[vsnet-alert 22050] CORRECTION: ASASSN-15me [instead of ASASSN-15md] is new SU UMa type dwarf nova

Thu Apr 5 05:07:53 JST 2018

Dear colleagues,

The below outbursting object is NOT ASASSN-15md, but ASASSN-15me. Both objects were swapped in the AAVSO VSX database, from which I retrieved my coordinates for the observing session. I have been informed by the AAVSO staff that the error meanwhile has been corrected. 

The outbursting object ASASSN-15me, which is now identified as an SU UMa type dwarf nova, is positioned at RA = 18h 06m 34.11s,  Dec = +09° 51’ 32.5” (J2000.0).

Best regards

Tonny

From: cba-chat [mailto:cba-chat-bounces at cbastro.org] On Behalf Of Tonny Vanmunster
Sent: zaterdag 31 maart 2018 19:28
To: cba-chat at cbastro.org; tonny.vanmunster at cbabelgium.com; 'Taichi Kato'; 'ALERT, VSNET'; vsnet-campaign-dn at ooruri.kusastro.kyoto-u.ac.jp; vsnet-newvar at ooruri.kusastro.kyoto-u.ac.jp; vsnet-newvar at yahoogroups.com; 'vsnet-outburst'; vsnet-outburst at yahoogroups.com
Subject: (cba:chat) ASASSN-15md: new SU UMa type dwarf nova

Dear colleagues,

I have just concluded the analysis of my 2018, Mar 30/31 unfiltered CCD photometry session of ASASSN-15md. Observations were made at CBA Belgium Observatory,  using a 0.40-m f/10.0 telescope and ST-10XME CCD camera, under a sky with strong moonlight and increasing clouds. The resulting light curve covers 0.09d only (small time span), yet it shows the presence of a superhump with an amplitude of 0.26 mag. A period analysis using the ANOVA, Lomb-Scargle and PDM methods (Peranso), yields a very preliminary combined superhump period of 0.064 +/- 0.005d, hence establishing this object as a new SU UMa type dwarf nova. The object was at mag 15.92 (CV) on Mar 30th.  

Follow-up observations are strongly recommended to more accurately establish the superhump period. CBA Belgium Observatory will be clouded out tonight.

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

Best regards
Tonny

-- 

Tonny Vanmunster
CBA Belgium Observatory

CBA Extremadura Observatory – NEW !!!
 <http://www.cbabelgium.com> www.cbabelgium.com
 <http://www.peranso.com> www.peranso.com