[vsnet-alert 24468] SDSS J124058.03-015919.2 (AM CVn star): another rebrightening (July 18)

Fri Jul 24 02:59:43 JST 2020

 SDSS J124058.03-015919.2
https://www.aavso.org/vsx/index.php?view=detail.top&oid=132563

Another rebrightening occurred on 2020 July 18, according to
recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S
and Kochanek et al. 2017PASP..129j4502K) data:
https://asas-sn.osu.edu/light_curves/3b50a8c2-f138-497d-a630-801ea3273dc6

Clear skies,
Patrick
-------
     Am Freitag, 26. Juni 2020, 23:13:46 MESZ hat Tonny Vanmunster tonny.vanmunster at gmail.com via vsnet-outburst <vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp> Folgendes geschrieben:  

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SDSS J124058.03-015919.2 is currently undergoing yet another rebrightening. It was still at mag 17.6 CV yesterday (June 25.88 UT), but currently (June 26.88 UT) is bright at mag 14.83 CV.

Best regards

Tonny

-----Original Message-----
From: cba-chat [mailto:cba-chat-bounces at cbastro.org] On Behalf Of Tonny Vanmunster
Sent: maandag 15 juni 2020 11:38
To: 'Patrick Schmeer'; vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp; cvnet-outburst at yahoogroups.com; baavss-alert at yahoogroups.com; cba-chat at cbastro.org
Subject: (cba:chat) SDSS J124058.03-015919.2 (AM CVn star): another rebrightening

SDSS J124058.03-015919.2 is currently undergoing another rebrightening as indicated by my observations:

2020 Jun 13.889 UT: 17.48 (CV)

2020 Jun 14.874 UT: 15.72 (CV)

2020 Jun 14.876 UT: 15.68 (CV)

2020 Jun 14.877 UT: 15.63 (CV)

2020 Jun 14.878 UT: 15.61 (CV)

Best regards

Tonny 

--

Tonny Vanmunster

CBA Belgium Observatory

CBA Extremadura Observatory

www.cbabelgium.com

www.peranso.com

-----Original Message-----

From: vsnet-alert [mailto:vsnet-alert-bounces at ooruri.kusastro.kyoto-u.ac.jp] On Behalf Of Patrick Schmeer pasc1312-aavso at yahoo.de via vsnet-alert

Sent: zaterdag 6 juni 2020 11:56

To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp; vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp; cvnet-outburst at yahoogroups.com; baavss-alert at yahoogroups.com

Subject: [vsnet-alert 24324] SDSS J124058.03-015919.2 (AM CVn star): 5th rebrightening (June 2)

 SDSS J124058.03-015919.2 (UGWZ+IBWD)

https://www.aavso.org/vsx/index.php?view=detail.top&oid=132563

As expected, a fifth rebrightening occurred on 2020 June 2, as observed by Josch Hambsch (HMB):

https://www.aavso.org/apps/webobs/results/?star=SDSS+J124058.03-015919.2

Previous rebrightenings occurred on May 8, 13, 19, and 26.

The (main) superoutburst (not a "double superoutburst") was observed from April 27 until May 4.

Time-resolved photometry is still required.

Clear skies,

Patrick

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     Am Mittwoch, 27. Mai 2020, 19:55:54 MESZ hat 反保雄介 <tampo at kusastro.kyoto-u.ac.jp> Folgendes geschrieben:  

 SDSS J124058.03-015919.2: 4th rebrightening

Lasair detected its 4th rebrightening on 26th May, and also Moriyama-san reported an observation.

However, it is already below 15.8 mag on 27th by Kyoto Univ. Obs. and Moriyama-san.

Thus, as previous rebrightenings, this 4th rebrightening seems also a short outburst.

As the duration between short outbursts are 6~7 days but a timescale of outburst is about one day, continuous observations are encouraged to detect the next outburst.

YYYYMMDD(UT)

SDSSJ124058.03-015919.2 20200525.486 17.37C Ioh (Itoh, VSOLJ)

SDSSJ124058.03-015919.2 20200526.199 14.818g Lasair

SDSSJ124058.03-015919.2 20200526.247 14.955r Lasair

SDSSJ124058.03-015919.2 20200526.650 15.5:C Myy (Moriyama, VSOLJ)

SDSSJ124058.03-015919.2 20200527.613 <16.7:C Myy (Moriyama, VSOLJ)

SDSSJ124058.03-015919.2 20200527.646 <15.8CV KyotoU

https://lasair.roe.ac.uk/object/ZTF18acyerom/

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