Meteor shower calendar

Open the calendar for the desired year: [2007] [2008] [2009].

For the main annual meteor showers, the radiant name, activity interval and the date of maximum are given, together with other data:

• R.A. and Decl.: Right ascension and declination of radiant at maximum, referred to ICRS. ICRS is the reference system used by modern star catalogs.
• Vg: Geocentric velocity in km/s, without accounting for acceleration due to Earth's gravity field.
• ZHR: Zenith Hourly Rate. It is the maximum number of meteors that an observer could see under ideal conditions, with clear skies and the radiant at zenith.
• % Moon: Percentage of Moon's illumination at 0h TT of maximum's day.

The home page includes a daily ephemeris for annual showers. Due to their nature, meteor shower predictions are approximate, so the appropriate caution must be taken when using the ephemerides. ZHR prediction is notably difficult, and is consequently omitted sometimes.

Predictions are based on data from:

• International Meteor Organization.
• IAU Meteor Data Center.
• IAU Telegrams.