[vsnet-alert 22231] ASASSN-18mp: new eclipsing SU UMa type (or WZ SGe type) dwarf nova - orbital and superhump period

[Tonny Vanmunster tonny.vanmunster@gmail.com via vsnet-alert]

Dear colleagues,

 

I have concluded the analysis of my 2018, Jun 14/15 unfiltered CCD
photometry session of ASASSN-18mp. Observations were made at CBA Extremadura
Observatory in Spain,  using a 0.40-m f/5.1 telescope and Trius SX-46 CCD
camera, under a very clear sky. As announced in my message earlier today,
the resulting light curve shows the presence of eclipses with an eclipse
depth of 0.66 mag. Based on two mid-eclipse timings, I find an orbital
period Porb = 0.0623 +/- 0.0007d.

 

The eclipses are superimposed on very beautiful double-waved superhumps,
indicating that the object is either an eclipsing SU UMa type dwarf nova, or
an eclipsing WZ Sge type dwarf nova (UGSU+E or UGWZ+E). The superhumps have
an amplitude of 0.24 mag. A period analysis using the ANOVA, Lomb-Scargle
and PDM methods (Peranso), yields a combined superhump period Psh = 0.0624
+/- 0.0011d. 

 

The object was at mag 15.6 (CV) on Jun 15th.  Follow-up observations are
strongly recommended to further refine Porb and Psh.

 

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

 

Best regards
Tonny

--

Tonny Vanmunster
CBA Belgium Observatory

CBA Extremadura Observatory  

 <http://www.cbabelgium.com/> www.cbabelgium.com
 <http://www.peranso.com/> www.peranso.com