Category Archives: Rosetta

The Orbits of Rosetta

ESA gives us this visualization of Rosetta’s journey. The video gives us a pretty good sense of the journey and how exacting the planning was and what it will be in the future, although the final bits of the journey were not completely finalized until after this visualization was made.

The trajectory shown in this animation is created from real data, but the comet rotation is not. An arrow indicates the direction to the Sun as the camera viewpoint changes during the animation. — ESA

I am always am amazed how ESA can make the very difficult look easy.

Video

Sleep Little Philae

The Philae lander on Comet 67P/Churyumov–Gerasimenko will likely be spending eternity in silence. “The chances for Philae to contact our team at our lander control centre are unfortunately getting close to zero,” says Stephan Ulamec, Philae project manager at the German Aerospace Center, DLR. “We are not sending commands any more and it would be very surprising if we were to receive a signal again.”

If things go as planned, Rosetta may be joining Philae when later this year when the spacecraft’s propellant runs low a landing attempt is made. This (hopefully) won’t be a large impacting event, rather a gentle touchdown and Rosetta will continue to collect and transmit data until the last. Might it even work from the surface for a short time? Probably not, but who knows.

Video

Exploring Imhotep

Exploring_Imhotep

Be sure to check out the “comet viewer tool” linked below.

ESA:

This beautiful landscape feels within arm’s reach in this stunning view across the Imhotep region on Comet 67P/Churyumov–Gerasimenko.

The view was captured by Rosetta’s OSIRIS narrow-angle camera on 17 January 2016, from a distance of 86.8 km. Measuring 3.2 km across, it captures one of the most geologically diverse areas of the comet.

Imhotep is perhaps most easily identified by the broad smooth area that occupies the centre-right portion of this view. This smooth dusty terrain, which covers about 0.8 sq km, is etched with curvilinear features stretching hundreds of metres and which have been found to change in appearance over time.

Many large boulders are also seen scattered within the smooth terrain, including the boulder Cheops in the foreground. Smaller but more numerous boulders are associated with exposed cliff faces and are most likely the product of erosion. In some debris falls, detailed analysis has revealed the presence of water ice.

Particularly eye-catching is the distinctive layered and fractured material to the left of centre in the background. Similar patterns are also seen in the exposed cliff-like faces towards the right of the scene too, where Imhotep transitions into the Khepry region.

Layers like this are seen in various locations on the comet and scientists are trying to understand how they might be related to the comet’s formation and/or evolution.

Just in front of the prominent left-hand stack of layers a number of small round features can be found. They have a well-defined rim with a smooth interior and appear slightly raised from the surrounding material. One explanation for their appearance is that they are ancient sites of active regions covered by dust and are now being revealed by varying erosion of the overlying layers.

Further in the foreground again and a relatively smooth ‘pathway’ appears to lead towards a more consolidated summit. To the left of this path is the Ash region, while the sheer apex at the top left of the view marks the boundary with Apis.

Use the comet viewer tool to aid navigation around the comet’s regions.

This image was first published on the OSIRIS image of the day website on 21 January 2016.

Credit: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

Comet in 3D

comet3D

A great 3D image from the Rosetta spacecraft.

From ESA:

A 3D anaglyph view of Comet 67P/Churyumov–Gerasimenko based on two images from Rosetta’s OSIRIS camera on 12 August 2015, capturing a spectacular jet. The two images are separated by 2 minutes 28 seconds, which corresponds to a stereo angle of 1.2º. The image scale is 3.9 m per pixel. In this orientation the Babi and Aker regions are visible on the large lobe to the left, while Ma’at and the circular Hatmehit depression are seen on the small lobe to the right. Diffuse dust emission and other jets are visible all around the nucleus.

The image is best enjoyed with red–blue/green 3D anaglyph glasses.

Check out the the blog: Comet jet in 3D

Rosetta and the Comet

Rosetta has been returning some stunning images of Comet 67P/Churyumov-Gerasimenko that ESA is putting up on the Rosetta Blog.

GC67P

This one shows 67P/G-C from a distance of 415 km / 258 miles show nice outgassing.  We are looking at the southern hemisphere some of which has been in darkness for five and a half years, just becoming visible in May.

Image: ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0

 

 

Rosetta’s Moment in the Sun

Comet 67P/Churyumov-Gerasimenko and its human-made-moon called Rosetta has now passed its closest distance to the Sun in this orbit (perihelion) and is now spending several weeks at peak activity. The activity means the flight operations team must be prepared to react to fast jets of dust and gas erupting from the comet or stray boulders ejected from its surface.

Video from ESA

The Surface of a Comet

The Philae lander shows us what the surface of Comet 67P/Churyumov–Gerasimenko looks like in this very nice image.  I don’t know what I expected to see, but this is surprisingly familiar. I wonder what the surface make up is.

philae9m

ESA/Rosetta/Philae/ROLIS/DLR

From ESA:
This image was taken by Philae’s ROsetta Lander Imaging System, ROLIS 9 m above the Agilkia landing site on the small lobe of Comet 67P/Churyumov–Gerasimenko. The image was acquired at 15:33:58 GMT on 12 November 2014. The image measures 9.7 m across and the image scale is 0.95 cm/pixel. Part of Philae’s landing gear can be seen in the top corners.

This detailed image reveals the granular texture of the comet’s surface down to the cm scale, with fragments of material of diverse shapes and random orientations seen in clusters or alone. The regolith in this region is thought to extend to a depth of 2 m in places, but seems to be free from very fine-grained dust deposits at the resolution of the images.

Rosetta’s Comet Seen From Earth

rosettaLivermore

What a really great image of Comet 67P/Churyumov-Gerasimenko!

The image was taken from the 2 meter Liverpool Telescope on 19 July 2015 (Credit: Colin Snodgrass / Geraint Jones / Liverpool Telecope). The tail is estimated to be 120,000 km / 75,565 miles.

There ia an excellent Q&A titled: CHASING A COMET FROM EARTH – UPDATE ON THE PROFESSIONAL OBSERVING CAMPAIGN on the Rosetta Blog. Definately worth the visit.

Rosetta Blog will be updating the  Amateur Observation Campaign in the near future.

Active Pits on Rosetta’s Comet

cometsinholes

On 20 September 2014, ESA’s Rosetta spacecraft made an extremely close pass to Comet 67/P Churyumov–Gerasimenko. This image was taken from just 26 km / 16 miles from the surface.

There are 18 pits identified on 67/G-C, each named for the region they are in. Some are active and some are not. This image shows the Seth series of pits, Seth_01 is the one in the center and the easiet to recognize. See this ESA post for more location information. Seth_01 is 220 m / 722 feet across and 185 m / 607 feet deep. We don’t see activity in the image, however the diversity of the terrain was the goal.

I will admit to fiddling with the image to see if I could bring out some activty but I could not. One has to wonder if the same image was taken today if activity would be seen.

ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA