Category Archives: Space Science

Video: Planetary Post with Robert Picardo – “It Came From Planet 9”

The latest Planetary Post with Robert Picardo, sponsored by the Planetary Society, is now available: It Came From Planet 9 

Picardo is the Phantom of the Orbit in this spooky episode of The Planetary Post for Halloween. Enjoy a special guest visit from Dr. Konstantin Batygin, one of the members of the team which has theorized a big, ninth planet way out beyond Neptune.

 

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More views of Saturn’s rings from the Cassini Finale

A wonderful view of Saturn as seen by Cassini about a month before the probe’s mission ended by entering the planet’s atmosphere:

The Grace of Saturn

Saturn’s graceful lanes of orbiting ice — its iconic rings — wind their way around the planet to pass beyond the horizon in this view from NASA’s Cassini spacecraft.  And diminutive Pandora, scarcely larger than a pixel here, can be seen orbiting just beyond the F ring in this image.

Also in this image is the gap between Saturn’s cloud tops and its innermost D ring through which Cassini would pass 22 times before ending its mission in spectacular fashion in Sept. 15, 2017.  Scientists scoured images of this region, particularly those taken at the high phase (spacecraft-ring-Sun) angles, looking for material that might pose a hazard to the spacecraft.

This view looks toward the sunlit side of the rings from about 19 degrees above the ringplane. The image was taken in green light with the Cassini spacecraft wide-angle camera on Aug. 12, 2017. Pandora was brightened by a factor of 2 to increase its visibility.

The view was obtained at a distance to Saturn of approximately 581,000 miles (935,000 kilometers) from Saturn. Image scale is 35 miles (56 kilometers) per pixel. The distance to Pandora was 691,000 miles (1.1 million kilometers) for a scale of 41 miles (66 kilometers) per pixel.

The Cassini spacecraft ended its mission on Sept. 15, 2017.

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 https://saturn.jpl.nasa.gov and https://www.nasa.gov/cassini. The Cassini imaging team homepage is at http://ciclops.org.

Credit: NASA/JPL-Caltech/Space Science Institute

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See also Cassini: The Grand Finale: Fresh Findings From Cassini – NASA JPL

Cassini obtained the images in this mosaic on May 28, 2017, looking over the horizon just after its sixth pass through the gap between Saturn and its rings as part of the mission’s Grand Finale.

In this view, Saturn looms in the foreground on the left, adorned by ring shadows.  To the right, the rings emerge from behind the planet’s hazy limb, stretching outward from Cassini’s perspective. The view is of the rings’ unilluminated face, where sunlight filters through from the other side. The part of the planet seen here is in the southern hemisphere.

A wider, uncropped version of the mosaic (Fig. B), which shows more of the rings, is also available.

For another mosaic showing the view from between Saturn and the rings, see  Inside-Out Rings: View From Beneath. A previously released movie sequence showed Cassini’s changing view, gazing out upon the rings as the spacecraft passed through the ring plane from north to south (see Cassini’s ‘Inside-Out’ Rings Movie).

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Astronomers discover ring around faraway dwarf planet Haumea

A collaboration of astronomers and observatories have discovered that the dwarf planet Haumea, which orbits out beyond Neptune, has  a ring around it: Oddball dwarf planet Haumea has a ring | Science News

On January 21, [Jose-Luis Ortiz of the Institute of Astrophysics of Andalusia in Granada, Spain] and colleagues used 12 telescopes at 10 observatories to peer into the Kuiper Belt, a region of icy objects beyond the orbit of Neptune, and watch Haumea block the light of a distant star. That tiny eclipse let the team measure the dwarf planet’s size, shape and surrounding environment more accurately than ever before.

Haumea turned out to be larger — its long axis stretches at least 2,322 kilometers, a bit more than half the width of the contiguous United States — and less dense than previously thought, the team reports October 11 in Nature. To their surprise, the researchers also saw the background star flicker before and after its light was blocked by Haumea itself. That flicker is consistent with a 70-kilometer-wide ring about 1,000 kilometers above the dwarf planet’s surface.

The ring presumably consists of rocks and ice like planetary rings elsewhere: Planetary Society-funded telescopes help find ring around Haumea, a distant dwarf planet | The Planetary Society

We know giant planets like Jupiter, Saturn, Uranus and Neptune have rings, but thus far, we’ve only found them around two small worlds. Chariklo is about 250 kilometers wide, and has two rings, while Chiron, about the same size, is also suspected to have a ring. Both Chariklo and Chiron are Centaurs, small worlds orbiting the Sun between the asteroid belt and Kuiper belt, crisscrossing the giant planets’ orbits. 

With today’s announcement, Haumea becomes the first, small, non-Centaur known to have a ring, and the farthest ring world we’ve found in our solar system. 

An artist’s rendering of how the ring around Haumea might look.

Lockheed seeing payoff from investments in commercial space technology – SpaceNews.com

 

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Video: Spacecraft Bonanza! – The Planetary Post with Robert Picardo

Here is the Planetary Society‘s latest Planetary Post video with Robert Picardo:

From the caption:

William Shatner sends a message to Voyager 1, Cassini crashes into Saturn, asteroid-seeking OSIRIS-REx gets a gravity assist, and The Planetary Society’s citizen-funded solar sailing spacecraft LightSail® 2 is making news again. Robert Picardo is here to tell you all about it in this month’s Planetary Post. Get space updates delivered straight to your inbox: http://planet.ly/TI0Pf

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Here is the full video  mentioned by Picardo that shows an animation of the LightSail 2 spacecraft development and launch.

 

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