Absolute magnitude from an absolute magnitude in a specific filter band to absolute bolometric magnitude, a bolometric correction is applied. For Solar System bodies that shine in reflected light, a different definition of absolute magnitude (H) is used, based on a standard reference distance of one astronomical unit. In stellar and galactic astronomy, the standard distance is 10 parsecs (about 32.616 light-years, 308.57 petameters or 308.57 trillion kilometres). A star at 10 parsecs has a parallax of 0.1″ (100 milliarcseconds). Galaxies (and other extended objects) are much larger than 10 parsecs, their light is radiated over an extended patch of sky, and
Fit-PC feature variations, though only 7 models have been announced so far. On September 16, 2008, Compulab announced the Fit-PC Slim, which at 11 x 10 x 3 cm is smaller than fit-PC 1.0. fit-PC Slim uses 500 MHz AMD Geode LX800 processor and has 512mb soldered-on RAM. The computer includes a VGA output, a serial port with a custom connector, Ethernet, b/g WLAN, and 3 USB ports (2 on the front panel). The system has an upgradeable 2.5" 60GB ATA hard drive. fit-PC Slim has General Software BIOS supporting PXE and booting from a USB CDROM or USB thumb drive.