67P nucleus changes citizens vs scientist

Before and after perihelion images are a great way to verify theories about the connection between outbursts/outgassing/dust flow and the physical evidence of effects on the cometary nucleus surface. Figure 8 from the following paper:

'Are fractured cliffs the source of cometary dust jets? Insights from OSIRIS/Rosetta at 67P/Churyumov-Gerasimenko.'
Vincent, J.-B., et al.
http://arxiv.org/pdf/1512.03193.pdf

shows a before and after. However, after discussing features *thought* to be fractured cliffs and their detritus, the before and after images show what is *thought* to be evolving flows and *thought* to be partial collapse of a fractured cliff without detritus evidence.

Little effort is made to connect the dots for the reader to try to work out for themselves exactly what is happening and why. I think surface changes are the most fascinating things about comets.

 

Following is the images and annotations from this blog about a fairly clear overhang collapse.

Further down are the original images for context and for the reader to work out changes/evolution for themselves.

After

PHOTO CREDITS
FOR NAVCAM
Copyright ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0
To view a copy of this licence please visit:
http://creativecommons.org/licenses/by-sa/3.0/igo/
FOR OSIRIS
Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DyASP/IDA/

Anuket Crack remodelling

Following is an image of Anuket taken well before perihelion in 2014

Note the triangle of boulders and the shortish shadows.

Also a triangular platform near the main crack.

Following is a July 2016 post perihelion image of the same area in about the same resolution and a similar angle.Shadows are a bit longer. Changes are quite obvious. Boulders have moved, The triangular platform near the main crack has collapsed.

 

 These are videos overlaid to help see the changes trans perihelion. One is slow, and one is fast.

 

 

 

Hallelujah - Philae's been found

Hallelujah - Philae's been found.

The comet landing space probe lost 

Years ago when it went to ground,

Into a shadowy nook tossed.

Out of the sun, it went to sleep.

Mother ship Rosetta searched on.

But from Philae, nary a peep.

Where could the little probe have gone?

Rosetta found the little one,

And sent the good news back to Earth.

Some needed closure thus was done

For the mission - for what it's worth.

Philae with Rosetta in flight,

Cometing into the dark night.

Abydos Orientation

See images to work out what you are looking at and the area of Abydos from many different angles, lighting and magnification.

Colours are an attempt to identify features such as perihelion cliff here, marked in green and orange roughly where I think they are on the Navcam and OSIRIS images below.

Magenta is approximated Philae position. Blue is a prominent egg shaped boulder for reference.

White Quadrangle is roughly the area bounded by the Philae discovery image second image below.

 

Image Credits

FOR NAVCAM
Copyright ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0
To view a copy of this licence please visit:
http://creativecommons.org/licenses/by-sa/3.0/igo/
FOR OSIRIS
Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DyASP/IDA/
All lines and dotted annotations by Marco Parigi

Here's Philae - I have found him

The wider Picture: Follows are OSIRIS images, first pre-landing - Philae not in this one.

Next two - Post landing - Philae is now visible and perihelion cliff can be identified.

Perihelion cliff marked from CIVA image

Perihelion cliff marked with small red and green dots, from Pre-landing close up of the area.

Follows are recent July 2016 NAVCAM images with a distinct glint (saturates pixel) in exactly the same location identified above.

Second July 2016 NAVCAM image shows same glint in same location - therefore not an artefact.

Following is close ups of the above - The tell tale glint from Philae in the centre of images.

There are several other images not listed here that also show Philae, but this is the location that the ESA will soon announce with much fanfare as a conclusive location for Philae. Close OSIRIS images from 5 km from the surface should now resolve any parts of Philae that may be exposed showing this glint. It could be as little as a foot or leg.

Image Credits

FOR NAVCAM
Copyright ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0
To view a copy of this licence please visit:
http://creativecommons.org/licenses/by-sa/3.0/igo/
FOR OSIRIS
Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DyASP/IDA/
All lines and dotted annotations by Marco Parigi