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Nice result Frederic , according to LCG the magnitude is now around 14.4 ... not a bad performance with a modest Newton skywatcher 250mm. .

Hi Robin, Many thanks for the data you are sharing. It shows a significant difference between the results computed with a 10pxl binning and 40pxl binning. Based on rough measurement on your graph, the impact is about 60% difference in the computed ratio. Considering this windows as the minimum and m...

Hi Robin, Impressive and smart analysis ! I am sure we will all learn from these observations of that unusual event . It clearly demonstrate why we need to be very careful in comparing data from multiple observers at different time. However, if we assume that most observers (unless specified) will f...

Ouups...Merci Benjamin pour ces remarques et précisions de vocabulaire bien nécessaires pour la clarté de ces propos trop "nébuleux". Il est bon en effet de souligner ce qui pourrait être l'aspect exponentiel de cette décroissance sur la période considérée. A première vue (peut-être trompe...

Bonjour Hubert, Merci pour tes commentaires et suggestions. J’ai refait le graphe avec la distance comète/soleil en abscisse. Tout cela est bien sûr très approximatif mais l’aspect semble pratiquement identique. D'autres analyses plus précises en haute resolution* pourront donner des informations pl...

Hello, This Na story is quite fascinating. The available measurements in low definition from July 09 to July 22. On my spectra of July24 and 26, if present, that emission is near the noise level . To better understand if this make sense, I did a quick evaluation of the relative intensity trend based...

Bonjour Etienne, effectivement cette date interpelle... Mais je profite de ton message pour souligner la qualité de ton spectre basse définition du 22/07/20 publié dans la base de donnée des observateurs de comètes : https://lesia.obspm.fr/comets/lib/display-obs1.php?Num=22191 Il me semble montrer, ...

Thank Eric, for this spectra showing Na emission on July22. We are the only one to look to that dynamic… Just discovered these 2 messages. The first is from Taiwan using Alpy and Lisa, the second is from Himalaya… ATel 13886 Optical spectra on July 10 taken by the 20cm telescope, Aply 600 spectrogra...

Hi Robin, Thanks for your superb picture showing clear evidence of Na emission at high resolution on july20. A good quality, low resolution spectra, taken near the same date would probably shows a single "blended line". This comet is a good opportunity for me to better understand, in pract...

Hello Robin, Thank for your useful comment. As per your recommendation, I was showing a guider image in a previous message. My point here was just to take opportunity of the high density of the received signal to better understand the "convolution" effect of a low definition spectra. The h...