641 17.48C (Hiroshi Itoh) 20230113.646 17.86C (Hiroshi Itoh) 20230116.590 17.76C (Hiroshi Itoh) 20230120.547 17.92C (Hiroshi Itoh) 20230120.621 <150 (Hiroyuki Maehara)

4 months, 2 weeks

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vsnet-campaign-dn January 2023