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

[vsnet-alert 28013] TCP J00003597+1757408: possible stage A superhump
by Kojiguchi 16 Jul '24

16 Jul '24

TCP J00003597+1757408: possible stage A superhump Stephen M. Brincat, Josch Hambsch, Vihorlat Observatory team and Kyoto U. team have reported further time-resolved observations. Also Masao Funada have reported further snapshots. According to the observations by Stephen M. Brincat and Josch Hambsch, this object has clearly showed ordinary superhump with about 0.2 mag since July 14. The superhump period is 0.0587(1) d. Possible stage A superhump. Further observations are encouraged.

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[vsnet-alert 28012] Fw: [vsnet-adm 241288] Reporting an outburst on Delta Scorpi
by Daisaku NOGAMI 15 Jul '24

15 Jul '24

Dear colleagues, I'll forward the outburst report of delta Sco by Alireza Vafa. Best regards, Daisaku Nogami --- Daisaku NOGAMI <nogami(a)kusastro.kyoto-u.ac.jp> Begin forwarded message: Date: Mon, 15 Jul 2024 21:06:31 +0330 From: Alireza Vafa <alireza.vafa(a)gmail.com> To: vsnet-adm(a)ooruri.kusastro.kyoto-u.ac.jp Subject: [vsnet-adm 241288] Reporting an outburst on Delta Scorpi Hi I would like to report a remarkable brightening on Delta Scorpii, Dschubba, as seen from my side. Date: 15th July, 2024 Location: Tehran All the bests, -- =============== *Alireza Vafa* PhD Candidate in Space Engineering M.E. Space Engineering / MBA in Innovation Management B.E. Aerospace Engineering *Astronomy and Space* *Science researcher/ Instructor* *Mobile:* +98 91 22 14 74 83 alirezavafa(a)alum.sharif.edu *www.alirezavafa.com <http://www.alirezavafa.com/>* =============== *Before printing,* *please** think about ENVIRONMENTAL responsibility* [image: green-earth-tree-green-earth]

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[vsnet-alert 28011] TCP J00003597+1757408: early superhumps continues
by Kojiguchi 12 Jul '24

12 Jul '24

TCP J00003597+1757408: early superhumps continues Stephen M. Brincat, Vihorlat Observatory team and Tamás Tordai have reported further time-resolved observations. Also Masao Funada and Mitsutaka Hiraga have reported further snapshots. The early superhump has continued. The period and amplitude is 0.056644(5) d and about 0.04 mag. Further observations are encouraged.

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[vsnet-alert 28010] TCP J00003597+1757408: Updated period of early superhumps
by Kojiguchi 08 Jul '24

08 Jul '24

TCP J00003597+1757408: updated period of early superhumps Stephen M. Brincat, Itoh-san, Josch Hambsch, and Kyoto U. team have reported time-resolved photometry. Also Funada-san and Yoshimoto-san have reported snapshots. The early superhump period has been updated to 0.05679(2) d.

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[vsnet-alert 28009] TCP J00003597+1757408: new WZ Sge-type dwarf nova
by Keisuke Isogai 06 Jul '24

06 Jul '24

TCP J00003597+1757408: new WZ Sge-type dwarf nova We posted our spectroscopic and photometric follow-up result of TCP J00003597+1757408 to ATel. Josch Hambsch and the Kyoto U. team took the photometry data. https://www.astronomerstelegram.org/?read=16694 We conclude that this object is a new WZ Sge-type dwarf nova. Because it shows clear early superhumps and is bright (~12mag) now, it must be interesting.

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[vsnet-alert 28007] TCP J00003597+1757408: bright outburst with 8 magnitude amplitude
by Yusuke Tampo 06 Jul '24

06 Jul '24

TCP J00003597+1757408: bright outburst with 8 magnitude amplitude TCP J00003597+1757408 2024 07 05.7062* 00 00 35.97 +17 57 40.8 11.9 U Peg 9 9 http://www.cbat.eps.harvard.edu/unconf/followups/J00003597+1757408.html Blue color of the likely counterpart in Pan-STARRS1 suggests a WZ Sge star. This outburst is also detected in ASAS-SN Sky Patrol. https://asas-sn.osu.edu/sky-patrol/coordinate/efb9891f-d7d3-4991-bdb0-91b5f… TCPJ00003597+1757408 20240705.412 12.349g ASN TCPJ00003597+1757408 20240705.414 12.341g ASN TCPJ00003597+1757408 20240705.415 12.363g ASN TCPJ00003597+1757408 20240705.706 11.9C (TOCP) -- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow Yusuke TAMPO MAIL: tampo(a)kusastro.kyoto-u.ac.jp MAIL: yusuke(a)saao.ac.za ----------------------------------------------

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[vsnet-alert 27998] Call for monitoring of SS Cyg
by Daisaku NOGAMI 10 Jun '24

10 Jun '24

Dear colleagues, We would like to call for dense monitoring of SS Cyg for coming tens of days. X-ray observations by the new X-ray telescope XRISM (PI: Manabu Ishida) will be scheduled based on optical detection of the next outburst. The SS Cyg observation window with XRISM will open on April 14. We would be thankful, if the VSNET observers would monitor SS Cyg more than usual and timely report outburst detection, say brighter than V=11.0. Best regards, Daisaku Nogami --- Daisaku NOGAMI <nogami(a)kusastro.kyoto-u.ac.jp>

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[vsnet-alert 28002] ASASSN-19rx: started very slow long outburst?
by Kojiguchi 30 Apr '24

30 Apr '24

ASASSN-19rx: started very slow long outburst? According to ZTF alerts, this object is slightly brighter than its quiescence in now. This object might started an outburst. Eclipse. Porb = 2.47d. Outburst cycle: about 5 years Outburst duration: about 1 year ephemeris of primary/secondary eclipses calculated (based on ephemeris in Junpei Ito's master thesis): 2024-04-30T19:55:22 (primary) 2024-05-02T01:35:50 (secondary) 2024-05-03T07:16:19 (primary) 2024-05-04T12:56:47 (secondary) 2024-05-05T18:37:16 (primary) 2024-05-07T00:17:44 (secondary) 2024-05-08T05:58:12 (primary) 2024-05-09T11:38:41 (secondary) 2024-05-10T17:19:09 (primary) 2024-05-11T22:59:38 (secondary) 2024-05-13T04:40:06 (primary) 2024-05-14T10:20:34 (secondary) 2024-05-15T16:01:03 (primary) 2024-05-16T21:41:31 (secondary) 2024-05-18T03:22:00 (primary) 2024-05-19T09:02:28 (secondary) 2024-05-20T14:42:57 (primary) 2024-05-21T20:23:25 (secondary) See also: vsnet-alert 23931, 23451, 23460, 23466

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[vsnet-alert 28000] Follow-up CCD observation of SN 2024ggi in NGC 3621
by Filipp Romanov 15 Apr '24

15 Apr '24

I observed SN 2024ggi in NGC 3621 remotely at iTelescope.Net T32 (0.43-m f/6.8 reflector + CCD) at Siding Spring Observatory, Australia, on 2024-04-11. 180-sec. image with V filter was obtained with midtime 14:33:30 UT and 180-sec. image with Ic filter was obtained with midtime 14:37:23 UT. I measured the position (J2000.0) of the supernova: 11:18:22.091 -32:50:15.34. I measured the magnitude of it: V = 16.220 +/- 0.024 from comparison to magnitudes of nearby stars from APASS DR9 catalogue (Henden et al., 2016). Color image available here: https://www.flickr.com/photos/filipp-romanov/53649145565 SN 2024ggi 20240411.60660 16.220V RFD 0.024 F. D. Romanov (AAVSO).

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[vsnet-alert 27999] ASASSN-24cg (aka Gaia DR3 4378710224740797312): new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 04 Apr '24

04 Apr '24

Dear colleagues, I have just finished analysing my unfiltered CCD observations of ASASSN-24cg (aka Gaia DR3 4378710224740797312 and TCP J16454549-0257144) obtained on 2024, Apr 03/04 at CBA Extremadura Observatory using a 0.40-m f/5.1 telescope and SX-46 CCD camera, under clear skies. The resulting light curve clearly shows the presence of superhumps with an amplitude of 0.34 mag, establishing ASASSN-24cg as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Lomb-Scargle, Lomb-Scargle GLS and PDM methods (Peranso 3.0) yields a combined superhump period of 0.0613 +/- 0.0007d. The object was at mag CV = 13.5 on Apr 4th. Image calibration and photometry were done using a beta version of Phoranso. I will send my observations to AAVSO, CBA and VSNET for further analysis. Best regards Tonny With kind regards, Tonny --- Tonny Vanmunster CBA Belgium Observatory CBA Extremadura Observatory http://www.cbabelgium.co <http://www.cbabelgium.com/> m PERANSO : The Light Curve and Period Analysis Software http://www.peranso.co <http://www.peranso.com/> m PHORANSO: Photometric Reduction and Analysis Software *** NEW - COMING SOON *** http://www.phoranso.com <http://www.phoranso.com/>

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