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

[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))

1 0

[vsnet-alert 27448] 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

1 0

[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)

1 0

[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)

1 0

[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/

1 0

[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.

1 0

[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)

1 0

[vsnet-alert 27442] MASTER OT J055845.55+391533.4 outburst (likely AM CVn)
by Taichi Kato 22 Feb '23

22 Feb '23

MASTER OT J055845.55+391533.4 outburst (likely AM CVn) Maeda-san detected an outburst at 14.0 on Feb. 21. Supercycle 220-400 d (ZTF data).

1 0

[vsnet-alert 27441] CCD observations of TCP J17562787-1714548 = Nova Sgr 2023
by Filipp Romanov 21 Feb '23

21 Feb '23

Observer: Filipp Romanov (AAVSO, Russia). Remotely using iTelescope.Net T11 (0.50-m f/6.8 reflector + CCD + f/4.5 focal reducer) in Utah Desert Remote Observatory at Great Basin Desert, Beryl Junction, Utah, USA. TCPJ17562787-1714548 20230221.52963 10.315I RFD 0.006 TCPJ17562787-1714548 20230221.52866 10.718R RFD 0.003 TCPJ17562787-1714548 20230221.52767 12.625B RFD 0.003 TCPJ17562787-1714548 20230221.52660 11.879V RFD 0.001 TCPJ17562787-1714548 20230221.52557 10.322I RFD 0.009 TCPJ17562787-1714548 20230221.52459 10.715R RFD 0.004 TCPJ17562787-1714548 20230221.52360 12.648B RFD 0.005 TCPJ17562787-1714548 20230221.52255 11.884V RFD 0.002 Color image (3x60 sec. with V, B, Rc filters): https://www.flickr.com/photos/filipp-romanov/52702897703/ With best wishes, Filipp.

1 0

[vsnet-alert 27440] Re: Spectrum of TCP J06442271+1549388
by Taichi Kato 21 Feb '23

21 Feb '23

Re: Spectrum of TCP J06442271+1549388 > We reported optical spectrum of TCP J17562787-1714 to ATel #15911 and > classify it as a He/N-type nova: V407 Cyg erupted in symbiotic environment and a fast nova. These features are not exclusive. Could be a nova similar to V407 Cyg?

1 0