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  4. » Wirtanen: The Comet of Christmas

 
Wirtanen: The Comet of Christmas...

Sistema Solare

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Wirtanen: The Comet of Christmas sent on December 17, 2018 (21:36) by Stefano_C. 22 comments, 1228 views.

La cometa 46P/Wirtanen, ribattezzata cometa di Natale (2018) dai giornalisti, in quanto il periodo di massima visibilità cade nel mese di Dicembre quest'anno Molto grande, (ben più della luna piena), vista la grande vicinanza alla terra nel momento del perielio la cometa occupa una fetta significativa del cielo. Purtroppo la prospettiva sotto la quale la vediamo non permette di vedere bene la (debole) coda che potrebbe avere. Nella foto si nota un leggero accenno di anticoda. Purtroppo nonostante la grande dimensione la cometa è rimasta molto debole come luminosità, quindi è si e no visibile in questi giorni ad occhio nudo, solo da cieli bui, in distolta preferibilmente. Le previsioni la davano un po' più brillante, ma così non è stato. Solo con foto a lunga posa è possibile notare la vera grande dimensione della chioma, verde a causa della ionizzazione del C2 presente sulla superficie ghiacciata, e rilasciato a causa del calore che la cometa riceve dal sole vicino al perielio La foto è presa con un tempo di scatto di circa 1 ora, con due elaborazioni distinte, una centrata su cometa e una su stelle, in modo da vedere tutto fermo e poter apprezzare anche le belle pleiadi nel campo #stars #lungheesposizioni #nightphoto #Cometa


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avatarjunior
sent on December 17, 2018 (21:55) | This comment has been automatically translated (show/hide original)

Hi Stefano. If the comet, as a whole, appears larger than the Moon, the moon being about 30 times closer (at least yesterday) This means that the dust and gas cloud that we see is really huge... or not? :-o

avatarsenior
sent on December 17, 2018 (22:11) | This comment has been automatically translated (show/hide original)

The hair (and especially the tail) of comets can become very very large.
the tail of the Hale-Bopp if I remember correctly was more than 50 million km, that of Hyakutake more
The physical dimension of the comet instead is very small (I mean the solid part). About 1km for this, about forty for the Hale Bopp which is one of the most Great observed

avatarsenior
sent on December 17, 2018 (22:15) | This comment has been automatically translated (show/hide original)

Always images of the highest level bravo!

avatarjunior
sent on December 17, 2018 (22:16) | This comment has been automatically translated (show/hide original)

Yes, unbelievable. It's hard to imagine certain dimensions... and they're still nothing!

avatarsenior
sent on December 17, 2018 (22:19) | This comment has been automatically translated (show/hide original)


always images of the highest level bravo! /QUOTE
Thank you ;-)
It is difficult to imagine certain dimensions... and they are still nothing! /QUOTE
Very true!

avatarsupporter
sent on December 17, 2018 (22:58) | This comment has been automatically translated (show/hide original)

Great Nice :-)

avatarjunior
sent on December 17, 2018 (23:36) | This comment has been automatically translated (show/hide original)

Excellent Stefano, great job, I think more could not get ;-)
If I remember correctly, this comet has its aphelion near the orbit of Jupiter,
which may in the future suffer the gravity of the gas giant, varying its trajectory,
sin too long times in astronomy :-)
Anyway congratulations really, always pictures at the top

avatarsenior
sent on December 18, 2018 (6:05) | This comment has been automatically translated (show/hide original)

Thanks Flo and Canopo!
It is periodic to "short period".. but short on astronomical scale
for quite a few years will not be enough to see it so bright because the next Perieli will not coincide with a distance from the ground so low.
We keep dreaming about a new Hale Bopp, meanwhile let's enjoy this "Christmas season" and hope that at Christmas, when the distance will be increased a little and the brightness lowered, the prospect allows us to see a little ' tail

avatarsupporter
sent on December 18, 2018 (9:19) | This comment has been translated

MrGreen

user28555
avatar
sent on December 18, 2018 (11:16) | This comment has been automatically translated (show/hide original)

Splendid shooting, congratulations.
A greeting, Claudio :-P

avatarsenior
sent on December 18, 2018 (14:48) | This comment has been automatically translated (show/hide original)

Excellent accomplishment
Congratulations
Hello
Helium

avatarsenior
sent on December 18, 2018 (15:05) | This comment has been automatically translated (show/hide original)

Beautiful shot, congratulations! :-)
A greeting
Maurizio

avatarsenior
sent on December 18, 2018 (15:27) | This comment has been translated

Thank you boys!

avatarsenior
sent on December 19, 2018 (7:49) | This comment has been automatically translated (show/hide original)

Stupendous, it is absolutely one of the most beautiful I have seen for this conjunction, which also detail on the comet!
What pose did you do?

avatarsenior
sent on December 19, 2018 (7:53) | This comment has been automatically translated (show/hide original)

Thank you Gianluca.
about one hour of total laying frames from 1 minute to f2.8
double alignment on Comet and on Stars for having both stationary

avatarjunior
sent on December 19, 2018 (22:11) | This comment has been automatically translated (show/hide original)

Beautiful, congratulations, as already said the most beautiful view on the comet 46p.
If I can ask you: How did you align multiple shots and with what lens did you shoot?
Hello
Caesar

avatarsenior
sent on December 20, 2018 (6:43) | This comment has been automatically translated (show/hide original)


avatarjunior
sent on December 20, 2018 (10:26) | This comment has been automatically translated (show/hide original)

Thank you very much for the detailed reply Stefano!
I'm approaching even the astronomical photo, I have a staradventurer with which I hope to start to shoot something nice, your info have been invaluable, thanks again!
Caesar

avatarsupporter
sent on December 20, 2018 (10:35) | This comment has been automatically translated (show/hide original)

Excellent capture, not easy, Stefano, congratulations! :-)
wishes for a serene Christmas and happy holidays.
Raphael

avatarsenior
sent on December 20, 2018 (15:13) | This comment has been automatically translated (show/hide original)

Thank you.
wishes to you too!


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