Posts by Markus Sadeniemi
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1) Message boards : Number crunching : No new tasks? (Message 6292)
Posted 26 May 2019 by Markus Sadeniemi
You can choose a primary task (asteroids) and a secondary task (rosetta, for example). When you notice that asteroids is down, start rosetta. When asteroids returns online say "no new tasks" to rosetta and run the two in parallel until your rosetta que is empty.

This has saved me from frustration.

2) Message boards : Science : Aspect ratio of asteroids (Message 5664)
Posted 26 Jan 2018 by Markus Sadeniemi
The interstellar asteroid Oumuamua passed the solar system recently. It's aspect ratio is very strange. It's length/bredth ratio is supposed to be around 10:1.

Does the aspect ratio of any asteroid, whose shape we have calculated, come even close to that. Or even 5:1 or 4:1 ?

3) Message boards : Science : Are all asteroids convex? (Message 3785)
Posted 16 Nov 2014 by Markus Sadeniemi
Thank you!

4) Message boards : Science : Are all asteroids convex? (Message 3779)
Posted 13 Nov 2014 by Markus Sadeniemi
The science page of asteroids@home tells us:

"The results are asteroid convex shape models with the direction of the spin axis and the rotation period."

The comet TÅ¡urjumov-Gerasimenko now filling the news is definitely not convex. It looks more like a rubber duck. Yes, I know that it is a comet, not an asteroid, but still I am curious
- are all asteroids convex
- is it theoretically impossible to detect non-convex asteroids or
- would it be an order of magnitude more heavy to compute a non-convex model?

5) Message boards : Wish list : Show progress on homepage (Message 767)
Posted 31 Jan 2013 by Markus Sadeniemi
Like this page on the main project website:

Me too. I notice that the page has been updated to include pictures and other
information of more than the first two asteroids.

Thank you!

6) Message boards : Wish list : Project marketing (Message 543)
Posted 2 Jan 2013 by Markus Sadeniemi
Asteroids@home project has one advantage over many others: the results are understandable for everyone. An asteroid is a piece of rock or ice that circles around the sun, it has a shape and colour and it rotates at certain speed. If you show a picture of it and give some parameters, then everyone gets an idea what it looks like. The same cannot be said of most @home projects. Nobody can show me proteine folding in a way that would make me any wiser!

Perhaps asteroids@home could take benefit from this.

1 Make a simple counter on the web page: "We have so far calculated xxx asteroids." That should be easy.

2 On page you have info on two asteroids. Make instead an "asteroid of the month" -page to show a new asteroid every month (or week).

The page could contain pictures of the asteroid, rotation axes and speed, diameter and perhaps Keplerian elements of its orbit.

I would guess, that most asteroids look dull. They are sperical and don't have color variation. Probably "asteroid of the month" should not be an average one, but rather one that is ice on one side and dusty on the other or pehaps has a cigar-like shape. Something that would make one different from another.

3 Even better would be, if this could be made personal. "This is what *your* asteroid looks like". (With *your* meaning, you calculated the last piece needed for this asteroid.)

I wonder how it could be delivered to the person in question. Personal web page? Screen saver? Dullness might be a real problem as there would not be many asteroid models to choose from.

Something like this could make the project more attractive to potential participants (and maybe teach some astronomy for a few people).

Markus Sadeniemi
7) Message boards : Science : Advances counted in the nuber of asteroids, not credits (Message 531)
Posted 30 Dec 2012 by Markus Sadeniemi
Thank you!

8) Message boards : Science : Advances counted in the nuber of asteroids, not credits (Message 522)
Posted 27 Dec 2012 by Markus Sadeniemi
Some questions out of curiosity. Not really science but not number crunching either:

It is said that it takes a lot of cpu to calculate the rotation and other properties of an asteroid. Huw much is a lot? Ten/ten thousand/ten million cpu hours?
With this capasity we participans now provide, how much do we manage to calculate (say) within a month?
I understood that you start by testing the system with artificial data. When do you expect to be able to move to the real thing?
Have more than the two asteroids mentioned in the web page been calculated? How many?

Markus Sadeniemi

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