[vsnet-alert 24116] ASASSN-20ap: superoutburst (Jan. 17 - Feb. 5) with at least two rebrightenings (Feb. 19 and 24)

Mon Mar 30 18:05:08 JST 2020

 ASASSN-20ap (UGSU)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=1540336

Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S
and Kochanek et al. 2017PASP..129j4502K) data and light curve:
https://asas-sn.osu.edu/light_curves/3f41d023-32cb-4056-90e3-94929b1babea

Two apparent rebrightenings in ZTF data (unfortunately
without attached images):
https://lasair.roe.ac.uk/object/ZTF20aagqrbx/

Regards,
Patrick
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     Am Montag, 20. Januar 2020, 02:27:09 MEZ hat Tonny Vanmunster tonny.vanmunster at gmail.com via vsnet-alert <vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp> Folgendes geschrieben:  

 Dear colleagues,

I have collected 3 nights of unfiltered CCD observations of ASASSN-20ap (2020, Jan 17/18, 18/19, 19/20) covering 705 observations obtained over a time span of 15.6 hours. Observations were made at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope and STT-3200ME CCD camera, under mostly clear skies. 

The resulting light curve shows the presence of a superhump-like signal - during each of the 3 consecutive nights - with an amplitude of 0.05 mag. A period analysis using the ANOVA, Lomb-Scargle and PDM methods (Peranso),  yields a combined superhump period of 0.0618 +/- 0.0014d. The object was at mag 15.1 (CV) on Jan 20th. 

Observations will be sent to AAVSO, CBA and VSNET for further analysis. 

Follow-up observations are highly recommended to further study the evolution of superhumps in this system.

Best regards
Tonny

--
Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
www.cbabelgium.com
www.peranso.com