Friday, September 30, 2016

Python Scripting Language for Linux, Mac, and Windows Operating Systems

Python for Linux:

Welcome! Are you completely new to programming? If not then you will be looking for information about why and how to get started with Python. Fortunately an experienced programmer in any programming language (whatever it may be) can pick up Python very quickly. It's also easy for beginners to use and learn, so jump in!
If there are certain features you might want to use that are not available on your distro’s package. You can easily compile the latest version of Python from source. 
In the event that Python doesn’t come pre-installed and isn’t in the repositories as well, 
you can easily make packages for your own distro.

Installing Python is generally easy, and nowadays many Linux and UNIX distributions include a recent Python. Even some Windows computers (notably those from HP) now come with Python already installed. If you do need to install Python and aren't confident about the task you can find a few notes on the BeginnersGuide/Download wiki page

Before getting started, you may want to find out which IDEs and text editors are tailored to make Python editing easy, browse the list of introductory books, or look at code samples that you might find helpful.

There is a list of tutorials suitable for experienced programmers on the BeginnersGuide/Tutorials page. There is also a list of resources in other languages which might be useful if English is not your first language.

The online documentation is your first port of call for definitive information. There is a fairly brief tutorialthat gives you basic information about the language and gets you started. You can follow this by looking at the library reference for a full description of Python's many libraries and the language reference for a complete (though somewhat dry) explanation of Python's syntax. If you are looking for common Python recipes and patterns, you can browse the ActiveState Python Cookbook

for Slackware users

A new all sky star catalog of our very own favorite galaxy is released.

Gaia started its scientific work in July 2014. This first release is based on data collected during its first 14 months of scanning the sky, up to September 2015.

"Today's release gives us a first impression of the extraordinary data that awaits us and how that will revolutionize our understanding of how stars are distributed and move across our galaxy."

"The beautiful map we are publishing today shows the density of stars measured by Gaia across the entire sky, and confirms that it collected superb data during its first year of operations” 

says Timo Prusti, Gaia project scientist at ESA.

The September 2016 release

Will have information about positions (α, δ) and G magnitudes for all stars with acceptable formal standard errors on positions. Positions and individual uncertainties are computed using a generic prior and bayes' rule detailed in the "Gaia astrometry for stars with too few observations. A Bayesian approach" For this release approximately 90% of the sky will be covered. At the beginning of the routine phase, a special scanning mode repeatedly covering the ecliptic poles on every spin was executed for calibration purposes. Photometric data of RR lyrae and Cepheid Variable Stars including these high-cadence measurements will be released. The five parameter astrometric solution positions, parallaxes, and proper motions for stars in common between the Tycho 2 Catalog and Gaia will be released. The catalog is based on the Tycho-Gaia Astrometric Solution. (Image of the Week with short TGAS description; paper with a more detailed description; paper describing theory and background; paper describing quasar extension)

Future releases may Include: 

Five parameter astrometric solution of objects with single star behavior will be released under the assumption that at least 90% of the sky can be covered. Integrated BP/RP photometry, with appropriate standard errors for sources where basic astrophysical parameter estimation has been verified. Mean radial velocities for objects showing no radial velocity variation and for which an adequate synthetic template could be selected, under the assumption that this can be done for 90% of the bright stars on the sky.

Orbital solutions, together with the system radial velocity and five parameter astrometric solutions, for binary having periods between 2 months and 75% of the observing time will be released. Object classification and astrophysical parameters, together with BP/RP spectra and/or RVS spectra they are based on, will be released for spectroscopically and photometrically well behaved objects. Mean radial velocities will be released for those stars not showing variability and with available atmospheric parameter estimates.

Variable star classification will be released together with the epoch photometry used for the stars. Solar system results will be released with preliminary orbital solutions and individual epoch observations. Non single star catalogs will be released. Full astrometris, photometric and radial velocity catalogs will alse be released. All available variable star and non single star solutions. Source classification plus multiple asrtophysical parameters for stars, unresolved binaries, galaxues, and quasars. Some parameters may not be available for fainter stars.

Also to be released!

An Exo Planet List

All Epoch and transit data for these planets.

All ground based observations made for data processing. 

We look forward to the full data releases coming and upcoming discoveries.