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

[vsnet-alert 27452] CCD observations of Nova Gaia22alz between JD = 2 459 999 and JD = 2 460 000
by Filipp Romanov 24 Feb '23

24 Feb '23

Observer: Filipp Romanov (Russia). Remotely using T17 (iTelescope.Net): 0.43-m f/6.8 reflector of Siding Spring Observatory (Australia). Color image: https://twitter.com/romanov_filipp/status/1629139986644709378 Gaia22alz 20230224.49668 12.837V 0.008 Gaia22alz 20230224.49764 13.651B 0.041 Gaia22alz 20230224.49868 11.943R 0.004 Gaia22alz 20230224.49968 11.500I 0.005 Gaia22alz 20230224.50077 12.827V 0.005 Gaia22alz 20230224.50169 13.619B 0.009 Gaia22alz 20230224.50274 11.937R 0.004 Gaia22alz 20230224.50374 11.488I 0.003 JD for observations: 2459999.996683 2459999.997636 2459999.998683 2459999.999679 2460000.000770 2460000.001692 2460000.002736 2460000.003741

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[vsnet-alert 27451] ASASSN-14ak most likely superoutburst
by Taichi Kato 24 Feb '23

24 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-alert 27450] ASASSN-14ak likely superoutburst
by Taichi Kato 24 Feb '23

24 Feb '23

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

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[vsnet-alert 27449] DDE 139 outburst
by Taichi Kato 24 Feb '23

24 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-alert 27448] ASASSN-23be: possible WZ Sge-type dwarf nova
by Naoto Kojiguchi 24 Feb '23

24 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-alert 27447] 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-alert 27446] ASASSN-18of possible outburst
by Taichi Kato 23 Feb '23

23 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-alert 27445] V476 Cyg outburst (Nova Cyg 1920)
by Taichi Kato 23 Feb '23

23 Feb '23

V476 Cyg outburst (Nova Cyg 1920) Gaia detected an outburst. See https://ui.adsabs.harvard.edu/abs/2022arXiv220306320K/abstract http://vsolj.cetus-net.org/vsoljno95.pdf The current outburst is bright and may show superhumps. Gaia23ava AT2023clo 2023-02-20 16:33:55 299.60206 53.61855 16.49 17.78 0.35 CV 2023-02-22 16:29:11 Outburst in known CV V0476 Cyg http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia23ava/

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[vsnet-alert 27444] ASASSN-23ba: new WZ Sge-type dwarf nova with prominent early superhumps
by Taichi Kato 23 Feb '23

23 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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[vsnet-alert 27443] TCP J20002413+1959394: possible WZ Sge-type dwarf nova
by Naoto Kojiguchi 22 Feb '23

22 Feb '23

TCP J20002413+1959394: possible WZ Sge-type dwarf nova Large amplitude outburst of 7 mag. Possible WZ Sge-type dwarf nova. TCP J20002413+1959394 2023 02 20.8278* 20 00 24.13 +19 59 39.4 12.9 U Sge 9 0 http://www.cbat.eps.harvard.edu/unconf/followups/J20002413+1959394.html 2023 02 20.82785 Discovered by Hideo Nishimura, Kakegawa, Shizuoka, Japan on three frames (30-s exp. limiting mag 15) taken by Canon EOS 6D digital camera + 200-mm F/3.2 lens. On 2023 Feb. 19.81791 UT, mag=12.8 (limiting mag 15), 21.82700 UT, mag=13. Nothing is visible at this location on the frames taken on 2023 Feb. 17.83795 UT (limiting mag 15) by same instrument. --- Seiichiro Naito and Isao Endoh (NAOJ) IDs: 200024.105 +195939.939 Gaia_DR2_1823298696167827200 Plx=2.3425(0.9314) dismod=8.2 pmRA=-2.23(1.102) pmDE=-0.2(1.188) G=20.5707(0.0095) BP-RP=0.3392 E(g-r)=0.032 E(B-V)=0.028 Ag=0.113 Ar=0.084 Ai=0.063 200024.106 +195939.925 Gaia_EDR3_1823298696167827200 Plx=2.2632(0.7637) dismod=8.2 PM=1.398 pmRA=-1.07(0.729) pmDE=0.9(0.727) G=20.50371(0.008507) BP-RP=0.592648 E(g-r)=0.038 E(B-V)=0.034 Ag=0.134 Ar=0.100 Ai=0.075 200024.106 +195939.951 PS1_DR1_131993001004563865 g=20.9059(0.0725) r=20.6909(0.0366) i=20.6181(0.0451) z=20.1438(0.0897) y=19.9086(0.1157) 200024.103 +195940.056 PS1_DR2_131993001004563865 g=20.8611(0.017786) r=20.6897(0.016649) i=20.5832(0.022164) z=20.1729(0.033345) y=19.8057(0.052282) 200024.103 +195940.056 PS1_DR2_131993001004563865 g=20.8637(0.017634) r=20.6718(0.016989) i=20.564(0.022398) z=20.1733(0.034204) y=19.7821(0.051221) 200024.103 +195940.056 PS1_DR2_131993001004563865 g=20.872(0.017211) r=20.6751(0.016226) i=20.5458(0.0215) z=20.2063(0.034408) y=19.811(0.052392) ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/7badee06-5665-437e-9451-b5db4… ZTF alerts: https://alerce.online/object/ZTF23aacteoa MPChecker: NO DATA TCPJ20002413+1959394 20230217.83795 <150C (Hideo Nishimura) TCPJ20002413+1959394 20230219.555 14.037zr ZAD TCPJ20002413+1959394 20230219.555 14.038zr ZAL TCPJ20002413+1959394 20230219.81791 12.8C (Hideo Nishimura) TCPJ20002413+1959394 20230220.8278 12.9C (Hideo Nishimura) TCPJ20002413+1959394 20230221.553 13.905zr ZAL TCPJ20002413+1959394 20230221.553 14.211zr ZAD TCPJ20002413+1959394 20230221.555 13.918zr ZAL TCPJ20002413+1959394 20230221.555 14.290zr ZAD TCPJ20002413+1959394 20230221.558 13.864zr ZAL TCPJ20002413+1959394 20230221.558 14.237zr ZAD TCPJ20002413+1959394 20230221.560 13.860zr ZAL TCPJ20002413+1959394 20230221.560 13.995zr ZAD TCPJ20002413+1959394 20230221.82700 13.0C (Hideo Nishimura)

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vsnet-alert February 2023