Hi,
I draw your attention to the strange outburst detected in Sagittarius and described by CBET #3140 http://www.cbat.eps.harvard.edu/iau/cbe ... 003140.txt
The light curve show a long and slow outburst (rise and decline)
Here's a spectrum from one of the links of CBET # 3140
François Teyssier
Outburst "Nova 2012 Sgr #2"
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Outburst "Nova 2012 Sgr #2"
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr