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Archive for September, 2017

September 21, 2017

High Above Saturn

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NASA dixit:

“October 10, 2013. This portrait looking down on Saturn and its rings was created from images obtained by NASA’s Cassini spacecraft. It was made by amateur image processor and Cassini fan Gordan Ugarkovic. This image has not been geometrically corrected for shifts in the spacecraft perspective and still has some camera artifacts. The mosaic was created from 12 image footprints with red, blue and green filters from Cassini’s imaging science subsystem. Ugarkovic used full color sets for 11 of the footprints and red and blue images for one footprint.”

Image credit: NASA/JPL-Caltech/Space Science Institute/G. Ugarkovic

 

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September 21, 2017

Cassini’s Last Looks at Saturn

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Wikipedia dixit:

“The Cassini–Huygens (commonly called Cassini) mission was a collaboration between NASA, the European Space Agency (ESA), and the Italian Space Agency (ASI) to send a probe to study the planet Saturn and its system, including its rings and natural satellites. The Flagship-class unmanned robotic spacecraft comprised both NASA’s Cassini probe, and ESA’s Huygens lander which would be landed on Saturn’s largest moon, Titan. Cassini was the fourth space probe to visit Saturn and the first to enter its orbit. The craft were named after astronomers Giovanni Cassini and Christiaan Huygens.

Launched aboard a Titan IVB/Centaur on October 15, 1997, Cassini was active in space for more than 19 years, with 13 years spent orbiting Saturn, studying the planet and its system after entering orbit on July 1, 2004. The voyage to Saturn included flybys of Venus (April 1998 and July 1999), Earth (August 1999), the asteroid 2685 Masursky, and Jupiter (December 2000). Its mission ended on September 15, 2017, when Cassini was commanded to fly into Saturn’s upper atmosphere and burn up in order to prevent any risk of contaminating Saturn’s moons, which may offer habitable environments to stowaway terrestrial microbes on the spacecraft. (At that point Cassini lacked sufficient impulse to leave the Saturn system, so it could only be left in orbit, where it might collide with a moon, or be destroyed.) The mission is widely perceived to have been successful beyond expectation. Cassini-Huygens has been described by NASA’s Planetary Science Division Director as a “mission of firsts”, that has revolutionized human understanding of the Saturn system, including its moons and rings, and our understanding of where life might be found in the Solar System.

Cassini’s original mission was planned to last for four years, from June 2004 to May 2008. The mission was extended for another two years until September 2010, branded the Cassini Equinox Mission. The mission was extended a second and final time with the Cassini Solstice Mission, lasting another seven years until September 15, 2017, on which date Cassini was de-orbited to burn up in Saturn’s upper atmosphere.

The Huygens module traveled with Cassini until its separation from the probe on December 25, 2004; it was successfully landed by parachute on Titan on January 14, 2005. It successfully returned data to Earth for around 90 minutes, using the orbiter as a relay. This was the first landing ever accomplished in the outer Solar System and the first landing on a moon other than our own. Cassini continued to study the Saturn system in the following years.

At the end of its mission, the Cassini spacecraft executed the “Grand Finale” of its mission: a number of risky passes through the gaps between Saturn and Saturn’s inner rings. The purpose of this phase was to maximize Cassini’s scientific outcome before the spacecraft was destroyed. The atmospheric entry of Cassini effectively ended the mission.”

Video credit: NASA

 

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September 20, 2017

Prometheus’ Handiwork

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NASA dixit:

“August 24, 2013. Saturn’s moon Prometheus orbits near some of its handiwork in the F ring. Prometheus (53 miles, or 86 kilometers across) and its partner Pandora gravitationally sculpt and maintain the narrow F ring.

This view looks toward the unilluminated side of the rings from about 53 degrees below the ringplane. The image was taken in visible light with the Cassini spacecraft narrow-angle camera. The view was acquired at a distance of approximately 1.1 million miles (1.8 million kilometers) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 104 degrees. Image scale is 7 miles (11 kilometers) per pixel.”

Image credit: NASA

 

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September 20, 2017

Goodbye Cassini

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Wikipedia dixit:

“The Cassini–Huygens (commonly called Cassini) mission was a collaboration between NASA, the European Space Agency (ESA), and the Italian Space Agency (ASI) to send a probe to study the planet Saturn and its system, including its rings and natural satellites. The Flagship-class unmanned robotic spacecraft comprised both NASA’s Cassini probe, and ESA’s Huygens lander which would be landed on Saturn’s largest moon, Titan. Cassini was the fourth space probe to visit Saturn and the first to enter its orbit. The craft were named after astronomers Giovanni Cassini and Christiaan Huygens.

Launched aboard a Titan IVB/Centaur on October 15, 1997, Cassini was active in space for more than 19 years, with 13 years spent orbiting Saturn, studying the planet and its system after entering orbit on July 1, 2004. The voyage to Saturn included flybys of Venus (April 1998 and July 1999), Earth (August 1999), the asteroid 2685 Masursky, and Jupiter (December 2000). Its mission ended on September 15, 2017, when Cassini was commanded to fly into Saturn’s upper atmosphere and burn up in order to prevent any risk of contaminating Saturn’s moons, which may offer habitable environments to stowaway terrestrial microbes on the spacecraft. (At that point Cassini lacked sufficient impulse to leave the Saturn system, so it could only be left in orbit, where it might collide with a moon, or be destroyed.) The mission is widely perceived to have been successful beyond expectation. Cassini-Huygens has been described by NASA’s Planetary Science Division Director as a “mission of firsts”, that has revolutionized human understanding of the Saturn system, including its moons and rings, and our understanding of where life might be found in the Solar System.

Cassini’s original mission was planned to last for four years, from June 2004 to May 2008. The mission was extended for another two years until September 2010, branded the Cassini Equinox Mission. The mission was extended a second and final time with the Cassini Solstice Mission, lasting another seven years until September 15, 2017, on which date Cassini was de-orbited to burn up in Saturn’s upper atmosphere.

The Huygens module traveled with Cassini until its separation from the probe on December 25, 2004; it was successfully landed by parachute on Titan on January 14, 2005. It successfully returned data to Earth for around 90 minutes, using the orbiter as a relay. This was the first landing ever accomplished in the outer Solar System and the first landing on a moon other than our own. Cassini continued to study the Saturn system in the following years.

At the end of its mission, the Cassini spacecraft executed the “Grand Finale” of its mission: a number of risky passes through the gaps between Saturn and Saturn’s inner rings. The purpose of this phase was to maximize Cassini’s scientific outcome before the spacecraft was destroyed. The atmospheric entry of Cassini effectively ended the mission.”

Video credit: NASA

 

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September 19, 2017

Marvelous Mini-Jet

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NASA dixit:

“June 20, 2013. A beautiful ‘mini-jet’ appears in the dynamic F ring of Saturn. Saturn’s A ring (including the Keeler gap and just a hint of the Encke gap at the upper-right) also appears. The mini-jets are thought by imaging scientists to be caused by low-speed collisions in the F ring ejecting dusty material from the ring’s core.

This view looks toward the unilluminated side of the rings from about 48 degrees below the ringplane. The image was taken in visible light with the Cassini spacecraft narrow-angle camera. The view was obtained at a distance of approximately 841,000 miles (1.4 million kilometers) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 82 degrees. Image scale is 5 miles (8 kilometers) per pixel.”

Image credit: NASA

 

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September 19, 2017

Dragon Departs Space Station

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NASA dixit:

“The SpaceX/Dragon cargo craft departed the International Space Station September 17, one month after delivering more than three tons of supplies and scientific experiments for the station’s residents. Expedition 53 Flight Engineer Paolo Nespoli of the European Space Agency and station Commander Randy Bresnik used the Canadarm2 robotic arm to release Dragon after it was detached from the Earth-facing port of the Harmony module. Dragon was scheduled to move to a safe distance away from the station for its engine to conduct a deorbit burn, enabling it to drop out of orbit for a parachute-assisted splashdown in the Pacific southwest of Long Beach, California. Dragon was launched on a SpaceX Falcon 9 rocket from the Kennedy Space Center on August 14, arriving at the orbital outpost August 16.”

Video credit: NASA

 

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