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

[vsnet-alert 27998] Call for monitoring of SS Cyg
by Daisaku NOGAMI 15 Apr '24

15 Apr '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>

1 1

[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).

1 0

[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/>

1 0

[vsnet-alert 27997] TU MEN in burst
by Prof. Daniel J. Mendicini 22 Mar '24

22 Mar '24

Photometric measurements carried out by me, using the remote telescope of the Universidad de la Punta San Luis, Argentina, place the star at CV 12,118. TU MEN 2460375.561977 2024 Mar. 06.06198 CV 12.107 MDJ TU MEN 2460375.56155 2024 Mar. 06.06155 CV 12.042 MDJ TU MEN 2460375.561123 2024 Mar. 06.06112 CV 12.061 MDJ TU MEN 2460375.560696 2024 Mar. 06.06070 CV 12.083 MDJ TU MEN 2460375.559842 2024 Mar. 06.05984 CV 12.086 MDJ TU MEN 2460375.559425 2024 Mar. 06.05943 CV 12.118 MDJ TU MEN 2460369.0292 2024 Feb. 28.52920 V <13.8 SRXTU MEN 2460367.9451 2024 Feb. 27.44510 V <14.8 SRXTU MEN 2460364.9868 2024 Feb. 24.48680 V <13.0 SRXTU MEN 2460361.9458 2024 Feb. 21.44580 V <13.4 SRX Regards Daniel Jose Mendicini.Profesor de Física.Matricula Nro. 2019-6498. F.I.Q - U.N.L. E.N.S. N°32 Y 46.APFA - CODE - LIADA.http://dmendicini.wixsite.com/astronomySanta Fe, Argentina. +549 342 5444957.

1 0

[vsnet-alert 27996] TCP J17395720-2627410 Oph = Nova Oph 2024
by Viktor Cseh 12 Mar '24

12 Mar '24

Hi all! I photographed the nova in Ophiuchus today (11-Mar-2024 06:56:19 UTC) with a telescope from Chile. I used the T70 instrument with red filter and 4×60 sec exposition time. The nova was 9,78 magnitude the integrated picture. -- *Cseh Viktor*

1 0

[vsnet-alert 27995] TCP J03383192+2712288: new SU UMa-type (or WZ Sge-type) dwarf nova
by tonny.vanmunster＠gmail.com 11 Mar '24

11 Mar '24

Dear colleagues, I have just finished analysing my unfiltered CMOS observations of TCP J03383192+2712288 obtained on 2024, Mar 08/09 at CBA Belgium Observatory using a 0.40-m f/10.0 telescope and QHY-268M CMOS camera, and on 2024, Mar 10/11 at CBA Extremadura Observatory using a 0.40-m f/5.1 telescope and SX-46 CCD camera. In both cases, skies were not entirely clear. The resulting light curve clearly shows the presence of superhumps with an amplitude of 0.24 mag, establishing TCP J03383192+2712288 as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Lomb-Scargle, Conditional Entropy and PDM methods (Peranso 3.0) yields a combined superhump period of 0.0542 +/- 0.0010d. The object was at mag CV = 16.4 on Mar 10th. 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 --- 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/>

1 0

[vsnet-alert 27994] IK Leo: superhumps
by Taichi Kato 04 Mar '24

04 Mar '24

IK Leo: superhumps Itoh-san has shown that this object started showing superhumps on Mar. 2. There was some indication of growing superhumps earlier.

1 0

[vsnet-alert 27993] TCP J13530185+0522000: new SU UMa-type (likely WZ Sge) dwarf nova
by Taichi Kato 04 Mar '24

04 Mar '24

TCP J13530185+0522000: new SU UMa-type (likely WZ Sge) dwarf nova Itoh-san has shown that this object started showing superhumps on Mar. 2. The current period is 0.06041(4) d. The amplitude is 0.13 mag. The long waiting time suggests a WZ Sge star.

1 0

[vsnet-alert 27992] 1RXS J012750.5+380830 (UGSU:) outburst
by Kirill Sokolovsky 01 Mar '24

01 Mar '24

The dwarf nova of an uncertain subtype 1RXS J012750.5+380830 was found in outburst on the NMW ( https://scan.sai.msu.ru/nmw/ ) images obtained on 2024-02-29.7089 13.2 CV The previous outburst of 1RXS J012750.5+380830 was in October 2020 http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/24873 ASAS-SN lightcurve: https://asas-sn.osu.edu/sky-patrol/coordinate/a49973ba-269e-492f-b522-5d237… VSX record for 1RXS J012750.5+380830: https://www.aavso.org/vsx/index.php?view=detail.top&oid=132053 Best wishes, Kirill Sokolovsky, Stanislav Korotkiy, Vladimir Belousov, Nikolai Potapov

1 0

[vsnet-alert 27991] V745 Sco brightening
by Berto Monard 29 Feb '24

29 Feb '24

For what it's worth. Possibly the start of an outburst of V745 Sco as per recent observations at KKO JD / Vj / Ic 2460353.59 17.90 13.43 2460358.59 - 13.48 2460364.58 - 13.34 2460368.59 15.88 13.06 2460369.54 15.7: 13.0: 2460369.63 15.50 12.90 Berto Monard / CBA KKO

1 0

2024

2023

2022

2021

vsnet-alert