Comètes

Comet Lovejoy c'2014 imaged remotely from Coonabarbran, NSW. FSQ, FLI Proline 16803, 11 x 180s, Luminance channel.

https://www.facebook.com/atikcameras/videos/867383293320051/?pnref=story

Comète 46P Wirtanen

Position en direct

http://splendeursducielprofond.eklablog.fr/46p-wirtanen-une-comete-prometteuse-a148775798

Dimanche 16 décembre 2018 au soir, rendez-vous entre 22h30 et 23h, pour observer dans les meilleures conditions possibles la comète 46P Wirtanen, qui est l'une des plus proches à passer près de la Terre depuis les années 1950.

https://www.science-et-vie.com/ciel-et-espace/la-comete-wirtanen-croise-la-terre-cette-nuit-47191

https://www.stelvision.com/astro/observer-la-comete-wirtanen/

https://www.europe1.fr/sciences/ce-soir-levez-la-tete-comete-et-etoiles-filantes-vous-attendent-3821843

41P, la comète à ne pas manquer !

http://www.futura-sciences.com/sciences/actualites/comete-41p-comete-ne-pas-manquer-66894/

Comets and Asteroids

Comet picture of the day August 7, 2015

Comet 1P/Halley imaged by H. D. Curtis on June 6, 1910 and June 7, 1910 at Lick Observatory which recorded a plasma tail disconnection event on two nights. Dr. Curtis called the feature as a crooked streamer with a slightly twisted and spiral appearance. The disconnected tail has traveled further to the right in the second night image. It was not present in his images of June 5, 1910. He measured speed of the moving zig-zag on several nights and determined that the speed was increasing i.e. accelerating.

June 6, 1910 moving at 44 km/second.

June 7, 1910 moving at 70.1 km/second.

June 8, 1910 moving at 91.2 km/second.

This image appeared in an article published in Popular Astronomy in October 1910. Dr. Curtis' article on his observations appeared in June 1910 in Publications of the Astronomical Society of the South Pacific. Comet 1P/Halley had passed perihelion on April 20, 1910 at a distance of 0.587208 AU.

E.E. Barnard published the initial paper on the subject of tail disconnections to the astronomical community in 1920. In a Disconnection Event (DE) the entire plasma or ion tail disconnects from the head and a new ion tail develops.

Comets and Asteroids.

Coma² de la comète 67P/Churyumov-Gerasimenko telle que captée par OSIRIS

Crédit Nasa-JPL http://photojournal.jpl.nasa.gov/catalog/PIA18422

²La coma d'une comète est une sorte d’atmosphère assez dense entourant le noyau, elle est constituée d'un mélange de poussières et de molécule de gaz éjectées du noyau : essentiellement des molécules d'eau, de monoxyde de carbone (CO) et de dioxyde de carbone(CO2).

http://apod.nasa.gov/apod/ap150117.html

San Antonio Astronomical Association

Comet Lovejoy c'2014 imaged remotely from Coonabarbran, NSW. FSQ, FLI Proline 16803, 11 x 180s, Luminance channel.

Suivre la comète Lovejoy

http://article.wn.com/view/2015/01/08/Watch_New_Years_Comet_Lovejoy_Reach_Its_Peak/

Crédit Lorenzo Comolli

Traitement d'image et analyse de coma : Jacques Honnorat

Lovejoy, 2015

http://www.virtualtelescope.eu/2015/01/14/comet-c2014-q2-lovejoy-stunning-mosaic-13-jan-2015/

Stunning Comet ISON Photos Captured by Amateur Astronomer

A spectacular set of photos taken by an amateur astrophotographer chronicles the evolution of Comet ISON over the last few months, which has seen the much-hyped icy wanderer brighten so much that it's now visible to the naked eye.

"In September, ISON was just a smudge smaller than most stars," Mike hankey wrote SPACE.com in an email. "The tail, while visible, was short, faint and had little detail."

Hankey started imaging Comet ISON using a 14.5-inch RCOS telescope located at the Sierra Remote Observatories in Auberry, Calif. He spent roughly an hour each morning imaging the comet remotely from the California observatory while he was at home in Maryland.

Comet Ison photos:

This composite shows some of Mike Hankey’s observations of Comet ISON since he began imaging the comet in September.

Credit: Mike Hankey

by Nina Sen, SPACE.com Contributor | November 18, 2013 02:20pm ET

Red more: http://www.space.com/23593-comet-ison-photos-amateur-astronomer.html

Lefteris Velissaratos

28 août 2014 · Modifié ·

The arrow missed the Heart.

The internal Journey of Comet/2014 E2 Jacques in the path of the spectacular NGC896 nebula. That's something you don't see in a life time...

Acquisition: 21/8

RGB 120sec x 4 1x1 bin of each color.

LUM 300sec x 4 1x1 bin for the tail, plus 5 x 120sec