mercredi 3 août 2011

Elenin, Derniéres images


Voici les dernières images de la comète Elenin, comme il fallait s'y attendre, elles sont floues et inexploitables.
On ne saurait dire par exemple si Elenin est  un essaim d'astéroïdes ou si c'est un vulgaire bloc de glace.

Tehniquement, un astronome amateur aurait pu prendre ce cliché depuis la terre, ce n'était donc pas la peine d'utiliser la sonde Stereo B si c'est pour arriver à ce résultat.
La NASA affirme qu'elle sera visible à l'oeil nu dés la fin du mois, pourtant une sonde spatiale qui passe à proximité n'arrive pas à donner des images correctes.
J'ai l'impression que l'on a affaire à un gros foutage de gueule.

Edit : Dés demain, des clichés de meilleure résolution seront transmis, on attend de voir ce que ça donnera.

A few hours ago, the first images of the comet, obtained with the camera HI2-B of spacecraft STEREO-B, was available. Animation is created from the so-called beacon frames, which used for checking the accuracy of pointing and exposures settings . Original, full size frames will be downloaded to the Earth on August 4. At this time, the comet will appear on the images from HI-1B camera, which has higher resolution. The study of comets on the unique images taken with the STEREO spacecraft has just begun!

As Comet Elenin passed to within just 7 million kilometers of the STEREO (Behind) spacecraft, NASA rolled the spacecraft to take a look at it (Aug. 1, 2011) with its wide angle HI-2 instrument. Though the observation lasted only a little over an hour, the fuzzy looking comet can be seen moving across a small portion of the sky. STEREO will be taking these one-hour observations every day for almost the next week or more until it enters its nominal field of view, at which time we should enjoy continuous viewing of the comet. Over time, we expect the comet to be visible in the SOHO C3 coronagraph on September 23 for six days and possibly STEREO's COR2 coronagraph as well. The closest the comet will come to Earth is 0.23 AU (Astronomical Units), or approximately 34-million kilometers, so it poses no threat to us. We will attempt to keep this page updated with the latest observations.
We do expect the comet to appear to become significantly brighter over the next few days as it gets closer to the Sun-spacecraft line as a consequence of a process known as "foward-scattering". STEREO-B, which is far from Earth, happens to see this "back-lighting" effect as a consequence of its location relative to the comet, and is not indicative of a sudden change in the comet itself.
Russian astronomer Leonid Elenin discovered the comet last December at International Scientific Optical Network's robotic observatory near Mayhill, New Mexico.
From Earth, presently the comet is a faint smudge of light in deep sky exposures. By late August comet Elenin could be visible to the naked eye as a dim "fuzzy star" with a tail

1 commentaires:

ezekiel a dit…

ça vient de moi ou c'est plutôt super mauvais comme clicher pour une administration comme la nasa ?
c'est bizarre mais je le sent pas trop sur ce coup la

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