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No Signal Yet From Philae (But ESA Isn’t Giving Up)

Philae's view from its current location on comet 67P/C-G. ( ESA/Rosetta/Philae/CIVA)

Philae’s view from its current location on comet 67P/C-G, captured by one of its three CIVA cameras. (ESA/Rosetta/Philae/CIVA)

The first attempt by ESA and Rosetta to hear back from Philae has turned up only radio silence – but that doesn’t necessarily mean the lander is on permanent shutdown. It may just be that it’s still too cold and dark where Philae is to have sufficiently warmed up its components for reactivation.

“It was a very early attempt; we will repeat this process until we receive a response from Philae,” said DLR (Germany’s Aerospace agency) Project Manager Stephan Ulamec. “We have to be patient.”

After landing in an as yet unconfirmed location on comet 67P on November 12, 2014, Philae performed all of its primary science tasks before running out of battery power and entering a hibernation “safe” mode. Its reawakening is anticipated by mission engineers as the comet gets closer to the Sun over the next several months.

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The Next Chapter of Philae’s Big Adventure is Here!

A great job by the Philae lander! (ESA/Rosetta)

A great job by the Philae lander! (ESA/Rosetta)

If you’ve been following the animated adventures of Rosetta and Philae from the European Space Agency you may have been wondering when the next episode of Philae’s big adventure would be coming. Well it’s here, and you can find out (again) what happened to the little lander on November 12, 2014 when it made its historic touchdown(s) on comet 67P/C-G.

Currently the exact location of Philae is still unknown, but mission scientists are working on finding out where it is and have hopes of hearing from the lander again as it warms up in coming months.

Watch the previous episode of “Landing on a Comet” here, and see the video above in other languages on ESA’s YouTube page here.

Video: ESA

When a Comet Met Ganymede

Galileo image of a crater chain on Jupiter's moon Ganymede (NASA/JPL)

Galileo image of a crater chain on Jupiter’s moon Ganymede (NASA/JPL)

Captured by NASA’s Galileo spacecraft on April 5, 1997, this image shows Enki Catena, a 161.3-km (100-mile) long crater chain on the surface of Jupiter’s moon Ganymede. Named after the Sumerian god of fresh water, Enki Catena is thought to have been formed when a comet approached too close to Jupiter and was torn into 13 pieces, each impacting Ganymede in rapid succession… sort of a miniature version of what occurred in 1994 with comet Shoemaker-Levy 9.

Ganymede is not only Jupiter’s largest moon but also the largest moon in the Solar System. At 5,268 km (3,273 miles) across it is larger than Pluto and Mercury, and is the only moon that generates its own magnetosphere.

Launched in October 1989, Galileo arrived at Jupiter in December 1995 and orbited the giant planet 34 times before ending its mission with a dive into Jupiter’s atmosphere on September 21, 2003. Learn more about Galileo mission highlights here.

Source: CICLOPS

Rosetta Shadows Its Comet… Yes, Literally

Close view of a 228 x 228 meter region on Comet 67P/C-G. Rosetta's shadow can be seen at the bottom. (ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA)

OSIRIS image of a 228 x 228 meter region on Comet 67P/C-G. Rosetta’s shadow can be seen at the bottom. 

See the image above? It’s the surface of a comet. Pretty cool. See the dark spot along the bottom? It’s the shadow of the spacecraft that took the image of the comet.

WAY cool!

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Rosetta Gets Up Close and Personal With Comet 67P

The surface of 67P/C-G imaged by Rosetta on Feb. 14, 2015 from about 8.9 km (Credits: ESA/Rosetta/NavCam – CC BY-SA IGO 3.0)

The surface of 67P/C-G imaged by Rosetta on Feb. 14, 2015 from about 8.9 km (Credits: ESA/Rosetta/NavCam – CC BY-SA IGO 3.0)

On Saturday, Feb. 14, 2015, the Rosetta spacecraft performed a bit of a barnstorming act, swooping low over the surface of comet 67P/C-G in the first dedicated close pass of its mission. It came within a scant 6 km (3.7 miles) of the comet’s surface at 12:41 GMT. The image above is a mosaic of four individual NavCam images acquired just shortly afterwards, when Rosetta was about 8.9 km from the comet.

Higher-resolution OSIRIS images should be downlinked from the spacecraft within the next few days.

The view above looks across much of the Imhotep region along the flat bottom of comet 67P’s larger lobe. (See a map of 67P’s named regions here.) At the top is the flat “plain” where the Cheops boulder cluster can be seen – the largest of which, Cheops itself, is 45 meters (148 feet) across.

After the close pass Rosetta headed out to a distance of about 253 km (157 miles) before beginning preparations to approach closer again. Over the course of Rosetta’s mission this year flybys will be the “new normal,” but none will be as close as the Feb. 14 pass.

Watch a video from ESA about the close pass below, and find more images from the flyby in my article on Universe Today here.

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Been Waiting for Hi-Res OSIRIS Images of Rosetta’s Comet? Here They Are!

The boulder-strewn, smooth Hapi region in Comet 67P/Churyumov-Gerasimenko’s neck, with the Hathor cliff face to the right. Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

The boulder-strewn, smooth Hapi region in Comet 67P/Churyumov-Gerasimenko’s neck, with the Hathor cliff face to the right. Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

Many of the images we have been seeing of Rosetta’s comet – 67P/Churyumov-Gerasimenko, or 67P for short – have been captured with the spacecraft’s NavCam instrument. And while they have been amazingly beautiful in their own right, NavCam isn’t Rosetta’s best camera; that distinction goes to OSIRIS, the Optical, Spectroscopic, and Infrared Remote Imaging System experiment that captures both wide- and narrow-angle high resolution images for scientific study.

Now OSIRIS images of 67P have been few and far between since Rosetta arrived, mostly because the instrument is not run by ESA but rather by the Max Planck Institute for Solar System Research in Germany and a rather large international consortium of research groups, and they have first access to the data and decide when images will become publicly available. While it’s very common in space science to allow time for researchers to work privately with their own data for a period of time before it gets spread around, it can be frustrating for those who know there are fantastic images waiting to be seen (of, say, the surface of a comet) that are just out of reach!

So today the OSIRIS team threw us all a few bones, images that show the surface of 67P in stunning detail that the hardworking but lower-resolution NavCam could never deliver. Above is one, and there are even more below – check ‘em out!

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