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

[vsnet-alert 27292] Z Cam: oscillations before the termination of standstill
by Taichi Kato 08 Jan '23

08 Jan '23

Z Cam: oscillations before the termination of standstill It would be worth noting that there were low-amplitude oscillations since 2022 Oct., but without gradual brightening seen in IW And stars. The disk apparently started becoming thermally unstable before the termination of the standstill. Oscillations were also seen for a month after entering this standstill (2022 Apr.).

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[vsnet-alert 27291] V1024 Per faded (precursor?)
by Taichi Kato 07 Jan '23

07 Jan '23

V1024 Per faded (precursor?) YYYYMMDD(UT) mag observer 20230102.549 157C (Mitsutaka Hiraga) 20230102.5874 <157c (Yutaka Maeda) 20230102.821 <147 (Gary Poyner) 20230102.8542 <141 (Eddy Muyllaert) 20230103.544 164C (Mitsutaka Hiraga) 20230103.5769 153:c (Yutaka Maeda) 20230104.5719 117cG (Yutaka Maeda) 20230104.6940 125C (Masayuki Moriyama) 20230104.867 121 (Gary Poyner) 20230105.937 13.01C (Gary Poyner) 20230106.853 13.69C (Gary Poyner)

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[vsnet-alert 27290] MASTER OT J021216.01+461154.5: no superhumps
by Taichi Kato 07 Jan '23

07 Jan '23

MASTER OT J021216.01+461154.5: no superhumps Tonny Vanmunster and Tamas Tordai reported observations on two nights. No superhumps were detected (at least as of now).

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[vsnet-alert 27289] Highly variable high state of CM Phe
by Taichi Kato 07 Jan '23

07 Jan '23

Highly variable high state of CM Phe Recent ATLAS observations are given. The object was in relatively low state with dwarf nova outbursts in 2018-2021. High state similar to the current one was seen before 2018 in the ASAS-SN data. YYYYMMDD(UT) mag observer 20221126.8209 15.029c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221126.8241 15.109c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221126.8305 15.171c (ATLAS Forced Photometry (Tonry+2018, … [View More]PASP 130, 064505)) 20221126.8424 15.286c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221129.0762 14.923o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221129.0803 14.834o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221129.0866 14.856o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221129.0974 14.736o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221130.8079 14.811o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221130.8110 14.811o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221130.8169 14.807o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221130.8205 14.831o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221130.8236 14.762o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221130.8268 14.751o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221130.8308 14.790o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221130.8408 14.812o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221203.0656 15.065o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221203.0683 15.088o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221203.0733 15.110o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221203.0828 15.119o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221204.8105 15.188o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221204.8237 15.167o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221204.8270 15.138o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221204.8325 15.158o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221204.8381 15.025o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221204.8409 15.139o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221204.8470 15.123o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221204.8571 15.049o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221207.0875 15.335o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221207.0929 15.269o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221207.0965 15.157o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221207.1189 15.242o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221208.7862 15.077o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221208.7929 15.069o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221208.7961 15.104o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221208.8088 14.927o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221208.8106 15.131o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221208.8161 15.261o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221208.8192 15.230o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221208.8307 15.208o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221211.0518 14.947o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221211.0609 14.939o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221211.0641 15.003o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221211.0740 15.082o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221215.0557 15.896c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221215.0612 15.746c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221215.0644 15.700c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221215.0746 15.775c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221219.0450 16.108c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221219.0480 16.086c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221219.0534 15.943c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221219.0699 15.909c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221220.7908 15.474o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221220.7941 15.435o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221220.7995 15.515o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221220.8097 15.538o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221223.0477 15.727c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221223.0513 15.661c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221223.0577 15.555c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221223.0685 15.643c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221227.0372 15.796c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221227.0403 16.042c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221227.0458 16.055c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221227.0650 16.055c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221231.0355 15.393o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221231.0386 15.482o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221231.0625 15.333o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) [View Less]

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[vsnet-alert 27288] CS Ind: observations on Jan. 4
by Taichi Kato 07 Jan '23

07 Jan '23

CS Ind: observations on Jan. 4 Observations by Filipp Romanov obtained a rather flat light curve (but only for 1 hr and it would be difficult to exclude the presence of superhumps).

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[vsnet-alert 27287] PNVJ06245297+0208207: no apparent superhumps yet
by Taichi Kato 07 Jan '23

07 Jan '23

PNVJ06245297+0208207: no apparent superhumps yet Tamas Tordai has reported observations. No large-amplitude superhumps were present and this object is likely a helium WZ Sge star with a low inclination.

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[vsnet-alert 27286] ATLAS17kol likely superoutburst
by Taichi Kato 07 Jan '23

07 Jan '23

ATLAS17kol likely superoutburst Type from ZTF data. http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia23acc/ Gaia23acc AT2023au 2023-01-03 09:45:23 15.52831 1.27574 16.93 CV 2023-01-05 07:21:51 Outburst in confirmed CV

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[vsnet-alert 27285] ASASSN-15cl likely superoutburst
by Taichi Kato 07 Jan '23

07 Jan '23

ASASSN-15cl likely superoutburst Known SU UMa star. Last superoutburst in 2022 Jan. YYYYMMDD(UT) mag observer 20221231.6265 <152c (Yutaka Maeda) 20230102.5990 <153c (Yutaka Maeda) 20230103.5885 <154c (Yutaka Maeda) 20230104.5834 <140c (Yutaka Maeda) 20230106.508 138 (Rod Stubbings)

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[vsnet-alert 27284] Standstill in CR Boo
by Taichi Kato 06 Jan '23

06 Jan '23

Standstill in CR Boo Using ATLAS forced photometry (Tonry et al. 2018; Shingles et al. 2021) and observations reported to VSNET, I found that CR Boo was almost constant between 2022 May and early July. A faint state without a dwarf nova outburst (around 17 mag) followed. The former appears to be a true standstill without low-amplitude oscillations. The latter may have reflected a lower mass-transfer rate, but the duration was too short to be recognized as a VY Scl-type fading episode. … [View More]

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[vsnet-alert 27283] Very low state of AG Aps
by Taichi Kato 06 Jan '23

06 Jan '23

Very low state of AG Aps Accoring to ATLAS forced photometry (Tonry et al. 2018; Shingles et al. 2021), this object was near the limit of detection (near 20.0 mag) in 2022. Outbursts were also present, but very faint (17 mag).

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vsnet-alert January 2023