Cassini

[Orionid]

Opublikowano mapy zmian temperatury na  powierzchni Tytana w okresie 12 lat.

Although it moves in latitude, the maximum measured temperature on Titan remains around -292 degrees Fahrenheit (-179.6 degrees Celsius, 93.6 Kelvin), with a minimum temperature at the winter pole only 6 degrees Fahrenheit (3.5 degrees Celsius or Kelvin) colder. This is a much smaller contrast than exists between Earth's warmest and coldest temperatures, which can vary by more than 200 degrees Fahrenheit, or more than 100 degrees Celsius.

http://saturn.jpl.nasa.gov/photos/imagedetails/index.cfm?imageId=5309
http://www.pulskosmosu.pl/2016/02/23/mapy-zmian-temperatury-na-tytanie-w-ciagu-saturnianego-roku/

[Orionid]

Zmienna magiczna wyspa  na Tytanie

http://www.spacedaily.com/reports/New_photos_show_magic_island_on_Saturns_moon_999.html
http://www.pulskosmosu.pl/2016/03/03/aktywne-i-zmienne-morze-na-tytanie-na-zdjeciach-z-sondy-cassini/
http://www.pulskosmosu.pl/2016/03/05/czy-tytan-to-dla-surferow-nowy-raj-chyba-jednak-nie/

[Orionid]

Tetyda i Janus w pobliżu pierścieni Saturna

Tethys (660 miles or 1,062 kilometers across) is large enough to be spherical and to have varied geology, like chasms and smooth plains, along with some puzzling arc-shaped features (see PIA19637). Much smaller Janus (111 miles or 179 kilometers across) is irregularly shaped and has (so far) shown few signs of geologic activity apart from impact craters.

This view looks toward the sunlit side of the rings from about 1 degree above the ring plane. The image was taken in visible light with the Cassini spacecraft wide-angle camera on Nov. 23, 2015.

http://www.nasa.gov/image-feature/jpl/pia18356/different-worlds

[Orionid]

Enceladus widziany z odległości 79000 km.

http://www.nasa.gov/image-feature/jpl/pia18362/tilted-terminator

[Orionid]

Tethys i Rhea


The moons are named for sisters -- two Titans of Greek mythology. Although somewhat different in size, Rhea (949 miles or 1,527 kilometers across) and Tethys (660 miles or 1,062 kilometers across) are medium-sized moons that are large enough to have pulled themselves into round shapes. They are both composed largely of ices and are generally thought to be geologically inactive today.

https://www.nasa.gov/image-feature/jpl/pia18363/the-saturnian-sisters

[Slavin]

Zdjęcie to było zamieszczone w wątku w Marcu 2015. Znalazłem na FB jego kolorową wersję: Tytan, u dołu po lewej Rhea i po prawej (najmniejszy) - Mimas.

[Orionid]

Kratery na Dione

NASA’s Cassini spacecraft captures a crater duo on Saturn’s moon Dione that is superimposed on older, linear features. The upper of the pair, named Italus, is overprinted on a grouping of ancient troughs called Petelia Fossae. The lower crater, Caieta, sits atop a feature named Helorus Fossa.

https://astronomynow.com/2016/03/22/cassini-views-helorus-in-half-light/
http://www.pulskosmosu.pl/2016/03/22/helorus-w-polmroku/

[Orionid]

Najwyższy szczyt na Tytanie

Titan's tallest peak is 10,948 feet (3,337 meters) high and is found within a trio of mountainous ridges called the Mithrim Montes. The researchers found that all of Titan's highest peaks are about 10,000 feet (3,000 meters) in elevation. The study used images and other data from Cassini's radar instrument, which can peer through the obscuring smog of Titan's atmosphere to reveal the surface in detail.

"It's not only the highest point we've found so far on Titan, but we think it's the highest point we're likely to find," said Stephen Wall, deputy lead of the Cassini radar team at NASA's Jet Propulsion Laboratory in Pasadena, California.

http://www.jpl.nasa.gov/news/news.php?feature=6179
http://www.pulskosmosu.pl/2016/03/24/najwyzsze-wzgorza-na-tytanie/

[Orionid]

Księżyce Saturna mogą nie być takie stare

But how long ago was their birth? Cuk and his team used results from NASA's Cassini mission to help answer this question. The Cassini spacecraft has observed ice geysers on Saturn's moon Enceladus. Assuming that the energy powering these geysers comes directly from tidal interactions, and that Enceladus' level of geothermal activity is more or less constant, then the tides within Saturn are quite strong. According to the team's analysis, these would move the satellite by the small amount indicated by the simulations in only about 100 million years. This would date the formation of the major moons of Saturn, with the exception of more distant Titan and Iapetus, to the relatively recent Cretaceous Period, the era of the dinosaurs.

http://phys.org/news/2016-03-moons-saturn-younger-dinosaurs.html
http://www.pulskosmosu.pl/2016/03/25/ksiezyce-saturna-moga-byc-mlodsze-od-dinozaurow/

[Orionid]

Mapy Tytana w zakresie podczerwonym

Producing a seamless global map of Titan is a challenging task, because observing conditions can vary greatly between each flyby. Among these variations are changes in the angle of the sun with respect to the surface and in the spacecraft's viewing direction. Such variations can make it even more difficult to remove the effects of scattering and absorption of light by Titan's thick, hazy atmosphere. These effects can also influence how bright different areas of the surface appear. Seasonal changes may also have played a role in changing the appearance of Titan's surface over the course of Cassini's long mission. These factors create a complex problem that researchers are still working to solve.

http://saturn.jpl.nasa.gov/photos/imagedetails/index.cfm?imageId=5321
http://www.pulskosmosu.pl/2016/03/26/nowe-mapy-tytana-w-podczerwieni/

[Orionid]

Model wyjaśniający erupcje na oblodzonych księżycach Saturna

“I was very happy to see this new work by Kite and Rubin that brings to the fore a process that had escaped notice: the pumping of water in and out of the deep fractures of the south polar ice shell by tidal action,” said Carolyn Porco, head of Cassini’s imaging science team and a leading scientist in the study of Enceladus.

http://news.uchicago.edu/article/2016/03/28/computer-model-explains-sustained-eruptions-icy-moon-saturn
http://www.pulskosmosu.pl/2016/03/29/model-tlumaczy-dlugotrwale-erupcje-na-enceladusie/

[Dzamiila]

nowości od Cassiniego,

podobno sonda natrafiła na ślady "obcego" pyłu kosmicznego:
http://www.saturndaily.com/reports/Saturn_Spacecraft_Samples_Interstellar_Dust_999.html

[timbertodrewno]

Pył międzygwiezdny w układzie słonecznym to nic nowego. Taki sam pył rejestrowała sonda Ulysses i Galileo. Bardziej fascynująca jest czułość przyrządów. Przez 12 lat pracy sonda zarejestrował 36 ziaren pyłu międzygwiezdnego, po kilka rocznie. A warto zauważyć, że taki pył międzygwiezdny ma ziarna o rozmiarach rzędu 0,001 mm.

Nowością natomiast jest fakt, że Cassini jako pierwsza była w stanie zbadać skład chemiczny tych ziaren.

[Dzamiila]

i to właśnie rozumiałam pod hasłem "nowości od Cassiniego"

[Orionid]

Cassini nie potwierdza istnienia 9 planety

"W ostatnich dniach pojawiły się liczne informacje mówiące o tym, że tajemnicza anomalia w orbicie sondy Cassini mogłaby być wytłumaczona grawitacyjnym wpływem teoretycznej, masywnej, nowej planety w Układzie Słonecznym znajdującej się daleko za orbitą Neptuna. Choć istnienie proponowanej planety może zostać potwierdzone w inny sposób, nawigatorzy misji Cassini informują, że nie zaobserwowali żadnych odchyleń orbity sondy od czasu jej dotarcia do Saturna w 2004 roku."

http://www.pulskosmosu.pl/2016/04/09/hipotetyczna-planeta-9-nie-zaburza-orbity-sondy-cassini/
http://www.jpl.nasa.gov/news/news.php?feature=6200