A Five Minute Eclipse

This image shows the Dec. 20, 2012 total lunar eclipse, as seen from Sagamihara, Japan. Image Credit: NASA/MSFC/Alphonse Sterling

 

Europe was recently treated to a beautiful solar eclipse. Now there is a Total Lunar Eclipse coming to North America, South America, Middle Asia, including India, western China and mid-Asian Russia on 04 April.

Viewers in areas able to see the eclipse will have to look quick, the total eclipse will last only FIVE minutes! No fooling, this will be the shortest lunar eclipse this century. :mrgreen:

Fortunately people in eastern North America and western South America will get to see the early stages (partial umbral phase) of the eclipse in the western sky and people in Middle Asia, including India, western China and mid-Asian Russia will see the late stages low in the eastern sky just after sunset on 04 April.

Sorry Europe, Greenland, Iceland, Africa and the Middle East the eclipse will not be visible for you.

This is the third of a series of four eclipses in a row also known as a “tetrad”  The last two occurred in April and September 2014 and the last of the series will occur on 28 September 2015.

See a visibility map here.

The image at the top of the post shows the 20 December 2012 total lunar eclipse, as seen from Sagamihara, Japan.

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Wakonda Crater

A look at the crater Wakonda.  Click. Image Credit: NASA/JPL-Caltech/Space Science Institute
A look at the crater Wakonda. Click. Image Credit: NASA/JPL-Caltech/Space Science Institute

The Cassini spacecraft made a close flyby of Rhea on 9 February 2015 and returned one of the highest resolution color views of the Saturn moon Rhea so far.

From NASA:
Images taken using clear, green, infrared and ultraviolet spectral filters were combined to create these enhanced color views, which offer an expanded range of the colors visible to human eyes in order to highlight subtle color differences across Rhea’s surface. The moon’s surface is fairly uniform in natural color.

The largest crater in the view above is 123 km / 76 miles in diameter and is named Wakonda.

The names of surface features follow a naming convention adopted by the International Astronomical Union. In the case of craters on Rhea names are from People and places from creation myths. In this case Wakonda is a term used by Native Americans of the Omaha people when praying, and also applied by them to objects or phenomena regarded as sacred or mysterious.

The image was produced by Heike Rosenberg and Tilmann Denk at Freie Universität in Berlin, Germany.

Want the large versions? You can find them here.

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Oppy at Athens

Opportunity cChecking out Athens on 25 March 2015. Image Credit: NASA/JPL-Caltech
Opportunity checking out Athens on 25 March 2015. Image Credit: NASA/JPL-Caltech

Seen here with its robotic arm extended studying a rock called “Athens”, the Mars Exploration Rover Opportunity is still actively involved in science even after 3,970 days on Mars!

A couple of weeks before checking out “Athens” the rover took four images with the Pancam of the area called Marathon Valley located on the western rim of Endeavour Crater from its vantage point overlooking the valley.

opportunityvista

The scene spans from east to southeast and the image was taken on 13 March 2015.  The view is very close to the true color.

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Launch Day

A security helocopter surveys the area aound the launch pad for the Soyuz TMA-16M spacecraft before its arrival.  Photo Credit (NASA/Bill Ingalls)
A security helocopter surveys the area aound the launch pad for the Soyuz TMA-16M spacecraft before its arrival. Photo Credit (NASA/Bill Ingalls)

Mission: One Year in Space

Spacecraft: Soyuz TMA-16M

Crew: NASA astronaut Scott Kelly, Russian cosmonauts Mikhail Kornienko and Gennady Padalka

Launch Day / Time: 27 March 2015 at 19:42 UTC / 15:42 EDT

Launch site: Baikonur Cosmodrome, Kazakhstan

Note: Crew members Kelly and Kornienko will be aboard the ISS until March 2016. The long duration is to study how the body reacts and adapts to life in space. The research is needed for future missions say to Mars and may have implications for helping patients here on Earth recovering from long terms of bed rest to helping those with poor immune systems.

Scott Kelly has a twin brother, retired NASA astronaut Mark Kelly who will participate in a number of comparative genetic studies.

From NASA:
There are seven key elements of research on the one-year mission. Functional studies will examine crew member performance during and after the 12-month span. Behavioral studies will monitor sleep patterns and exercise routines. Visual impairment will be studied by measuring changes in pressure inside the human skull. Metabolic investigations will examine the immune system and effects of stress. Physical performance will be monitored through exercise examinations. Researchers will also monitor microbial changes in the crew, as well as the human factors associated with how the crew interacts aboard the station.

NASA-TV coverage is scheduled to begin at 18:30 UTC / 14:30 EDT

Launch Replay

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Jupiter’s Aurora

Credit: JAXA
Credit: JAXA

Last week we had a beautiful display of the aurora courtesy of a solar storm. Other planets are known to have auroral activity. Jupiter included, however the giant planet has auroral activity that isn’t always due to solar storms

The Japan Aerospace Exploration Agency (JAXA) using their Hisaki satellite detected flare-ups get started by the interaction with the Jupiter moon Io and the planet. The results of two months observing Jupiter with Hisaki were published in a paper by Tomoki Kimura of JAXA and his colleagues in Geophysical Research Letters, a journal of the American Geophysical Union.

More at EXPLOSIONS OF JUPITER’S AURORA LINKED TO EXTRAORDINARY PLANET-MOON INTERACTION press release of the AGU.

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Waiting for Philae

Comet 67P/Churyumov-Gerasimenko. Credits ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0
Comet 67P/Churyumov-Gerasimenko. Credits ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0

A Rosetta NAVCAM image of Comet 67P/Churyumov-Gerasimenko from 81.4 km / 50.6 miles. ESA did a nice job of processing the image in order to bring out some of the outflow. The outflow should become more evident over time and give 67P/G-C the classic comet look.

In the mean time Rosetta is intermittently sending radio signals to the Philae lander to establish contact. So far nothing has been heard from the little lander. Possibly the solar panels have not built up enough power in the systems to function or maybe it is just too cold. The lander remains in hibernation.

Philae needs an internal temperature above -45 C / -49 F and five watts of power to turn on – which is pretty impressive. The lander needs to be able to generate 19 watts in order to send signals to Rosetta.

ESA is choosing when to send signals to Philae so the alignment between it and Rosetta and presumably the sun to have the best chance for success. The first half of April will be the next best opportunity to contact.

If you click the image above you will see a version with some of the craters labeled.

Have a look at Rosetta Blog “Waiting patently for Philae” for more detail.

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Radio Saturn

Saturn seen in radio waves. Image: I. de Pater, J.R. Dickel; NRAO/AUI/NSF
Saturn seen in radio waves. Image: I. de Pater, J.R. Dickel; NRAO/AUI/NSF

This is what Saturn looks like to the Very Large Array or VLA. The VLA “sees” in a part of the spectrum we can’t see – the radio spectrum.

Here’s the NRAO description of the image:

Note the bright disk of the planet with a gradual fading toward the edge, called limb darkening. This illustrates a gradual cooling outward in Saturn’s atmosphere. The rings are seen in emission outside the disk but then in front of the planet they absorb the radiation from the bright disk behind, appearing as a dark band. In visual light they appear bright everywhere because they reflect the incident sunlight but at radio wavelengths the sunlight is fainter and we see the actual emission from Saturn.

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Mercury’s North Pole

Temperature map of Mercury's north polar region. Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Temperature map of Mercury’s north polar region. Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

Here’s an orthographic look at the north polar region from the Messenger spacecraft. The view is colored by the maximum biannual surface temperature. The temperature ranges from over 400 K / 127 C / 260 F for the red colors down to 50 K / -223 C /-370 F for the purple colors. Temperatures on Mercury do exceed 350 C / 660 F in places.

The largest crater shown is called Prokofiev and it is centered at 85.77 degrees latitude. The interior of the purple colored craters are easily cold enough for water ice to be stable – hard to imagine but true.

There is big news coming in the Messenger mission. The spacecraft is orbiting closer and closer to the surface of the planet being boosted by thrusters when necessary. One orbit brought Messenger to within 11.6 km / 7.2 miles of the surface of Mercury. The Thrusters increased the speed of the spacecraft by 3.07 meters per second or 6.87 miles per hour and increased the minimum close-approach altitude of 34 km / 21.4 miles.

The problem is the propellant is about gone and this means the Messenger spacecraft will end its mission by crashing into the surface of Mercury. There is another thruster maneuver on 02 April, this will probably be the last such event. Messenger is expected to impact the surface of Mercury later in April, May at the latest.

Europe will visit the inner-most planet with the launch of BepiColumbo in 2016 and a trip of 7 years.

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