Thank you Peter.
I didn't get a good result of stacking with DSS because of signal lack. So I tryed IRIS, with Add tool, after align by One Star. The image has the photos at 19:01, 19:04, 19:13 and 19:20 hs.
The image is B&W and they were converted from CR2 to FIT in IRIS, too. The initial goal was only measure the magnitude.
Noise cleaning and adjust of level and bright/contrast was in Photoshop.
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