Once again many thanks to Oscar Martín Mesonero (Salamanca, Spain) for providing me raw files of Comet C/2020 F3 (NEOWISE) he made with a 550D and ED80 telescope. This time on 2020 July 4.247 UT, and this morning there was a convenience mag 6.2 A0 reference star next to the comet, which allowed a more confident estimate. Using Maxim DL I extracting the G channel and made 2 measurements using 1.5' and 3.0' diameter photometric apertures positioned as shown in the image. This yielded Mv=2.0 and 1.5 respectively. I have also labelled the reference star in the image. |
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