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

[vsnet-alert 27354] PNVJ06245297+0208207: brightened further, Porb?
by Taichi Kato 27 Jan '23

27 Jan '23

PNVJ06245297+0208207: brightened further, Porb? Itoh-san's new observations indicate that the object further brightened to 12 mag but superhumps have become weaker (amplitude typical for AM CVn stars). Crimean Astrophys. Obs. team also reported the rising part and superhumps were already present on Jan. 21 (good job!). Preliminary analysis of the initial outburst yielded a possible period of 0.03433(4) d. Amplitude 0.02 mag and slower rise (similar to early superhumps).

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[vsnet-alert 27353] PNVJ06245297+0208207: ordinary superhumps (AM CVn, P=0.0352 d)
by Taichi Kato 26 Jan '23

26 Jan '23

PNVJ06245297+0208207: ordinary superhumps (AM CVn, P=0.0352 d) Itoh-san obtained long time-resolved photometry on Jan. 25 and detected singly peaked superhumps. These humps were also present in Tordai's observation on Jan. 24 and Vanmunster's on Jan. 23-24 (doubly humped). Thanks to all these observers, the rising phase of the superoutburst was covered. The superhump period is 0.035185(8) d (stage A+B?). The period is longer than the oribital period of GP Com and the lack of hydrogen lines has been confirmed. Very important finding and object.

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[vsnet-alert 27352] V1108 Her: early superhumps or superhumps
by Taichi Kato 25 Jan '23

25 Jan '23

V1108 Her: early superhumps or superhumps Kiyota-san reported observations on Nov. 24. 0.2-mag variations were recorded. There were two minima within one hour. If they are early superhumps, the amplitude is large. Observations are strongly encouraged.

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[vsnet-alert 27351] PNVJ06245297+0208207: likely superhumps
by Taichi Kato 25 Jan '23

25 Jan '23

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.

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[vsnet-alert 27350] Re: CSSJ022940.2-030618 possible superoutburst (in mid-Jan.)
by Taichi Kato 24 Jan '23

24 Jan '23

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))

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[vsnet-alert 27349] CSSJ022940.2-030618 possible superoutburst (in mid-Jan.)
by Taichi Kato 24 Jan '23

24 Jan '23

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))

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[vsnet-alert 27348] ASASSN-23ag: new SU UMa-type dwarf nova
by Taichi Kato 23 Jan '23

23 Jan '23

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.

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[vsnet-alert 27347] ASASSN-14fx: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 23 Jan '23

23 Jan '23

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

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[vsnet-alert 27346] MASTER OT J172758.09+380021.5 likely superoutburst
by Taichi Kato 23 Jan '23

23 Jan '23

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)

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[vsnet-alert 27345] ASASSN-14fx outburst
by Taichi Kato 23 Jan '23

23 Jan '23

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)

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