June 2022 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 26797] ASASSN-22ho: new SU UMa-type dwarf nova

by tonny.vanmunster＠gmail.com

Dear colleagues, I have just finished analysing my unfiltered CCD observations of ASASSN-22ho, obtained on 2022, June 02/03 at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope and QHY-286M CMOS camera under clear skies. Regular superhumps with an amplitude of 0.35 mag are very clearly visible in the resulting light curve, establishing ASASSN-22ho 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 (long) superhump period of 0.0902 +/- 0.0025d. The object was at mag CV = 16.5 on Jun 03rd. I will send my observations to AAVSO, CBA and VSNET for further analysis. Best regards Tonny --- Tonny Vanmunster CBA Belgium Observatory CBA Extremadura Observatory http://www.cbabelgium.com PERANSO : The Light Curve and Period Analysis Software http://www.peranso.com

6 months, 1 week

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[vsnet-alert 26448] ASASSN-13cx outburst

by 前田豊

UGSU+E ASASSN-13cx outburst. ASASSN-13cx 20211118.57382 151:c Mdy.VSOLJ MAEDA Yutaka Nagasaki Japan

10 months, 2 weeks

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[vsnet-alert 26857] New follow-up observations of TCP J15244460-6059200 = FQ Cir

by Filipp Romanov

Observer: Filipp Romanov (Russia). Remotely using T30 (iTelescope.Net): 0.50-m f/6.8 reflector of Siding Spring Observatory (Australia): CIRFQ 20220625.67985 11.28V RFD CIRFQ 20220625.68264 12.02B RFD CIRFQ 20220625.68532 10.42R RFD CIRFQ 20220625.68843 9.69I RFD Color image: https://www.flickr.com/photos/filipp-romanov/52182779263 or https://twitter.com/romanov_filipp/status/1542218300897230848

11 months, 1 week

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[vsnet-alert 26856] Re: ASASSN-18su

by Taichi Kato

Re: ASASSN-18su Superhumps were already detected during the 2018 superoutburst by Berto Monard. Superhumps appeared on 2018 Aug. 25. Due to the short visibility, the period was not determined.

11 months, 1 week

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[vsnet-alert 26854] ASASSN-18su (super?)outburst (since June 24)

by Patrick Schmeer

ASASSN-18su (UG) https://www.aavso.org/vsx/index.php?view=detail.top&oid=623474 ASASSN-18su was discovered on 2018 August 17. Unfortunately that outburst could be followed for only few days. After the seasonal gap a very long fading tail can be seen in ATLAS forced photometry data. T. Kato wrote (vsnet-alert 22429): "The Gaia proper motion is comparable to that of OV Boo ... ASASSN-18su looks likely a population II CV candidate." The current outburst was detected by Rod Stubbings at mv= 11.3 on 2022 June 28.537 UT (vsnet-outburst 28822, vsnet-alert 26852). It had already started on June 24 and is 1.5 magnitudes fainter than the 2018 outburst according to ASAS-SN Sky Patrol data: https://asas-sn.osu.edu/sky-patrol/coordinate/52d16cd1-3548-431f-a7fc-326e3… Time-resolved photometry is urgently required. Clear skies, Patrick ------- References: All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol: - Shappee et al., 2014ApJ...788...48S - Kochanek et al., 2017PASP..129j4502K Asteroid Terrestrial-impact Last Alert System (ATLAS): - Tonry et al., 2018PASP..130f4505T

11 months, 1 week

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[vsnet-alert 26853] QZ Vir (= T Leo) superoutburst (since June 21)

by Patrick Schmeer

QZ Virginis = T Leonis (UGSU) https://www.aavso.org/vsx/index.php?view=detail.top&oid=17034 Outburst first detected on 2022 June 22.981 UT at V= 10.36 by Carlos Colesanti (CCT): https://app.aavso.org/webobs/results/?star=000-BBS-294 Observed on June 28.424 UT at mv= 10.4 by Rod Stubbings (vsnet-outburst 28822). Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) light curve and data: https://asas-sn.osu.edu/sky-patrol/coordinate/c371f339-8e10-448c-98f5-e234f… The current superoutburst started on 2022 June 20 or 21. A normal outburst was observed from 2022 Jan. 31 to Feb. 3. Clear skies, Patrick

11 months, 1 week

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[vsnet-alert 26852] ASASSN-18su outburst

by Rod Stubbings

ASASSN-18su is in outburst. Last known outburst was in 2018. ASASSN-18su 220628.537 113 -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

11 months, 1 week

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[vsnet-alert 26851] TCP J15244460-6059200: strange Galactic nova (mag. 11) in Circinus

by Patrick Schmeer

TCP J15244460-6059200 (N) (submitted to VSX) RA 15h24m47.62s DE -60°59'47.3" (Gaia DR3, equinox and epoch J2000.0) Discoverer: Andrew Pearce (Nedlands, Western Australia) http://www.cbat.eps.harvard.edu/unconf/followups/J15244460-6059200.html Elias Aydi et al.: "SOAR spectroscopic follow-up of the Galactic optical transient TCP J15244460-6059200" (ATel #15473): https://www.astronomerstelegram.org/?read=15473 Quote: "The spectrum resembles that of a very fast classical nova after optical peak. The low amplitude of the transient raises questions about its nature and the possible progenitor match. TCP J15244460-6059200 could be an unusually low-amplitude, ultra-fast nova or a more exotic phenomenon. There is a slight chance that the actual progenitor system is much fainter and coincides with the bright (~14 mag) match, which would explain the unusually low- amplitude of the transient." The likely progenitor is the Gaia DR3 source 5875610751015084544 (Gmag. 13.75, BP-RP= 0.73, Teff ~22500 K, parallax 0.11 ± 0.02 mas, distance 6.5 ± 0.8 kpc). SMSS data: gPSF= 13.98, rPSF= 13.70, iPSF= 13.74 APASS data: V= 13.88, B= 14.35, g'= 14.08, r'= 13.70, i'= 13.65 So the eruption amplitude seems to be only 3 magnitudes! And the likely progenitor does not look like a typical CV in quiescence. ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) light curves and data: https://asas-sn.osu.edu/sky-patrol/coordinate/63cd3b67-9d82-41da-869e-4d122… https://asas-sn.osu.edu/sky-patrol/coordinate/a61c2edb-9cab-4d5c-b9cf-f886b… TCPJ15244460-6059200 20220619.1200 14.00g ASN TCPJ15244460-6059200 20220625.2002 10.91g ASN TCPJ15244460-6059200 20220625.2015 10.92g ASN TCPJ15244460-6059200 20220625.2027 10.97g ASN TCPJ15244460-6059200 20220625.9486 12.00g ASN TCPJ15244460-6059200 20220625.9498 11.96g ASN TCPJ15244460-6059200 20220625.9510 12.00g ASN TCPJ15244460-6059200 20220626.2656 12.28g ASN TCPJ15244460-6059200 20220626.2668 12.27g ASN TCPJ15244460-6059200 20220626.2682 12.28g ASN TCPJ15244460-6059200 20220626.9602 12.71g ASN TCPJ15244460-6059200 20220626.9615 12.65g ASN TCPJ15244460-6059200 20220626.9628 12.81g ASN Could the apparent fading trend in ASAS-3 data be real? http://www.astrouw.edu.pl/cgi-asas/asas_variable/152448-6059.8,asas3,0,9755… Further spectroscopy and multiband photometry are required. Clear skies, Patrick

11 months, 2 weeks

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[vsnet-alert 26850] TCP J22561804+4109534: new transient (mag. 14) in Lacerta

by Patrick Schmeer

TCP J22561804+4109534 (UG:) (submitted to VSX) RA 22h56m18.05s +41°09'54.3" (J2000.0, Pan-STARRS1) 2022 June 26.6897 UT, mag. 14.0 (CMOS camera, unfiltered) Discoverer: Yuji Nakamura (Kameyama, Mie, Japan) 2022 06 26.6897 UT Discovered by Yuji Nakamura, Kameyama, Mie, Japan, on two frames (30-s exp. limiting mag 16.0) taken by 10cm/F3.0 refractor and CMOS camera. Nothing is visible at this location on the frames taken on 2022 June 18.7097 UT (30-s exp. limiting mag 16.0) by same instrument. --- Isao Endoh (NAOJ) http://www.cbat.eps.harvard.edu/unconf/followups/J22561804+4109534.html Complete ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) light curve and data: https://asas-sn.osu.edu/sky-patrol/coordinate/a342649c-16c0-43e6-86f6-933b9… TCPJ22561804+4109534 20220624.4688 <17.55g ASN TCPJ22561804+4109534 20220626.3301 14.70g ASN TCPJ22561804+4109534 20220626.3314 14.76g ASN TCPJ22561804+4109534 20220626.3326 14.74g ASN TCPJ22561804+4109534 20220626.3379 14.71g ASN TCPJ22561804+4109534 20220626.3391 14.72g ASN TCPJ22561804+4109534 20220626.3404 14.69g ASN Time-resolved and multiband (V, B, ...) photometry are required (spectroscopy is also encouraged). Clear skies, Patrick

11 months, 2 weeks

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[vsnet-alert 26849] Follow-up observations of TCP J15244460-6059200

by Filipp Romanov

Observer: Filipp Romanov (Russia). Remotely using T30 (iTelescope.Net): 0.50-m f/6.8 reflector of Siding Spring Observatory (Australia): TCPJ15244460-6059200 20220625.6794 11.25V RFD 0.01 TCPJ15244460-6059200 20220625.6822 12.03B RFD 0.03 TCPJ15244460-6059200 20220625.6849 10.37R RFD 0.01 The object's position is almost the same as the source 5875610751015084544 in the Gaia DR3 catalogue. The ASAS-SN light curve: https://asas-sn.osu.edu/sky-patrol/coordinate/5adadbd1-c25e-4aab-9060-fa7ce… (indicates that the object did not change brightness significantly before 2022-06-25.200 when it had g mag = 10.9).

11 months, 2 weeks

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2023

2022

2021

vsnet-alert June 2022