Year: 2017

Saturn’s magnificent rings

8:47 am

Saturn's rings

The Cassini science team released two sets of images taken by the spacecraft of Saturn’s rings.

The image above, reduced in resolution to show here, is from the second link. As they note,

The pale tan color is generally not perceptible with the naked eye in telescope views, especially given that Saturn has a similar hue.

The material responsible for bestowing this color on the rings—which are mostly water ice and would otherwise appear white—is a matter of intense debate among ring scientists that will hopefully be settled by new in-situ observations before the end of Cassini’s mission.

The different ringlets seen here are part of what is called the “irregular structure” of the B ring. Cassini radio occultations of the rings have shown that these features have extremely sharp boundaries on even smaller scales (radially, or along the direction outward from Saturn) than the camera can resolve here. Closer to Saturn, the irregular structures become fuzzier and more rounded, less opaque, and their color contrast diminishes.

Check out both. They reveal to me that our understanding of these rings remains essentially nil, even after more than a dozen years of study by Cassini.

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First Juno movie of Jupiter’s changing weather

8:34 am

Gerald Eichstädt at the Juno image site has produced the first attempt to assemble a movie of Juno images of the same area on Jupiter in order to show its changing weather.

JunoCam has been seeing this scene about six times from very different perspectives between about 2017-09-01T22:03 and about 2017-09-01T22:19, hence a over a little more than 15 minutes.

This animation is a first attempt to reproject the six images to a similar common perspective in order to reveal some dynamical information.

An movie covering only 15 minutes won’t show much change, but it is a start. He also notes that in making the different images match up he likely introduced some artifacts that are not real.

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Plan of New Horizons’ fly-by of 2014 MU69 announced

11:31 pm

The New Horizons science team has announced its detailed plan for the January 1, 2019 fly-by of Kuiper Belt object 2014 MU69.

If all goes as planned, New Horizons will come to within just 2,175 miles (3,500 kilometers) of MU69 at closest approach, peering down on it from celestial north. The alternate plan, to be employed in certain contingency situations such as the discovery of debris near MU69, would take New Horizons within 6,000 miles (10,000 kilometers) — still closer than the 7,800-mile (12,500-kilometer) flyby distance to Pluto.

…If the closer approach is executed, the highest-resolution camera on New Horizons, the telescopic Long Range Reconnaissance Imager (LORRI) should be able to spot details as small as 230 feet (70 meters) across, for example, compared to nearly 600 feet (183 meters) on Pluto.

MU69 is thought to either be two objects orbiting very close to each other or an object similar to Comet 67P/C-G, two objects in contact but barely so.

In a related New Horizons story, the International Astronautical Union (IAU) has officially accepted 14 names chosen by the New Horizons team for features on Pluto.

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Illegal votes may have decided 2016 New Hampshire results

3:45 pm

New data strongly suggests that illegal voters could have tipped the New Hampshire 2016 election in favor of the Democrats.

Over 6,000 voters in New Hampshire had used same-day voter registration procedures to register and vote simultaneously for president. The current New Hampshire Speaker of the House, Shawn Jasper, sought and obtained data about what happened to these 6,000 “new” New Hampshire voters who showed up on Election Day.

It seems the overwhelming majority of them can no longer be found in New Hampshire. Of those 6,000, only 1,014 have ever obtained New Hampshire driver’s licenses. Of the 5,526 voters who never obtained a New Hampshire driver’s license, a mere three percent have registered a vehicle in New Hampshire. The Public Interest Legal Foundation received information that 70 percent of the same-day registrants used out-of-state photo ID to vote in the 2016 presidential election in New Hampshire and to utilize same-day registration.

Gov. Maggie Hassan, a Democrat, also defeated incumbent U.S. Sen. Kelly Ayotte by only 1,017 votes.

The one bright sign here is that it appears that New Hampshire officials appear willing to address these issues, and make changes.

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Juno finds mystery in Jupiter’s aurora

1:34 pm

The uncertainty of science: Scientists analyzing the data sent back by Juno have found that the system for generating Jupiter’s aurora does not appear to be same as the process that creates auroras on Earth.

The science here is a bit complicated. Suffice it to say that Jupiter’s aurora seems produced by a much more complex process, which actually should not have surprised anyone, considering how much larger Jupiter is and more powerful its magnetic field.

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“Witches, Jews And Climate Deniers”

11:02 am

Link here. This is the introduction:

Throughout history, hate groups have looked for scapegoats to blame things on.

In the 16th century progressive hate groups blamed bad weather on witches, and burned tens of thousands of witches at the stake. In the 1930’s and 1940’s progressives put millions of Jews in gas chambers as scapegoats for Germany’s problems, and now progressive hate groups blame the weather on people who resist their climate scam. They want to criminalize and prosecute free speech and scientific inquiry.

It goes on from there, documenting the anger and hate and certainty of the pro-global warming crowd, and their increasing intolerance for any dissent, or any facts that counter their positions or certainty. Read it all. It is worth it.

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Mars rover update: September 6, 2017

9:56 am

Summary: Curiosity ascends up steepest part of Vera Rubin Ridge, getting just below the ridgetop, while Opportunity inspects its footprint in Perseverance Valley.

Curiosity

For the overall context of Curiosity’s travels, see Pinpointing Curiosity’s location in Gale Crater.

Curiosity panorama, Sol 1807

Curiosity's location, Sol 1802

Since my last update on August 11, Curiosity has been slowly working its way along the base of Vera Rubin Ridge, and up its slope. Today’s update from the science team describes how the rover is now on the steepest part of that slope, which is also just below the ridgetop. The panorama above looks east at the ridge, at the sand-duned foothills in the Murray Formation that Curiosity has been traversing since March 2016, and the crater plains beyond.

The image on the right shows Curiosity’s approximate position, with the point of view of the panorama indicated. The image also shows their planned upcoming route across the Hematite Unit. As they note in their update:

Curiosity now has great, unobstructed views across the lowlands of Gale crater to the rear of the rover. The view is improving as the air becomes clearer heading into the colder seasons. The first image link below shows a Navcam view into the distance past a cliff face just to the left of the rover. The image is tilted due to the to the unusually high 15.5 degree tilt of the rover as it climbs the ridge. Part of Mount Sharp is in the background. The second link shows an image looking ahead, where we see much more rock and less soil. The foreground shows that some of the pebbles are relatively well rounded. The rock face up ahead is smooth, which will mean easier driving.

That report I think is somewhat optimistic.
» Read more

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GAO report finds Navy training in Pacific inadequate

9:03 pm

A General Accountability Office report has found that more than a third of the Navy’s ships based in Japan do not have properly trained crews.

There are 70 to 80 ships and submarines in the 7th Fleet, which is on the front line of sea-based missile defense against North Korea. The GAO testimony focused on the destroyers and cruisers, the two kinds of ships involved in the four collisions this year. The Navy’s ships require more than a dozen training certifications, including mobility and seamanship and warfare capabilities like ballistic missile defense and surface warfare.

The cause of the McCain collision is still under investigation, but military leaders, lawmakers and the GAO have long warned about the Navy’s readiness crunch as the size of the fleet has increased and the number of ships deployed has remained constant, while the length of deployments has increased. “The Navy has had to shorten, eliminate, or defer training and maintenance periods to support these high deployment rates,” John Pendleton, director of the GAO defense capabilities and management, said in the written testimony.

But the GAO has also issued specific warnings about ships based abroad, and specifically Japan. In a May 2015 report, the GAO said that the Navy’s schedules for overseas ships limited dedicated training and maintenance time — and found that incidents of degraded or out-of-service equipment nearly doubled from 2009 to 2014.

There’s more, but essentially the Navy has been sending these ships out without properly trained crews.

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Arianespace pins down source of launch abort

6:51 pm

Arianespace has identified an issue in the electrical system in one of the Ariane 5’s solid rocket boosters as the source of the launch abort yesterday.

This is a preliminary report. They still need to find out exactly what happened and why. However, they also announced that their objective is to launch before the end of September. Moreover, they are not going to change the schedule of any of their other launches because of this.

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