Archive for 2010

The Geminids are one of the best meteor showers of the year with numerous (ZHR~120) and bright (r~2) meteors! The parent body is an asteroid named 3200 Phaethon, which is believed to be a candidate for an extinct cometary nucleus, a mystery by itself. Moreover, during the last perihelion passage of the asteroid its magnitude increased […]

Changing file ownership

Posted November 29, 2010 By grigoris

These are two commands to help us change the ownership of files, but we must be in the root or su mode first. > chown <username> <file/folder> : used to change the owner of a file or folder > chgrp <group> <file/folder> : used to change the group of a file or folder > chown […]

Extracting rpm and deb packages

Posted November 4, 2010 By grigoris

[ Information from G-Loaded journal – many thanks! ] The packages rpm and deb are used mainly by the package managers in order to easilly and successfully install any additional stuff. At the same time rpm and deb packages are also archives (cpio and ar archives respectively) that can be axtracted. One way is of […]

Installing WCSTools

Posted October 4, 2010 By grigoris

“WCSTools is a package of programs and a library of utility subroutines for setting and using the world coordinate systems (WCS) in the headers of the most common astronomical image formats, FITS and IRAF .imh, to relate image pixels to sky coordinates. This software is all written in very portable C, so it should compile […]

Exif meta editing

Posted September 30, 2010 By grigoris

If you want to mess with the exif headers of your pictures there are a couple (not only of course!) of useful tools: >> jhead (for jpeg images) >> exiftool (supporting many different file formats).

Using wine

Posted September 27, 2010 By grigoris

The command to start a program through wine from terminal or through a shortcut is: env WINEPREFIX=”/home/user/.wine” wine “C:/somefolder/name.exe” The wine is a open source simulator to run windows software under linux (and others).

Welcome (again) …

Posted September 1, 2010 By grigoris

to a new and more serious attempt* to build a site about my personal work on Astronomy, a long-time hobby that became a demanding job since June 2010! Mainly, the blog will work as a personal notebook where you may (or may not!) find something useful. You will be able to find from small tips […]

Hypervelocity star – HE 0437-5439

Posted August 3, 2010 By grigoris

An interesting story on hypervelocity stars. Around 16 know since 2005, one of them being the HE 0437-5439 which travells at 2.5 million kilometers / hour. The puzzle about this is that it is too young to have travelled so far from the Wilky Way (200 000 light-years over the disk plane). The story (?): […]

The 4th Panhellenic Meeting of Amateur Astronomers took place in a magnificent area, at the mountain refugee of the Mountaineering Club of Sparta at Mt. Parnonas. The place is located at ~1400m with a huge field working as the best place to park cars and set up all the necessary equipment. Moreover, the area around […]

First observations from Skinakas

Posted July 26, 2010 By grigoris

From 30/6 up to 5/7 I found myself observing from Skinakas Observatory for the first time (doing photometry tests on a number of exoplanet candidates) ! That was really a great experience and I enjoyed much both the procedure of observations and the stay there at the mountaintop. Only the weather could have been a […]