Crescent Earth as Seen by Comet Chasing Spacecraft

Title this one “Rich Blue Crescent” (as opposed to Pale Blue Dot.) This spectacular image of our home planet was captured by the OSIRIS instrument on ESA’s Rosetta comet chaser today (November 12) at 12:28 GMT from about 633,000 km as the spacecraft approached Earth for the third and final swingby. Closest approach is due at 07:45 GMT, on November 13. You can follow Rosetta’s progress at ESA’s Rosetta site and the Rosetta Blog.

Rosetta to Make Final Earth Flyby Nov. 13th

The comet chasing spacecraft Rosetta will make its third and final swing by the Earth on November 13th to pick up more speed for the last part of a 10-year journey that lies ahead. Its mission is to place a lander on comet 67P/Churyumov-Gerasimenko and chase the comet for an entire year on its orbit around the Sun. The spacecraft will be visible to observers from the ground in certain locations on the Earth. This last flyby will increase the spacecraft’s speed by 3.6 km/s (2.2 miles/s) with respect to the Sun, giving Rosetta the energy it needs to boost it to the outer regions of the Solar System.

Rosetta was launched March 2nd, 2004, and will visit a host of targets on its way to comet 67P/Churyumov-Gerasimenko. Rosetta already paid a visit to asteroid 2867 Steins in September 2008. It will visit comet 21 Lutetia 10 June 2010, after which it will go into hibernation until it reaches its final destination in May 2014.

Once Rosetta arrives at 67P/Churyumov-Gerasimenko, it will deploy its Philae lander on the comet’s nucleus, and continue to orbit and study the comet for an entire year during its closest orbit of the Sun. This is the first mission ever to orbit and land on a comet, and promises to return a wealth of data on cometary interaction with the Sun. Comets also contain mostly undisturbed materials from the formation of the Solar System in their nuclei, so studying their composition gives scientists an look into how our Solar System developed.

During the flyby of Earth in November of 2007, Rosetta took the breathtaking image of the Earth pictured here. This next flyby will give observers on the ground a chance to take a look back at Rosetta. The closest approach will occur on November 13th at 8:45 Central European Time (07:45 UT).

Unfortunately, the spacecraft will only be visible from parts of Europe, South America and Africa, as can be seen in the image below. If you are in these regions during the approach, and have favorable conditions, there is a wealth of observing information on the Rosetta blog, specifically on the posts Tips for Sky Junkies I and Tips for Sky Junkies II. They will also be closely following the flyby on the blog, so you can check there for updates on the eve of the event if you are outside the observable range of the spacecraft.The regions where Rosetta will be visible to observers from the ground. Image Credit: ESA

As always, you can check back with us on Universe Today for more coverage of Rosetta’s journey!

Source: ESA

MESSENGER and other Significant Mission Events in 2008


Today, the MESSENGER spacecraft will perform a significant task in its mission by making its first flyby of Mercury (see more info below). Additionally, other spacecraft that are out doing their jobs in various locations of our solar system will have significant mission events occur in 2008. Let’s take a look at the big events coming up this year.

January 14: MESSENGER Flyby of Mercury

Messenger, the MEercury Surface Space ENvironment GEochemistry and Ranging spacecraft, will be the first spacecraft to visit Mercury in almost 33 years. It will explore and take close-up images of parts of the planet that we’ve never seen before. This is the first of three flybys of Mercury the spacecraft will take before settling into orbit in 2011. MESSENGER’s cameras and other instruments will collect more than 1,200 images and make other observations during this approach, encounter and departure. The closest approach of the flyby will occur at 19:04:42 UTC (2:04:42 EST), but mission managers said pictures from the event may not be released for up to a week.

March 12: Cassini flies through the plume of Enceladus’ geyser

The Cassini spacecraft will fly extremely close to Saturn’s moon Enceladus at an altitude of only 23 km (14 mi), and actually fly through the plume of an active geyser on the moon’s south pole. How such a cold moon could host an area warm enough to have erupting water vapor is a mystery. Scientists are pondering if Enceladus has active ice volcanism, and if so, is it due to ice sublimating, like a comet, or due to a different mechanism, like boiling water as in Old Faithful at Yellowstone. This flyby will help answer those questions.

Cassini will also have several relatively close flybys this year of the moon Titan. The flybys will occur on Feb. 22, March 25, and May 12.

May 25: Phoenix lands on Mars

Phoenix will land in the north polar region of Mars and will help characterize the climate and geology of the Red Planet, as well as possibly determine if live ever arose on Mars. Pursuing NASA’s “Follow the Water” strategy, the lander will dig through soil to reach water ice with its robotic arm and perform numerous scientific experiments. Phoenix launched on Aug. 4, 2007. University of Arizona’s Phoenix page

September 5: Rosetta flyby of Asteroid Steins

The Rosetta spacecraft is on its way to orbit comet 67P Churyumov-Gerasimenko in 2014, but in the meantime it will pass by Asteroid 2867 Steins. During the flyby, Rosetta will study Steins to determine and characterize the asteroid’s surface composition and morphology. Asteroid Steins is roughly 10 km in diameter.