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Asteroids@home
 * Projekt
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WAS IST ASTEROIDS@HOME?

is a research project that uses Internet-connected computers to do research in
Asteroids@home. You can participate by downloading and running a free program on
your computer.


Asteroids are the most numerous objects in the solar system. So far, hundreds of
thousands of asteroids are known, with hundres of new discoveries every day.
Altough the total number of known asteroids is large, very little is known about
the physical properties of individual objects. For a significant part of the
population, only the size of the bodies is known. Other physical parameters (the
shape, the rotation period, direction of the rotation axis,...) are known only
for hundreds of objects.

Because asteroids have in general irregular shapes and they rotate, the amount
of sunlight they scatter towards the observer varies with time. This variation
of brightness with time is called a lightcurve. The shape of a lightcurve
depends on the shape of asteroid and also on the viewing and illumination
geometry. If a sufficient number of lightcurves observed under various
geometries is collected, a unique physical model of the asteroid can be
reconstucted by the lightcurve inversion method.

The project Asteroids@home was started with the aim to significanly enlarge our
knowledge of physical properties of asteroids. The BOINC application uses
photometric measurements of asteroids observed by professional big all-sky
surveys as well as 'backyard' astronomers. The data is processed using the
lightcurve inversion method and a 3D shape model of an asteroid together with
the rotation period and the direction of the spin axis are derived.

Because the photometric data from all-sky surveys are typically sparse in time,
the rotation period is not directly 'visible' in the data and the huge parameter
space has to be scanned to find the best solution. In such cases, the lightcurve
inversion is very time-consuming and the distributed computation is the only way
how to efficiently deal with photometry of hundres of thousands of asteroids.
Moreover, in order to reveal biases in the method and reconstruct the real
distribution of physical parameters in the asteroid population, it is necessary
to process large data sets of 'synthetic' populations.

Asteroids@home is based at Astronomical Institute, Charles University in Prague.

Asteroids@home beitreten



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NACHRICHTEN

NEW AVX512 APPLICATION RELEASED

We are very proud to announce our new set of optimized applications that will
utilize AVX512 instruction set capable engines or to be precise those, which
support AVX512dq instructions!

These applications are built to support both Linux and Windows
64bit architecture OS. The development of this version was possible thanks to
the great help provided by ahorek's team!

Unfortunately it turns out that BOINC client applications for Windows still do
not report all processor options to the server correctly. It is because of a
known bug and even after a lot of discussions in BOINC's channels it's still
there. The good news is that thanks to ahorek's team a bugfix was already
accepted and merged into the BOINC's repository and the fix will be applied when
client version 7.26.0 is released. Till then in order to run the AVX512
application you might need to switch to the Anonymous platform.

We'd like to remind you that while the Boinc server is capable of finding the
best performing application for every particular system taking into account
multiple factors, after a while it will start sending the right one for every
particular system. Which means that even if your CPU supports AVX512dq
instructions it still might receive FMA or AVX tasks and there is nothing to be
concerned about. In such a case you might want to give a try to the so-called
Anonymous platform where your client will explicitly request the AVX512
application.

Happy crunching and thank you for your support!
Asteroids@home's team

10 Dec 2023, 3:03:07 UTC | Georgi Vidinski | Kommentieren

NEW ASTEROID MODELS - CORRIGENDUM

After a while, let me announce our paper based on the Asteroids@home project. It
was published last year in the Frontiers in Astronomy and Space Sciences:
https://ui.adsabs.harvard.edu/link_gateway/2022FrASS...909771D/PUB_HTML. We used
ATLAS photometry and its bootstrap samples to derive rotation periods (no shape)
for about 5000 asteroids.

The A@H project is currently processing data from ATLAS and Gaia together -
that's what you are computing now.

Thank you all for your contribution!

P.S. Please ignore the previous news about the paper published in Astronomy and
Astrophysics - its results were not based on A@H because, at that time, the
server was down due to COVID and hardware issues. Sorry for the confusion.

22 Sep 2023, 11:53:53 UTC | Josef Durech | Kommentieren

NEW OPENCL APPLICATION FOR AMD GPUS

Hi everyone,

We are proud to announce our new OpenCL applications for AMD GPUs!
Development process took some time but we finally managed to build it.
There are still many rough edges to be polished but thanks to you guys and to
your feedback we'll continue to improve the code.

Linux application requires 64 bit OS with GLIBC v2.31 or higher and will run on
most AMD Radeon GPU cards and some AMD Integrated Graphics with support of
OpenCL 1.1 or higher.

Windows application requres 64bit Windows 10 or 11 and will run on most AMD
Radeon cards and some AMD Integrated Graphics with support of OpenCL 1.2 or
higher.

Happy crunching and thank you for your support!

Asteroids@home team

16 Sep 2023, 15:15:42 UTC | Georgi Vidinski | Kommentieren

NEW RASPBIAN OS AARCH64 (ARMV8) APPLICATION IS HERE

Hi everyone,

A new, 64bit, version of the Period search application for the Raspberry Pi was
released today supporting aarch64 (armv8) architecture!

It will be interesting to get some feedback from you about how it performs as
there still could be some issues to be solved.

Happy crunching and don't forget to use active cooling on your boards as the app
can be very aggressive to the cores on times.

Cheers!
Georgi

21 Dec 2022, 17:57:23 UTC | Georgi Vidinski | Kommentieren

NEW FMA APPLICATION RELEASED

We are happy to present you another set of applications that will utilize those
CPUs, which possess the FMA instruction set!

It was built to support both Linux and Windows OS with 64bit architecture.
What must be taken into account with these applications is that depending on the
CPU architecture, generation, model, version, speed and number of utilized
cores, in some cases the FMA applications may run slower than the corresponding
AVX ones because of how those instructions are handled on different
architectures, details that I'll not going further here as there is a lot of
information on Internet. Also, there could be another case using even the same
FMA application. For instance, there could be a situation where on the same
particular system, having your preferences restrict the use of just a single
core of, let's say, an Intel(R) Xeon(R) W Processor Xeon W-2195 of the Skylake-W
Architecture, that single core will run much faster, close to processors' Turbo
frequency of 4.3GHz, than if your configuration allows the client to utilize
let's say 12 or more cores. In the second case those cores will run close to the
processors' base frequency of 2.3GHz, depending on their actual number, which
will result drastically in lowering of the application performance. Take a look
at this article where under the "Per Core Turbo Data" chapter you will find
explanation about how the Turbo ratio limits works.

Still, while the Boinc server is capable of finding the best performed
application for every particular system, taking into account multiple factors,
and after a while it will start sending the right one for every particular
system. Which means that even if your CPU is equipped with the FMA engine it
still might receive an AVX tasks and there is nothing to be concerned.

So happy crunching and thank you for your support!

Radim Vančo (FoxKyong)

20 Nov 2022, 20:04:38 UTC | Kyong | Kommentieren
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MORE INFO

 * Detailed information about the project (English and Czech)
 * DAMIT - Database of Asteroid Models from Inversion Techniques (English)
 * Articles and math (English)
 * Detailed article about project (Czech)


PARTICIPATE

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 * If you have any problems, get help here



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ABOUT US

The first Czech project in the system of distributed computing BOINC and the
first in the Czech Republic in the field of astronomy. This is Asteroids@home, a
project that the Czech National Team has helped bring to the world.


 * Faculty of Mathematics and Physics
   Charles University
 * Ke Karlovu 3
 * 121 16 Praha 2
 * Czech Republic


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