Hi,
No sun today but here my two shots I ahve been able to make on 23rd and 24th of July 2020.
Takahashi FSQ 106-ED with ZWO ASI 1600MM PRO and filters RGB with 15 seconds exposure time. IMage of 23rd is a 33 image stack and image from 24th is a 45 image stack. Processed 100% in PixInsight
They are both 2150 pixels wide and 1625 pixels high. For full size new tab or window.
Comet C/2020 F3 Neowise July 23 and 24
Moderator: Montana
- rsfoto
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Comet C/2020 F3 Neowise July 23 and 24
regards Rainer
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
Observatorio Real de 14
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North 22° West 101°
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Re: Comet C/2020 F3 Neowise July 23 and 24
Hello Rainer.
Two interesting and well-captured images of Neowise.
Just been reading the article on spaceweather.com, which shows the three main colours of Green, Blue & wan yellow/grey.
You have (more or less) captured all three colours and their explanation for these colours is:-
"Now we can take a colour-coded tour of Comet NEOWISE:
The comet's head is green. This is a sign of diatomic carbon, C2, a gas which emits a verdant glow in the near-vacuum of interplanetary space.
The comet's ion tail is blue. Once again, carbon is involved. One of the most abundant gases in comets is carbon monoxide (CO). When CO flows away from a comet's nucleus, it is ionized by solar UV radiation. Carbon monoxide ions (CO+) glow blue when they recapture electrons from the Solar wind.
The comet's dust tail is wan yellow. It is, simply, the colour of Sunlight reflected from comet dust.
The two tails are nicely separated, revealing their individual colours, because they are guided by different forces. The gaseous ion tail is shoved directly away from the sun by solar wind; it acts as a kind of interplanetary windsock. The heavier dust trail, however, isn't so easily pushed around. Specks of dust are like bread crumbs dropped on the comet's orbit; they curve away from the ion tail, tracing the comet's "footsteps" instead of the local breeze."
So all in all, Neowise is giving us one of the best displays for so long, that it must rank one of the best of all time.
Thanks for sharing your superb images Rainer
Regards
Terry
Two interesting and well-captured images of Neowise.
Just been reading the article on spaceweather.com, which shows the three main colours of Green, Blue & wan yellow/grey.
You have (more or less) captured all three colours and their explanation for these colours is:-
"Now we can take a colour-coded tour of Comet NEOWISE:
The comet's head is green. This is a sign of diatomic carbon, C2, a gas which emits a verdant glow in the near-vacuum of interplanetary space.
The comet's ion tail is blue. Once again, carbon is involved. One of the most abundant gases in comets is carbon monoxide (CO). When CO flows away from a comet's nucleus, it is ionized by solar UV radiation. Carbon monoxide ions (CO+) glow blue when they recapture electrons from the Solar wind.
The comet's dust tail is wan yellow. It is, simply, the colour of Sunlight reflected from comet dust.
The two tails are nicely separated, revealing their individual colours, because they are guided by different forces. The gaseous ion tail is shoved directly away from the sun by solar wind; it acts as a kind of interplanetary windsock. The heavier dust trail, however, isn't so easily pushed around. Specks of dust are like bread crumbs dropped on the comet's orbit; they curve away from the ion tail, tracing the comet's "footsteps" instead of the local breeze."
So all in all, Neowise is giving us one of the best displays for so long, that it must rank one of the best of all time.
Thanks for sharing your superb images Rainer
Regards
Terry
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Re: Comet C/2020 F3 Neowise July 23 and 24
Hi Terry,EGRAY-OBSERVATORY wrote: ↑Sun Jul 26, 2020 1:02 am Hello Rainer.
Two interesting and well-captured images of Neowise.
Just been reading the article on spaceweather.com, which shows the three main colours of Green, Blue & wan yellow/grey.
You have (more or less) captured all three colours and their explanation for these colours is:-
"Now we can take a colour-coded tour of Comet NEOWISE:
The comet's head is green. This is a sign of diatomic carbon, C2, a gas which emits a verdant glow in the near-vacuum of interplanetary space.
The comet's ion tail is blue. Once again, carbon is involved. One of the most abundant gases in comets is carbon monoxide (CO). When CO flows away from a comet's nucleus, it is ionized by solar UV radiation. Carbon monoxide ions (CO+) glow blue when they recapture electrons from the Solar wind.
The comet's dust tail is wan yellow. It is, simply, the colour of Sunlight reflected from comet dust.
The two tails are nicely separated, revealing their individual colours, because they are guided by different forces. The gaseous ion tail is shoved directly away from the sun by solar wind; it acts as a kind of interplanetary windsock. The heavier dust trail, however, isn't so easily pushed around. Specks of dust are like bread crumbs dropped on the comet's orbit; they curve away from the ion tail, tracing the comet's "footsteps" instead of the local breeze."
So all in all, Neowise is giving us one of the best displays for so long, that it must rank one of the best of all time.
Thanks for sharing your superb images Rainer
Regards
Terry
Thanks for the comment and the great explanation of the colours. I read somewhere that also Sodium is involved for the Yellow tail.
https://en.wikipedia.org/wiki/C/2020_F3_(NEOWISE)
quotes from the text:
" By July, it also had developed a second tail. The first tail is blue and made of gas and ions. There is also a red separation in the tail caused by high amounts of sodium "
" On July 13, 2020, a sodium tail was confirmed by the Planetary Science Institute's Input/Output facility.[12] Sodium tails have only been observed in very bright comets such as Hale–Bopp and C/2012 S1 (ISON) "
regards Rainer
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
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Re: Comet C/2020 F3 Neowise July 23 and 24
Nice work, Rainer.
You captured every "part" (nucleus, ion/dust tail) quite nicely.
You captured every "part" (nucleus, ion/dust tail) quite nicely.
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Re: Comet C/2020 F3 Neowise July 23 and 24
Thanks Rainer for that web-link, which certainly does equate Neowise as being in the top-10 comets of recent times.
Regards
Terry
Regards
Terry