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

[vsnet-campaign-dn 16891] V1108 Her: complex variations

by Taichi Kato

V1108 Her: complex variations Kiyota-san's second night observations on Jan. 25 showed complex variations. Although the observing window was short, this may have been a part of early-superhump variations.

1 day, 1 hour

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[vsnet-campaign-dn 16890] PNVJ06245297+0208207: brightened further, Porb?

by Taichi Kato

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).

1 day, 1 hour

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[vsnet-campaign-dn 16889] PNVJ06245297+0208207: ordinary superhumps (AM CVn, P=0.0352 d)

by Taichi Kato

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.

2 days, 1 hour

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[vsnet-campaign-dn 16888] V1108 Her: early superhumps or superhumps

by Taichi Kato

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.

2 days, 21 hours

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[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.

3 days, 1 hour

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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))

3 days, 20 hours

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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))

3 days, 20 hours

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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 days, 2 hours

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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 days, 2 hours

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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)

5 days, 1 hour

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