ВНИМАНИЕ! На форуме начался конкурс - астрофотография месяца ИЮЛЬ!
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Title LIFE, Life Investigation For Enceladus Author Block Peter Tsou1, I. Kanic1, C. Lane1, C. Sotin1, L. Spilker1, T. Spilker1, N. Strange1 1JPL. Abstract Enceladus, a small icy moon of Saturn, is one of NASA outer planet life search targets and unique in its current active jets. As with comets, this enables a low-cost flyby sample return mission like STARDUST. Samples from Enceladus will expand our in-depth knowledge of “life” and allow us to effectively plan for future missions.Cassini found Enceladus’ jets composed of fine icy particules and hydrocarbons. Saturn’s E ring is sustained by these jets for at least the last 300 years. Clearly there is a subsurface heat source generating such jets. Several theories for the origin of life on Earth would also apply to Enceladus; thus, obtaining the samples from the plume will provide breakthrough understandings of the nature of current or past life markers.The highly detailed analyses of Apollo and STARDUST samples revolutionized our knowledge of the Moon and comets and provided fundamental insights into remarkable processes that occur early in the formation of the Solar System. These in-depth analyses are not possible with astronomical remote sensing or in-situ instrumentations. Since the duration of these plumes is unknown, it is imperative to capture these samples by the earliest flight opportunity- the Discovery AO by the fall of 2009.For LIFE, we have a trajectory to encounter the plume at less than 4 km/s ensuring a more gentle capture of organics than STARDUST at 6 km/s. With less than 14-year mission duration, the samples can be returned to Earth before 2029. By capitalizing on the STARDUST heritage of design-to-cost mindset, the mission cost can be controlled. For cost reduction, the upcoming Discovery AO offers unique free ASRGs and allows the use of Jupiter for gravity assist.
Борислав, на анимации видно, что кассини приближается к гейзеру. Может были проведены какие-то анализы извергающегося в-ва?
With E7 being the first equatorial flyby through the Enceladus plume, and at a lower velocity than earlier inclined flybys, INMS will achieve very high signal-to-noise measurements of the gases in the plume, and will look for structure in the gases associated with the jets seen by ISS, UVIS and CDA. Measurements should provide high enough signal-to-noise to allow INMS to discriminate between N2 and CO; distinguishing between these two species has been difficult in the past.
"Кассини" разглядел полярное сияние Сатурна.http://www.lenta.ru/news/2009/11/25/cassini/
Ещё картинки от последнего пролёта Кассини вблизи Энцелада 21 ноября (взято из http://ciclops.org/view_event/120/Enceladus_Rev_121_Flyby_Raw_Preview):
И ещё:
Вот бы хоть одну трещину разглядеть, через которую вода выливается на поверхность...
Очевидно, жидкая фаза не долетает до поверхности, превращаясь в снег.
Kieffer S. W. * Lu X. McFarquhar G. Wohletz K. H.Ice/Vapor Ratio of Enceladus’ Plume: Implications for Sublimation [#2261]The ice/vapor ratio for the Enceladus’ plume, using the originally reported data ISS and UVIS data should be 0.2, not 0.4. The corrected data are compatible with sublimation. Conclusions about the needfor a liquid reservoir need to be reexamined.
Цитата: Droog_Andrey от 26 Ноя 2009 [22:04:10]Очевидно, жидкая фаза не долетает до поверхности, превращаясь в снег.Это не так. Немного водного пара в гейзерах тоже обнаруженно.
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Тема: "Кассини-Гюйгенс" (Прочитано 650882 раз)
