"Кассини" !

[tnt22]

CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 34 мин. назад

Crossing confirmed: we've completed the 8th ring dive of our #GrandFinale. More: https://go.nasa.gov/2qcf2Vx  #SaturnSaturday

[ОАЯ]

Гравитация немного сплющила бы по радианту поля, но оказалась бы слабее моего коэффициента поверхностного натяжения жидкой Луны.

[tnt22]

CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 4 ч. назад

#Saturn's two-toned moon Iapetus is a world of contrasts. Details: https://go.nasa.gov/2sfp0Js 

https://saturn.jpl.nasa.gov/resources/7687/

Puzzled Iapetus

Спойлер

Photojournal: PIA21332

[свернуть]

June 12, 2017

Iapetus is a world of contrast, with light and dark regions fitting together like cosmic puzzle pieces.

Cassini Regio on Iapetus (914 miles or 1,471 kilometers across) is covered in a layer of dark, dusty material creating a stark contrast to the much brighter region that surrounds it. This leads to the moon's distinctive, two-toned appearance. To learn more about the cause of the contrast between regions, see Encountering Iapetus.

Спойлер

This view looks toward Saturn-facing hemisphere of Iapetus. North on Iapetus is up and rotated 20 degrees to the right. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on March 11, 2017.

The view was obtained at a distance of approximately 1.6 million miles (2.6 million kilometers) from Iapetus. Image scale is 9 miles (15 kilometers) per pixel.

The Cassini mission is a cooperative project of NASA, ESA (the European Space Agency) and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.

For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov and http://www.nasa.gov/cassini. The Cassini imaging team homepage is at http://ciclops.org.

Credit

NASA/JPL-Caltech/Space Science Institute

ENLARGE

Downloads

Original
28.1 KB
image/tiff

Download

[свернуть]

[tnt22]

CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 27 мин. назад

We're starting our 9th #GrandFinale orbit right now. The agenda includes observations of #Saturn's aurora and rings: https://go.nasa.gov/2rezw0g 

https://saturn.jpl.nasa.gov/mission/grand-finale/grand-finale-orbit-guide/#Orbit_09

IN PROGRESS: Orbit 279 - June 13 - 20

[TH]Event[/TH][TH]Date[/TH][TH]Spacecraft Time (UTC)[/TH][TH]Local Time (PDT)[/TH][TH]Notes[/TH]

Apoapse	Jun 13	6:24 p.m.	11:24 a.m.
Ring Crossing #9	Jun 16	11:52 p.m.	4:52 p.m.
Downlink	Jun 17	12:05 p.m.	5:05 a.m.	Estimated Earth Received Time (ERT) is 6:20 a.m. PDT on Jun 17.

[/li]
• During this orbit, Cassini's Ultraviolet Imaging Spectrograph (UVIS) observes Saturn's northern aurora, attempting to capture the entire auroral oval over several observations. The Composite Infrared Spectrometer (CIRS) observes the aurora at the same time.
• Cassini's Ion and Neutral Mass Spectrometer (INMS) takes priority during ring-plane crossing, measuring the density and composition of neutral particles in that region to study the relationship between Saturn's rings and the planet's atmosphere. INMS also measures ions such as O2+ created on the surface of the rings and transported along field lines to other locations.
• The Cosmic Dust Analyzer (CDA) samples ring particles around ring-plane crossing.
• The spacecraft's imaging cameras, the Imaging Science Subsystem (ISS), takes a special photo of the rings from the inside out around ring-plane crossing.
• During this orbit, Cassini gets within 2,080 miles (3,350 kilometers) of Saturn's 1-bar level. Cassini also passes within 2,710 miles (4,360 kilometers) of the inner edge of Saturn's D ring.
  

[zandr]

https://ria.ru/science/20170613/1496371325.html

"Кассини" передал последние фотографии "черно-белой" луны Сатурна

//
© NASA / JPL-Caltech/ Space Science Institute
МОСКВА, 13 июн – РИА Новости. Зонд "Кассини" передал на Землю последние снимки Япета – необычной луны Сатурна, "темная" сторона которой окрашена в белый цвет, а "светлая" – в багрово-черный тон, сообщает Лаборатория реактивного движения НАСА.
Япет является одной из первых лун Сатурна, которые были открыты еще в конце 17 века тезкой зонда НАСА, итальянским астрономом Джиованни Кассини. Наблюдая за ней и периодически "теряя" Япет, Кассини заметил, что полушария этой луны были окрашены в противоположные цвета — "солнечная" сторона Япета была покрыта темными, черно-красными породами, а "темное" полушарие луны было девственно белым.
Эта загадка была раскрыта лишь через три века уже зондом "Кассини". Первые снимки Япета, полученные его камерами в 2007 году, показали, что эта луна Сатурна стала "черно-белой" благодаря потокам пыли с других спутников планеты-гиганта. Эта пыль постоянно осаждается на "солнечной" стороне Япета и помогает лучам светила растапливать ее льды и переносить эту воду на светлую сторону.
Новые фотографии Япета были получены "Кассини" в один из последних "нырков" через кольца Сатурна, с расстояния в примерно 2,6 миллиона километров от поверхности Япета. На этих снимках можно увидеть не только "регион Кассини", темное пятно на поверхности "черно-белой" луны, но и ряд крупных кратеров у его полюсов и необычную "борозду" на экваторе Япета, аналогов которой нет ни на одном другой луне Солнечной системы.
На этой неделе "Кассини" начинает свой девятый виток через "дыру" между кольцами Сатурна и атмосферой планеты, в рамках которой зонд НАСА попытается получить снимки полярных сияний в северном полушарии Сатурна, изучит химический состав его колец и получит их фотографии "изнутри".
По словам специалистов НАСА, последние два пролета через этот промежуток прошли гораздо проще для зонда, чем они ожидали, и сейчас они перестали использовать антенну "Кассини" в качестве щита, защищающего космический аппарат от пыли и микроастероидов. Если с зондом ничего не произойдет в последующие недели и месяцы, то миссия официально завершится 15 сентября, когда "Кассини" упадет в атмосферу Сатурна и получит уникальные данные по ее строению и составу.

[SashaBad]

Северное лето на Титане
https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA21615

Cassini показал яркие облака метана, дрейфующие в летнем небе Титана, наряду с темными углеводородными  озерами и морями, сгруппированными на поверхности вокруг северного полюса.
По сравнению с ранними изображениями, большая часть поверхности в высоких широтах северного полушария луны теперь освещается солнцем. (См PIA08363 для представления в северном полушарии с 2007 года) Летнее солнцестояние в системе Сатурна произошло 24 мая 2017 года.
Изображение было получено с космическим аппаратом Cassini узко угольной камерой 9 июня 2017 года, использовался спектральный фильтр, преимущественно пропускающий волні ближнего инфракрасного света с центром в точке 938 нм. 

Cassini получил это изображение с расстояния около 315000 миль (507,000 км) от Титана.

[tnt22]

CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 14 июн.

#Saturn is easy to spot in the evening sky right now; here's how: https://go.nasa.gov/2sxYZpq 

https://saturn.jpl.nasa.gov/news/3072/saturn-at-opposition/

| June 13, 2017

Saturn at Opposition

Jane Houston Jones

Спойлер

To see cool details, you'll need a telescope.

[свернуть]

Saturn reaches opposition on June 15, when Saturn, Earth and the sun are all in a straight line, with Earth in the middle.


Saturn reaches opposition on June 15, when Saturn, Earth and the sun are all in a straight line, with Earth in the middle.
 
Opposition provides the best and closest views of Saturn and several of its brightest moons.

If you just see one, that's Titan. Titan is 50% larger than our own moon. It orbits Saturn about every 16 Earth days. Our moon takes 27.3 days to orbit Earth.

Through a telescope you'll be able to compare the cloud bands on both Saturn and Jupiter.
Saturn's cloud bands are fainter than the bands of Jupiter. On Saturn you'll see delicate shades of cream and butterscotch, while Jupiter's bands are shades of white, rust and ochre.

A telescope will also show Saturn's rings tilted toward Earth about as wide as they get:  26.6 degrees.
The sunlight reflecting off the ring particles makes the rings look even brighter.

You'll also have a ring-side view of the Cassini division, discovered in 1675 by Giovanni Domenico Cassini, namesake of NASA's Cassini spacecraft.

The spacecraft has been orbiting Saturn since 2004.  Cassini is on a trajectory that will eventually plunge into Saturn's atmosphere and end Cassini's mission on September 15, 2017.

[tnt22]

https://saturn.jpl.nasa.gov/resources/7694/

Northern Summer on Titan

Спойлер

Photojournal: PIA21615

[свернуть]

June 14, 2017

NASA's Cassini spacecraft sees bright methane clouds drifting in the summer skies of Saturn's moon Titan, along with dark hydrocarbon lakes and seas clustered around the north pole.

Compared to earlier in Cassini's mission, most of the surface in the moon's northern high latitudes is now illuminated by the sun. (See here for a view of the northern hemisphere from 2007.) Summer solstice in the Saturn system occurred on May 24, 2017.

The image was taken with the Cassini spacecraft narrow-angle camera on June 9, 2017, using a spectral filter that preferentially admits wavelengths of near-infrared light centered at 938 nanometers. Cassini obtained the view at a distance of about 315,000 miles (507,000 kilometers) from Titan.

The Cassini mission is a cooperative project of NASA, ESA (the European Space Agency) and the Italian Space Agency. The Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.

For more information about the Cassini-Huygens mission visit https://saturn.jpl.nasa.gov and https://www.nasa.gov/cassini.
 
Credit

NASA/JPL-Caltech/Space Science Institute
 
ENLARGE

Downloads
 
Original
7.61 MB
image/png

Download

[tnt22]

CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 55 мин. назад

Ship's log: get the latest update from the Saturn system with our weekly significant event reports -- https://go.nasa.gov/2rm2GdG 

Спойлер

[свернуть]

Cassini Significant Events 6/07/17 - 6/13/17

[tnt22]

What's Up for June 2017

NASA Jet Propulsion Laboratory

Опубликовано: 14 июн. 2017 г.

Plan a planet party and compare Saturn and Jupiter! This video shows where and when to point your telescope or binoculars to see these planets and their largest moons. For more astronomy events, check out NASA's Night Sky Network at https://nightsky.jpl.nasa.gov/.

(2:27)

[tnt22]

CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 3 мин. назад

Happening now: we're closing in on our 9th ring dive, as simulated here in @NASA_Eyes. Download at: http://eyes.nasa.gov/eyes-on-cassini.html ...

[tnt22]

CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 4 мин. назад

9 lives: we've completed our 9th dive between Saturn & its rings, as simulated here in @NASA_Eyes. More science coming up.

[tnt22]

CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 3 ч. назад

Waves and kinks in #Saturn's rings, shaped by the planet's moons. Details: https://go.nasa.gov/2tkkU0I 

https://saturn.jpl.nasa.gov/resources/7691/

Grooves and Kinks in the Rings

Спойлер

Photojournal: PIA21333

[свернуть]

June 19, 2017

Many of the features seen in Saturn's rings are shaped by the planet's moons. This view from NASA's Cassini spacecraft shows two different effects of moons that cause waves in the A ring and kinks in the F ring.

The A ring, which takes up most of the image on the left side, displays waves caused by orbital resonances with moons that orbit beyond the rings. Kinks, clumps and other structures in the F ring (the small, narrow ring at right) can be caused by interactions between the ring particles and the moon Prometheus, which orbits just interior to the ring, as well as collisions between small objects within the ring itself.

This view looks toward the sunlit side of the rings from about 22 degrees above the ring plane. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on March 22, 2017.

Спойлер

The view was acquired at a distance of approximately 63,000 miles (101,000 kilometers) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 7 degrees. Image scale is 1,979 feet (603 meters) per pixel.

The Cassini mission is a cooperative project of NASA, ESA (the European Space Agency) and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.

For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov and http://www.nasa.gov/cassini. The Cassini imaging team homepage is at http://ciclops.org.

Credit

NASA/JPL-Caltech/Space Science Institute

ENLARGE

Downloads
 
Hi-res Image
494 KB
image/png

Download

[свернуть]

[tnt22]

https://saturn.jpl.nasa.gov/mission/grand-finale/grand-finale-orbit-guide/#Orbit_10

IN PROGRESS: Orbit 280 - June 20 - 26

[TH]Event[/TH][TH]Date[/TH][TH]Spacecraft Time (UTC)[/TH][TH]Local Time (PDT)[/TH][TH]Notes[/TH]

Apoapse	Jun 20	5:26 a.m.	10:26 p.m. (Jun 19)
Ring Crossing #10	Jun 23	10:54 a.m.	3:54 a.m.
Downlink	Jun 23	10:54 a.m.	3:54 a.m.	Cassini will be communicating with Earth during the ring crossing. Estimated Earth Received Time (ERT) is 5:09 a.m. PDT on June 23.

[/li]
• During this orbit, Cassini's Composite Infrared Spectrometer (CIRS) observes Saturn's moon Dione to better understand the moon's temperatures and to study the composition and structure of the moon's surface material.
• Cassini's Radio Science Subsystem (RSS) performs another occultation of Saturn's ring system and runs a gravity experiment to study Saturn's gravitational field in detail. The experiment seeks to measure how spherical Saturn's gravity field is. Deviations from a spherical shape reveal how the density within Saturn varies with depth and how surface winds influence lower atmospheric depths. In addition, Cassini simultaneously feels the gravitational pull of the rings (the B-Ring, in particular). Scientists should be able to determine the rings' mass very accurately from the data collected on this pass.  The rings' mass helps scientists determine the age of the ring system.
• During the radio experiments, Cassini's Cosmic Dust Analyzer (CDA) scoops up and analyzes small ring particles to help determine the age of Saturn's rings. Interplanetary meteoroids bombard Saturn's main rings, depositing silicates, organics, and metals in the ring particles. The more of those contaminants the CDA finds, the older Saturn's rings probably are.
• The CIRS instrument also observes Saturn's A ring to compare properties of ice in the rings and on Saturn's icy moons.
• During this orbit, Cassini gets within 2,110 miles (3,390 kilometers) of Saturn's 1-bar level. Cassini also passes within 2,680 miles (4,320 kilometers) of the inner edge of Saturn's D ring.
  

[tnt22]

CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 2 ч. назад

This diagram shows all our orbits at Saturn: https://go.nasa.gov/2rSuSEo



2 ч. назад

Saturn's rings were named alphabetically in the order they were discovered: https://go.nasa.gov/2rSG049

[tnt22]

CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 1 ч. назад

Gap cleared. The 10th ring crossing of the #GrandFinale mission is complete, as simulated here in @NASA_Eyes. More: https://go.nasa.gov/2s06rFf

[Виктор Левашов]

ОАЯ пишет:
Кабы я был морем вокруг Сатурна, я бы собрался в большую каплю, в конце концов, наподобие Луны.

Так может и соберутся лет через миллиард, или пять.
А пока ведь Энцелад парит, в смысле гейзеры пара выпускает, всю малину слияний путает.

[tnt22]

https://saturn.jpl.nasa.gov/mission/grand-finale/grand-finale-orbit-guide/#Orbit_11

IN PROGRESS: Orbit 281 - June 26 - July 3

[TH]Event[/TH][TH]Date[/TH][TH]Spacecraft Time (UTC)[/TH][TH]Local Time (PDT)[/TH][TH]Notes[/TH]

Apoapse	Jun 26	4:35 p.m.	9:35 a.m.
Ring Crossing #11	Jun 29	10:10 p.m.	3:10 p.m.	Cassini again ventures into the D ring. Spacecraft will be shielded by its High Gain Antenna.
Downlink	Jun 30	9:55 a.m.	2:55 a.m.	Estimated Earth Received Time (ERT) is 4:10 a.m. PDT on June 30.

[/li]
• During this orbit, Cassini's Ultraviolet Imaging Spectrograph (UVIS) observes the edge of Saturn's atmosphere, studying airglow, auroras and hydrocarbons — scientists need more information about Saturn's hydrocarbon distribution to improve models of how sunlight affects the chemistry of the planet's upper atmosphere.
• The spacecraft's Composite Infrared Spectrometer (CIRS) maps the temperature and composition of Saturn's north polar vortex at the highest resolution of the mission so far.
• Cassini's Visible and Infrared Mapping Spectrometer (VIMS) captures a movie of Saturn's south polar region. It is the closest and sharpest near-infrared movie to date of the intricate structure and complex movements of features in and around the south polar vortex.
• During this orbit's ring-plane crossing, the spacecraft is oriented such that its high-gain antenna (the big dish) faces forward (called HGA to RAM) to help shield the spacecraft from ring particles.
• After ring-plane crossing, Cassini completes an engineering checkout of the spacecraft's sun sensor assembly to be sure it wasn't damaged when the high-gain antenna shielded the spacecraft during ring-plane crossing.
• During this orbit, Cassini gets within 2,320 miles (3,720 kilometers) of Saturn's 1-bar level. Cassini also passes within 2,480 miles (3,980 kilometers) of the inner edge of Saturn's D ring.
  

[tnt22]

CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 5 ч. назад

A sliver of #Saturn's sunlit atmosphere, with the icy rings stretching across the foreground as a dark band https://go.nasa.gov/2sTwIHe 

https://saturn.jpl.nasa.gov/resources/7692/

Saturnian Dawn

Спойлер

Photojournal: PIA21334

[свернуть]

June 26, 2017

NASA's Cassini spacecraft peers toward a sliver of Saturn's sunlit atmosphere while the icy rings stretch across the foreground as a dark band.

Спойлер

This view looks toward the unilluminated side of the rings from about 7 degrees below the ring plane. The image was taken in green light with the Cassini spacecraft wide-angle camera on March 31, 2017.

The view was obtained at a distance of approximately 620,000 miles (1 million kilometers) from Saturn. Image scale is 38 miles (61 kilometers) per pixel.

The Cassini mission is a cooperative project of NASA, ESA (the European Space Agency) and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.

For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov and http://www.nasa.gov/cassini. The Cassini imaging team homepage is at http://ciclops.org.

Credit

NASA/JPL-Caltech/Space Science Institute

ENLARGE

Downloads
 
Hi-res Image
338 KB
image/tiff

Download

[свернуть]

[tnt22]

CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 1 ч. назад

The spacecraft acquired this raw, unprocessed image on June 7. More raw images: https://go.nasa.gov/2guHnlH