3D shape, cartography, and geoid of Comet 67P C-G Options

[mcgyver]

I collected these data from various sources:

CODE

Data,Earth,67p
Semimajor axis (10^6 km),           149.6,    518,    a
Sidereal orbit period (days),      365.3,    6.4400, years    period
Perihelion  (10^6 km),      147.1,    186,    q
Aphelion (10^6 km),      152.1,    850,    Q
Orbit inclination (deg),           0,    7.0402009,    i
Orbit eccentricity,                0.0167,    0.64097393,    e
Sidereal rotation period (hrs),    23.9,    12.4043,
Date of perihelion transit,    -,    2015-Aug-13 01:43:31,    Tp
Argument of perihelion,    -,    12.78560607,    peri
Longitude of the ascending node,    -11.26064,    50.14210951,    node
Mean anomaly,    355.53,    319.3033468,    M
Mean motion,    -,    0.15295360°/day,    n
North pole RA,    -,    69.3,
North Pole Dec,    90,    64.1,
Obliquity to orbit (deg),          23.4,    52,

This should make easier to calculate comet season, for better predicting when Philae will get more sun.

[Astro0]

Last night I attended a fantastic talk on Rosetta operations and science results in Canberra.

The presenters were Dr Paolo Ferri, ESA's Head of Mission Operations and Professor Mark McCaughrean, Senior Science Advisor in the Directorate of Science & Robotic Exploration at ESA.


My work colleague Dr Korinne McDonnell, ESA's Prof Mark McCaughrean and Dr Paolo Ferri and me.

During the talk they showed a bunch of great images and used Mattias' wonderful shapemodel animation of 67P during the presentation, noting the great work being done in the amateur community. Well done!

Another highlight was a sneak preview of the next instalment in the 'Adventures of Rosetta and Philae' animated films. We weren't allowed to record it but they said it would be released in a few days.

[Malmer]

Made some 360 animations of my 67p shapemodel.

http://youtu.be/yBltmJ2qzdM

http://youtu.be/zdLp3g27Ha8

and without the dust

http://youtu.be/RXun2zjriB0

http://youtu.be/0mUSipvi-d4

Textures and stuff will be released as soon as they are a little more polished.

[Gerald]

Proper inference of the 3d volume structure of the jets is really non-trivial. The best approach I'm knowing of is called computer tomography, in a broader sense, with lot of number crunching, see e.g. this paper.
Great achievement!

[Mercure]

Truly astounding model, Malmer. I have a first generation Oculus Rift and I can only imagine how cool it will be to manipulate and navigate around your model with the soon-to-be-released hi-res consumer version. We're on the brink of a new era in scientific visualisation, and I think a model such as yours will be a prime example of what can be done.

[Malmer]

I built a little webpage that displays Rosettas view of 67P. Updated every 10 minutes...

http://mattias.malmer.nu/rosetta-now/

[elakdawalla]

That is so cool, thank you! Would it be possible to make a version that allows a user to simulate the view in the past at a specific time?

[Malmer]

Thanks!

Well... As it is now I'm rendering the images offline a couple of days in advance. So there is currently no way of it to display images outside the range of already rendered views. (First image being 2015 apr 18 00:00)

But I will continue rendering and I was thinking about adding some kind of time request or animation feature.

It has been a lot to learn in one go. First time writing c code. First time using spice, first time using php and first time in prolly 16 years writing html. So much fun.

First up is adding some dust (it is a comet afterall)

[Malmer]

Added a two hour animation loop centered on the current time. Makes it easier to get a feel for the motion.

[DoF]

Great work Malmer, the loop is a good addition. A further improvement that could be done is to add the timestamps for the loop images in a list somewhere, which would show that timestamps render when you mouse over it. That way you could also go through the loop sequence at your own pace if you wanted to by simply slowly (or quickly) moving the mouse over the list of timestamps.

[Phil Stooke]

Aha! I've discovered an amazing map projection which will work brilliantly with our (current) favourite comet nucleus. And it's not brand new, it's hundreds of years old. Admittedly it needs a bit of tweaking. Unfortunately I can't tell you any more right now - but fear not, a solution to the mapping problem is at hand. I won't be doing anything with this until we have seen the southern hemisphere properly.

Phil

[Malmer]

So you have found a marvelous projection but the margin is too narrow to contain it?

[Malmer]

My new shapemodel:

http://mattias.malmer.nu/2015/05/new-shape...navcam-bonanza/

It has a new global map aswell.

[charborob]

A new interactive viewer for comet 67P/C-G has been produced by ESA. It also gives easy access to Navcam images. Worth a try.
Rosetta blog
Viewer

[elakdawalla]

OMG