January 2023 - vsnet-newvar - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-newvar 9747] ZTF J043616.39+562824.3 = TCP J04361641+5628241 superhump period
by Taichi Kato 31 Jan '23

31 Jan '23

ZTF J043616.39+562824.3 = TCP J04361641+5628241 superhump period Tonny Vanmunster and Kiyota-san have reported observations. The superhump period appears to be 0.08040(3) d (amplitude 0.29 mag). Other aliases are possible, but less likely.

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[vsnet-newvar 9746] ASASSN-20kt: rare, bright outburst
by Taichi Kato 29 Jan '23

29 Jan '23

ASASSN-20kt: rare, bright outburst YYYYMMDD(UT) mag observer 20230107.066 <16.20C (Gary Poyner) 20230107.0662 <175C (Masao Funada) 20230108.2355 <177C (Masao Funada) 20230124.2658 17.148zg (ZTF Alert DC mag (Masci+ 2019)) 20230124.2735 16.917zr (ZTF Alert DC mag (Masci+ 2019)) 20230125.3326 16.360zr (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-newvar 9745] ASASSN-23af: superhump period
by Taichi Kato 28 Jan '23

28 Jan '23

ASASSN-23af: superhump period Due to the short visibility, the superhump period has not yet been pinned down. The most likely period is 0.06076(4) d (allowing aliases). The waveform was clear and there is no ambiguity in classification. The amplitude is small (0.12 mag) and this object may show multiple rebrightenings. Observers: Josch Hambsch and Berto Monard

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[vsnet-newvar 9744] ASASSN-23ag: superhump period
by Taichi Kato 28 Jan '23

28 Jan '23

ASASSN-23ag: superhump period Using data since Jan. 23, the superhump period is 0.05509(3) d (amplitude 0.22 mag). Observers: Itoh-san, Tonny Vanmunster and Josch Hambsch.

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[vsnet-newvar 9743] 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-newvar 9742] 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-newvar 9741] 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-newvar 9740] 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-newvar 9739] 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-newvar 9738] ASASSN-23ag: new SU UMa-type dwarf nova
by Taichi Kato 24 Jan '23

24 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-newvar January 2023