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

[vsnet-newvar 9816] MASTER OT J055845.55+391533.4 superhumps?
by Taichi Kato 24 Feb '23

24 Feb '23

MASTER OT J055845.55+391533.4 superhumps? Kiyota-san reported observations. The data appear consistent with a longer superhump period of a hydrogen-rich system. The data, however, were not enough and more observations are needed (the outburst behavior is unusual for ar ordinary SU UMa star).

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[vsnet-newvar 9815] MV Leo: unusual start of standstill
by Taichi Kato 23 Feb '23

23 Feb '23

MV Leo: unusual start of standstill Using ATLAS and ZTF data, I found that this object entered a standstill almost directly from a low state in 2020 Mar.-Apr. Such behavior is unexpected. This standstill ended with an outburst like an IW And star.

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[vsnet-newvar 9814] 6dFg0002074-374917: deeply eclpsing likely SU UMa star
by Taichi Kato 23 Feb '23

23 Feb '23

6dFg0002074-374917: deeply eclpsing likely SU UMa star Using ATLAS forced photometry (Tonry et al. 2018; Shingles et al. 2021). Porb=0.0711838(1) d. 1.5-mag deep eclipses and orbital humps in quiescence. Likely superoutburst in 2020.

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[vsnet-newvar 9813] ASASSN-14ak most likely superoutburst
by Taichi Kato 23 Feb '23

23 Feb '23

ASASSN-14ak most likely superoutburst (Porb=0.08869) YYYYMMDD(UT) mag observer 20230211.0933 18.240o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230212.2114 17.939o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230212.2142 17.992o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230212.2195 18.049o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230212.2255 17.917o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230212.2295 17.910o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230212.2304 17.840o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230212.2630 17.972o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230212.2686 17.907o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230214.9525 18.172o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230214.9557 18.175o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230214.9634 18.088o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230214.9777 18.214o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1413 18.197c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1641 18.070c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1659 18.136c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1683 18.237c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1697 18.225c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1701 18.240c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1733 18.023c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1872 18.179c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230220.1531 18.373c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230220.1567 18.391c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230220.1599 18.265c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230220.1662 18.319c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230222.9545 13.374o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230222.9577 13.372o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230222.9629 13.392o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230222.9729 13.376o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230223.487 133 (Rod Stubbings)

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[vsnet-newvar 9812] ASASSN-14ak likely superoutburst
by Taichi Kato 23 Feb '23

23 Feb '23

ASASSN-14ak likely superoutburst YYYYMMDD(UT) mag observer 20230223.487 133 (Rod Stubbings)

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[vsnet-newvar 9811] DDE 139 outburst
by Taichi Kato 23 Feb '23

23 Feb '23

DDE 139 outburst Possible superoutburst (suspected type from past ZTF and ATLAS data). Gaia23avk AT2023cmu 2023-02-22 02:07:36 203.00327 -4.90294 16.03 18.83 1.28 CV 2023-02-23 12:54:57 5 mag outburst in known CV http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia23avk/ YYYYMMDD(UT) mag observer 20230215.8431 <173C (Masayuki Moriyama) 20230219.8683 <169C (Masayuki Moriyama) 20230222.0225 16.111o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230222.0243 16.112o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230222.0394 16.106o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230222.0448 16.126o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230223.3467 15.820c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230223.3810 16.096c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230223.3842 16.075c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505))

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[vsnet-newvar 9810] ASASSN-23be: possible WZ Sge-type dwarf nova
by Naoto Kojiguchi 23 Feb '23

23 Feb '23

ASASSN-23be: possible WZ Sge-type dwarf nova Large amplitude outburst of 7 mag. Possible WZ Sge-type dwarf nova. ASASSN-23be --- ------- 10:2:29.28 -25:20:34.3 2023-02-23.15 15.76 SDSS DSS VIZIER ------- CV candidate, no Vizier match, g>18.4 on 2023-02-18.10, g=14.9 on 2023-02-19.03, g=15.6 on 2023-02-21.27, g=16.0 on 2023-02-23.15 IDs: 100229.083 -252034.26 PS1_DR2_77581506211468950 g=22.014(0.167) r=--(--) i=--(--) z=--(--) y=--(--) ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/48554653-eae0-440b-8451-d14a3… ASASSN-23be 20230218.096 <16.969g ASN ASASSN-23be 20230218.096 <17.109g ASN ASASSN-23be 20230218.097 <17.062g ASN ASASSN-23be 20230218.097 <17.078g ASN ASASSN-23be 20230218.098 <16.926g ASN ASASSN-23be 20230218.098 <17.112g ASN ASASSN-23be 20230218.122 <16.945g ASN ASASSN-23be 20230218.122 <17.123g ASN ASASSN-23be 20230218.124 <17.002g ASN ASASSN-23be 20230218.124 <17.215g ASN ASASSN-23be 20230218.125 <17.032g ASN ASASSN-23be 20230218.125 <17.160g ASN ASASSN-23be 20230219.032 14.935g ASN ASASSN-23be 20230219.032 15.048g ASN ASASSN-23be 20230219.034 14.920g ASN ASASSN-23be 20230219.034 15.082g ASN ASASSN-23be 20230219.035 14.911g ASN ASASSN-23be 20230219.035 15.020g ASN ASASSN-23be 20230219.085 14.832g ASN ASASSN-23be 20230219.085 14.950g ASN ASASSN-23be 20230219.086 14.877g ASN ASASSN-23be 20230219.086 14.913g ASN ASASSN-23be 20230219.087 14.908g ASN ASASSN-23be 20230219.087 14.946g ASN ASASSN-23be 20230219.804 15.104g ASN ASASSN-23be 20230219.804 15.169g ASN ASASSN-23be 20230220.159 15.069cy ATF ASASSN-23be 20230220.161 15.132cy ATF ASASSN-23be 20230220.164 15.148cy ATF ASASSN-23be 20230220.192 15.001cy ATF ASASSN-23be 20230220.255 15.344g ASN ASASSN-23be 20230220.256 15.418g ASN ASASSN-23be 20230220.257 15.372g ASN ASASSN-23be 20230220.376 15.338g ASN ASASSN-23be 20230220.377 15.302g ASN ASASSN-23be 20230221.270 15.708g ASN ASASSN-23be 20230221.271 <15.788g ASN ASASSN-23be 20230221.319 <15.156g ASN ASASSN-23be 20230221.320 15.608g ASN ASASSN-23be 20230221.321 <14.612g ASN ASASSN-23be 20230221.912 15.590g ASN ASASSN-23be 20230221.912 15.617g ASN ASASSN-23be 20230221.913 15.575g ASN ASASSN-23be 20230221.913 15.601g ASN ASASSN-23be 20230221.914 15.547g ASN ASASSN-23be 20230221.914 15.642g ASN ASASSN-23be 20230222.364 15.871g ASN ASASSN-23be 20230222.364 15.963g ASN ASASSN-23be 20230222.365 15.945g ASN ASASSN-23be 20230222.365 15.958g ASN ASASSN-23be 20230222.366 15.865g ASN ASASSN-23be 20230222.366 15.997g ASN ASASSN-23be 20230222.891 15.814g ASN ASASSN-23be 20230222.891 15.959g ASN ASASSN-23be 20230222.892 15.855g ASN ASASSN-23be 20230222.892 15.964g ASN ASASSN-23be 20230222.893 15.793g ASN ASASSN-23be 20230222.893 15.940g ASN ASASSN-23be 20230222.956 15.942o ATF ASASSN-23be 20230222.959 15.914o ATF ASASSN-23be 20230222.964 15.947o ATF ASASSN-23be 20230223.121 15.887g ASN ASASSN-23be 20230223.122 15.827g ASN ASASSN-23be 20230223.122 15.831g ASN ASASSN-23be 20230223.124 15.967g ASN ASASSN-23be 20230223.151 15.960g ASN ASASSN-23be 20230223.151 16.120g ASN ASASSN-23be 20230223.152 15.980g ASN ASASSN-23be 20230223.152 16.019g ASN ASASSN-23be 20230223.153 15.940g ASN ASASSN-23be 20230223.153 16.053g ASN ASASSN-23be 20230223.792 16.105g ASN ASASSN-23be 20230223.792 16.274g ASN ASASSN-23be 20230223.794 16.167g ASN ASASSN-23be 20230223.794 16.388g ASN ASASSN-23be 20230223.795 16.010g ASN ASASSN-23be 20230223.795 16.120g ASN

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[vsnet-newvar 9809] TCP J03400682+4809123 = AT 2023cmv
by Naoto Kojiguchi 23 Feb '23

23 Feb '23

TCP J03400682+4809123 = AT 2023cmv Large amplitude outburst of more than 8.2 mag. TCP J03400682+4809123 2023 02 23.4409* 03 40 06.82 +48 09 12.3 14.0 U Per 9 0 http://www.cbat.eps.harvard.edu/unconf/followups/J03400682+4809123.html 2023 02 23.4409 Discovered by Tadashi Kojima, Tsumagoi,Gunma-ken, Japan, on six frames(5_s exp) under limiting mag.= 14.2 taken by Canon EOS 6D digital camera + 300mm f/2.8 lens 2023 02 23.4409 Correction limiting mag=15.0, T.Kojima TNS: https://www.wis-tns.org/object/2023cmv IDs: (3.5 arcsec) 034006.514 +480910.492 PS1_DR1_165780550272254224 g=22.2278(0.0642) r=21.423(0.2576) i=--(--) z=--(--) y=--(--) 034006.525 +480910.595 PS1_DR2_165780550272254224 g=22.3733(0.094649) r=22.0921(0.090924) i=22.0943(0.103277) z=21.7519(0.156152) y=22.3277(0.626186) 034006.527 +480910.595 SDSSJ034006.52+480910.5 u=22.507(0.375) g=22.071(0.076) r=21.599(0.074) i=21.852(0.134) z=21.817(0.553) MPChecker NO DATA ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/73d960f0-d993-49dc-8946-1640f… TCPJ03400682+4809123 20230205.181 <15.838g ASN TCPJ03400682+4809123 20230205.182 <15.704g ASN TCPJ03400682+4809123 20230205.183 <15.750g ASN TCPJ03400682+4809123 20230223.4409 14.0C (Tadashi Kojima)

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[vsnet-newvar 9808] ASASSN-18of possible outburst
by Taichi Kato 22 Feb '23

22 Feb '23

ASASSN-18of possible outburst Likely SU UMa star from ATLAS data (long outburst + rebrightening in 2018). YYYYMMDD(UT) mag observer 20230130.7011 <155c (Yutaka Maeda) 20230204.6965 <159c (Yutaka Maeda) 20230210.7105 <150c (Yutaka Maeda) 20230214.6946 <148c (Yutaka Maeda) 20230215.6963 <163c (Yutaka Maeda) 20230221.6485 157:c (Yutaka Maeda)

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[vsnet-newvar 9807] ASASSN-23ba: new WZ Sge-type dwarf nova with prominent early superhumps
by Taichi Kato 22 Feb '23

22 Feb '23

ASASSN-23ba: new WZ Sge-type dwarf nova with prominent early superhumps Berto Monard has reported observations. The object showed early superhumps with a period of 0.0562(3) d (single night baseline). The full amplitude was 0.30 mag. The object may be eclipsing and further observations are encouraged.

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