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

[vsnet-alert 28065] TCP J02472889+6758170 = Gaia DR3 517539710877791488
by Yusuke Tampo 26 May '25

26 May '25

TCP J02472889+6758170 = Gaia DR3 517539710877791488 The NMW team discovered this transient at 13.0 mag (unfiltered), which is associated with the known variable star Gaia DR3 517539710877791488 with ~18.0 mag. They suggest that this could be an AM CVn star in outburst. Its blue color in the Pan-STARRS1 image also supports this suggestion, and TCP J02472889+6758170 is at least a CV in new outburst. http://www.cbat.eps.harvard.edu/unconf/followups/J02472889+6758170.html https://www.aavso.org/… [View More]

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[vsnet-alert 28064] ASASSN-25bu: new SU UMa-type dwarf nova
by Yusuke Tampo 23 May '25

23 May '25

ASASSN-25bu: new SU UMa-type dwarf nova ASASSN-25b was discovered by ASAS-SN on 2025-05-12.06. The outburst amplitude is ~8.3 mag according to the VSX. This object is currently ~17.5 mag. https://www.aavso.org/vsx/index.php?view=detail.top&oid=10848624 Josch Hambsch and the SAAO team have reported the time-seeries observations of ASASSN-25bu. Lesedi/Mookodi observations on 22 May showed probable superhumps with a period of ~0.0574 d and an amplitude of ~0.15 mag. Thus ASASSN-25bu is a new … [View More]

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[vsnet-alert 28062] ZTF18acynctq = TCP J20402089+4915562 = ASASSN-25bt: new SU UMa star candidate
by Yusuke Tampo 20 May '25

20 May '25

ZTF18acynctq = TCP J20402089+4915562 = ASASSN-25bt: new SU UMa star candidate XOSS team via TOCP/TNS and ASAS-SN reported the 2025 outburst of this system, which is already known as ZTF18acynctq in its 2018 outburst. https://alerce.online/object/ZTF18acynctq http://www.cbat.eps.harvard.edu/unconf/followups/J20402089+4915562.html https://www.aavso.org/vsx/index.php?view=detail.top&oid=10848612 Its 2018 outburst lasted for ~15 days and showed a possible rebrightening in the ATLAS data. … [View More]

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[vsnet-alert 28061] V598 Sco: an eclipsing dwarf nova
by Rod Stubbings 19 May '25

19 May '25

V598 Sco is an active dwarf nova and listed in VSX as a UG star, range 14.9 - 17.0: V. [vsnet-chat 9283] lists V598 Sco as a Z Cam star. V598 Sco has been on my list for a number of years. On May 2 during an outburst I noticed a fading, then returned to normal brightness. A second fading occurred approx 3h 46 min later, which I observed back to normal. With a new outburst on May 18, I made 1-minute observations for 3h 29 minutes and caught another eclipse. Kept observations ongoing … [View More]throughout the night and caught a second eclipse. The eclipse period was 3h 45 minutes. The first eclipse duration was 12 minutes and the second eclipse was 10 minutes. First eclipse: V598 SCO 2460814.0236 15.20 V598 SCO 2460814.0243 15.10 V598 SCO 2460814.0250 15.10 V598 SCO 2460814.0257 15.20 V598 SCO 2460814.0264 15.20 V598 SCO 2460814.0271 15.20 V598 SCO 2460814.0278 15.20 V598 SCO 2460814.0285 15.20 V598 SCO 2460814.0292 15.20 V598 SCO 2460814.0299 15.30 V598 SCO 2460814.0306 15.30 V598 SCO 2460814.0313 -15.30 V598 SCO 2460814.0319 -15.30 V598 SCO 2460814.0326 -15.40 V598 SCO 2460814.0333 -15.40 V598 SCO 2460814.0340 -15.40 V598 SCO 2460814.0347 -15.40 V598 SCO 2460814.0354 -15.50 V598 SCO 2460814.0361 -15.50 V598 SCO 2460814.0368 -15.50 V598 SCO 2460814.0375 -15.50 V598 SCO 2460814.0382 -15.50 V598 SCO 2460814.0389 -15.50 V598 SCO 2460814.0396 15.60 V598 SCO 2460814.0403 15.60 V598 SCO 2460814.0410 15.40 V598 SCO 2460814.0417 15.40 V598 SCO 2460814.0424 15.30 V598 SCO 2460814.0431 15.30 V598 SCO 2460814.0438 15.20 V598 SCO 2460814.0444 15.20 V598 SCO 2460814.0451 15.10 V598 SCO 2460814.0458 15.10 Second eclipse: V598 SCO 2460814.1833 14.90 V598 SCO 2460814.1840 15.00 V598 SCO 2460814.1847 15.10 V598 SCO 2460814.1854 15.10 V598 SCO 2460814.1861 15.10 V598 SCO 2460814.1868 15.20 V598 SCO 2460814.1875 15.30 V598 SCO 2460814.1882 -15.30 V598 SCO 2460814.1889 -15.30 V598 SCO 2460814.1896 -15.30 V598 SCO 2460814.1903 -15.30 V598 SCO 2460814.1910 -15.30 V598 SCO 2460814.1917 -15.40 V598 SCO 2460814.1924 -15.40 V598 SCO 2460814.1931 -15.40 V598 SCO 2460814.1938 -15.40 V598 SCO 2460814.1944 -15.40 V598 SCO 2460814.1951 15.50 V598 SCO 2460814.1958 15.50 V598 SCO 2460814.1965 15.40 V598 SCO 2460814.1972 15.40 V598 SCO 2460814.1979 15.30 V598 SCO 2460814.1986 15.30 V598 SCO 2460814.1993 15.10 V598 SCO 2460814.2000 15.00 V598 SCO 2460814.2007 15.00 V598 SCO 2460814.2014 14.90 V598 SCO 2460814.2021 14.90 V598 SCO 2460814.2028 14.90 -- 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/ [View Less]

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[vsnet-alert 28060] TCP J19065629+4019093: new SU UMa-type dwarf novae and WZ Sge-type candidate
by Yusuke Tampo 11 May '25

11 May '25

TCP J19065629+4019093: new SU UMa-type dwarf novae and WZ Sge-type candidate TCP J19065629+4019093 was discovered by Y. Nakamura on 29th April, 2025, at 13.1 mag. S. M. Brincat, J. Hambsch, Itoh-san, T. Tordai, and Sano-san have reported the time-resolved observations of this new transient. The latest time-resolved observations on 9th May by S. M. Brincat report the presence of single-peaked superhumps with ~0.056 d. Thus TCP J19065629+4019093 is a new SU UMa-type dwarf nova. Taking into … [View More]

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[vsnet-alert 28059] TCP J13560585+3727068: new WZ Sge-type dwarf nova
by Yusuke Tampo 30 Apr '25

30 Apr '25

TCP J13560585+3727068: new WZ Sge-type dwarf nova TCP J13560585+3727068 was discovered on 2025 04 26.7039 (UTC) at 14.3 mag (unfiltered). GIven the possible counterpart of Gaia G~20.8 and peak in ASAS-SN around 13.5 mag on 2025 04 24, the outburst amplitude is ~7.3 mag Itoh-san reported the time-resolved observations of TCP J13560585+3727068 on 2024 04 28 and 29. The light curve shows double-peaked modulations with the tentative period is 0.0574(1) d (aliases are possible) with ~0.04-mag … [View More]

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[vsnet-alert 28055] TCP J08374922+0134065: new WZ Sge-type dwarf nova with large early superhump amplitude
by Yusuke Tampo 14 Apr '25

14 Apr '25

TCP J08374922+0134065: new WZ Sge-type dwarf nova with large early superhump amplitude TCP J08374922+0134065 was discovered by Y. Nakamura on 3rd April at 14.7 mag. Based on the suggested counterpart (GALEX J083749.2+013407) with g=20.22(2) and the brightest ASAS-SN measurement with g~13.4 mag, the outburst amplitude is 6.8mag. http://www.cbat.eps.harvard.edu/unconf/followups/J08374922+0134065.html https://asas-sn.osu.edu/sky-patrol/coordinate/dce846f3-485d-4614-bace-a8b3e… Itoh-san has … [View More]

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[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 … [View More]

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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 … [View More]

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