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

[vsnet-alert 28057] V854 Cen Apparent Decline
by Peter Williams 11 Apr '25

11 Apr '25

The bright southern RCB star V854 Cen appears to have commenced a decline as per the following visual observations: CENV854 20250312.780 74 WPX 10x50mm CENV854 20250402.445 80 WPX 10x50mm CENV854 20250411.465 93 WPX 20x80mm Full Moon Tks and regards Peter Williams Heathcote NSW

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[vsnet-alert 28056] X Ser in outburst
by Robert J. Modic 09 Apr '25

09 Apr '25

CCD Observations Object YYYYMMDD(UT) Mag Obs Chart Remarks SERX 20250408.305 15.72B MRV AAVSO MPO61; Err 0.03; Outburst SERX 20250408.313 15.52V MRV AAVSO MPO61; Err 0.02; Outburst Instruments: RCOS 24" w/FLI PL1603, AAVSONet (MPO61) Observer: Robert J. Modic (MRV)

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[vsnet-alert 28054] TCP J06455595+1210577: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 02 Apr '25

02 Apr '25

Dear colleagues, I have just completed the analysis of my unfiltered CCD observations of TCP J06455595+1210577, obtained on Apr 01/02, 2025 at CBA Belgium Observatory. The data was collected using a 0.40-m f/10.0 telescope and QHY-268M CMOS camera under clear skies. This object was recently discovered by XOSS and announced as a possible CV candidate (see http://www.cbat.eps.harvard.edu/unconf/followups/J06455595+1210577.html) The light curve clearly reveals the presence of regular superhumps with an amplitude of 0.29 mag, establishing TCP J06455595+1210577 as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.1) yields a combined superhump period of 0.0731 +/- 0.0014d. The object was measured at mag CV = 16.2 on Apr 01st. Image calibration and photometry were performed using Phoranso, allowing me to simultaneously measure 4 other variables within the field of view of TCP J06455595+1210577. Further observations are encouraged to refine the superhump period. I will submit my observations to AAVSO, CBA and VSNET for further analysis. 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 http://www.phoranso.com <http://www.phoranso.com/>

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[vsnet-alert 28053] outburst of LINEAR 23795703 - a CV of uncertain type in UMa
by Kirill Sokolovsky 25 Mar '25

25 Mar '25

The object LINEAR 23795703 = Gaia DR3 861540207303947776 = P_2.74a is listed as EW with the range 16.41 - 16.94 CV in the VSX https://www.aavso.org/vsx/index.php?view=detail.top&oid=322585 However, El-Badry et al. (2021) https://ui.adsabs.harvard.edu/abs/2021MNRAS.508.4106E/abstract identified it as an eclipsing cataclysmic variable (their object P_2.74a) that showed an outburst in 2015 according to ASAS-SN. El-Badry et al also present a spectrum and radial velocity curve. LINEAR 23795703 was found in outburst again on 2025-03-25.8886 UTC having CV=14.0 +/-0.1 in NMW survey images (135mm f/2.0 telephoto lens + unfiltered ST-8300M CCD). Best wishes, Kirill Sokolovsky for the NMW team

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[vsnet-alert 28052] EX Hya in outburst
by Rod Stubbings 13 Mar '25

13 Mar '25

EX Hya in outburst (NLDQ(UG)+E) HYAEX 250310.486 130 HYAEX 250313.469 106 HYAEX 250313.569 106 -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Honorary Associate member Astronomical Society of Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

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[vsnet-alert 28050] TCP J14034008+7947313: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 08 Mar '25

08 Mar '25

Dear colleagues, I have just finished analysing my unfiltered CCD observations of TCP J14034008+7947313, obtained over the past 7 nights between 2025, Feb 28 and Mar 06 at CBA Belgium Observatory using a 0.40-m f/10.0 telescope and QHY-268M CMOS camera under clear skies. No superhumps were visible in the light curves of this object till 2025, Mar 6/7. The light curve of 2025, Mar 6/7 clearly shows the presence of regular superhumps with an amplitude of 0.18 mag, establishing TCP J14034008+7947313 as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0) yields a combined superhump period of 0.0586 +/- 0.0003d. The object was at mag CV = 15.3 on Mar 06th. Image calibration and photometry were done using Phoranso, which allows to simultaneously measure other variables present in the FOV of a variable star. I will send my observations to AAVSO, CBA and VSNET for further analysis. 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 http://www.phoranso.com <http://www.phoranso.com/>

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[vsnet-alert 28049] TCP J07222683+6220548: AM CVn star showing a superoutburst
by Yusuke Tampo 28 Feb '25

28 Feb '25

TCP J07222683+6220548: AM CVn star showing a superoutburst The time-resolved observations of TCP J07222683+6220548 aka ZTF25aacfjde have been repoted by Itoh-san, Sano-san, Josch Hambsch and Tamás Tordai. This object showed a 4-mag dip in the middle of the outburst, and time-resolved observations by Itoh-san after the recovery from this dip detected single-peaked variations with a period of 0.03256(2) d, likely an ordinary superhump. Thus TCP J07222683+6220548 is a new AM CVn star showing a superoutburst. Best regards, Yusuke -- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow 反保雄介 Yusuke TAMPO MAIL: tampo(a)kusastro.kyoto-u.ac.jp MAIL: yusuke(a)saao.ac.za ----------------------------------------------

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[vsnet-alert 28048] V748 Hya outburst
by Rod Stubbings 23 Feb '25

23 Feb '25

The UGWZ star V748 Hya in bright outburst. HYAV748 250223.517 120 Stu.RASNZ -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Honorary Associate member Astronomical Society of Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

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[vsnet-alert 28047] ASASSN-25ao
by Berto Monard 05 Feb '25

05 Feb '25

Hello, ASASSN-25ao, an outbursting blue object was observed at CBA-KKO on 3 and 4 Feb 2026. The object faded from an average of 15.85 to 16.16 CR (unfiltered magnitudes) over that period. The light curves showed a modulation hinting at a main period around 0.12d and a strong secondary period of 0.030d +/- 0.0005d, derived from GLS and PDM methods in Peranso. Further observations are planned for Friday 7 Feb, when skies will be clear again. Berto Monard / CBA KKO Calitzdorp, South Africa

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[vsnet-alert 28046] V4141Sgr outburst
by Tadashi Kojima 03 Feb '25

03 Feb '25

object YYYYMMDD(UT) mag V4141Sgr 20250203.8359 13.7c Observer: Tadashi Kojima (Tsumagoi,Gunma, Japan) Instruments:fl=300mm lens +Canon EOS6D digital camera

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