The British Astronomical Association was formed in 1890 and membership is open to all persons interested in astronomy. It has an international reputation for the quality of its observational and scientific work.

The Computing Section began in 1920. Its work is nowadays largely concerned with the preparation of the annual Handbook of the British Astronomical Association, together with data for other publications.

On this site you will find, amongst other things,

  • useful observing aids in the form of applets and scripts, calculating in real time, often with a detailed graphical display;
  • finder charts for currently visible comets and asteroids;
  • Handbook sections additional data, which changes little from year to year;
  • background information about the Handbook and its contributors;
  • history of the Computing Section.

BAA members can download a PDF version of the Handbook from the Downloads option on the logged-in Members menu of the main BAA site.

What's observable

Asteroid & comet charts

Jupiter's satellites

Saturn's satellites

Various calculators


What's new

You may need to clear your browser's cache to see latest changes (in Windows: Ctrl+F5).

The charts pages (asteroids and comets) are frequently revised, so will not be listed here every time.

Contact the British Astronomical Association

Section Director
Steve Harvey

Section Director, Steve Harvey

Contact Steve

This year's HandbookThis year's Handbook