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 When a comet passes through the inner Solar System, the interaction with the solar wind activates its surface. The gases and materials from the comet's surface are expulsed into space and orbit the Sun, in orbits very similar to those of the comet it came from. This forms a ring or stream of particles, technically called the meteor shower.
The terrestrial orbit crosses some swarms of short-period comets, producing meteorite showers every year, such as Leonidas and the Perseidas. When the activity of a shower of meteorites exceeds 1000 meteorites per hour, it is called a meteorite storm.
It is believed that some comets may be exhausted asteroids, comets that have lost all their volatile elements. That is why some showers may originate from ateroides, which is the case of las Gemínidas, which is found in the orbit of the asteroid. METEOR SHOWER CALENDAR 2012 Quadrantids Interval: 27 december al 13 of january Date of maximum activity: 04 of january 2012 Right ascension: 230° declination of radiant at maximum: 50° Geocentric velocity in km/s.: 41 Hourly Rate: 120 Percentage of illumination of the Moon: 75 alpha-Centaurids Interval: 28 of january al 21 february Date of maximum activity: 08 february 2012 Right ascension: 211° declination of radiant at maximum: -58° Geocentric velocity in km/s.: 56 Hourly Rate: 6 Percentage of illumination of the Moon: 100 Lyrids Interval: 16 april al 25 april Date of maximum activity: 22 april 2012 Right ascension: 273° declination of radiant at maximum: 33° Geocentric velocity in km/s.: 49 Hourly Rate: 18 Percentage of illumination of the Moon: 0 pi-Puppids Interval: 14 april al 27 april Date of maximum activity: domingo, 23 april 2012 Right ascension: 110° declination of radiant at maximum: -45° Geocentric velocity in km/s.: 18 Tasa horaria cenital: - Percentage of illumination of the Moon: 3 eta-Aquarids Interval: 18 april al 27 mayo Date of maximum activity: 05 mayo 2012 Right ascension: 339° declination of radiant at maximum: -0° Geocentric velocity in km/s.: 66 Hourly Rate: 60 Percentage of illumination of the Moon: 98 eta-Lyrids Interval: 3 mayo al 17 mayo Date of maximum activity: 08 mayo 2012 Right ascension: 290° declination of radiant at maximum: 42° Geocentric velocity in km/s.: 44 Hourly Rate: 3 Percentage of illumination of the Moon: 95 June Bootids Interval: 21 june al 1 july Date of maximum activity: 23 june 2012 Right ascension: 216° declination of radiant at maximum: 38° Geocentric velocity in km/s.: 15 Tasa horaria cenital: - Percentage of illumination of the Moon: 11 Piscis Austrinids Interval: 15 july al 9 august Date of maximum activity: 27 july 2012 Right ascension: 341° declination of radiant at maximum: -30° Geocentric velocity in km/s.: 35 Hourly Rate: 5 Percentage of illumination of the Moon: 57 South. delta-Aquarids Interval: 12 july al 18 august Date of maximum activity: 28 july 2012 Right ascension: 339° declination of radiant at maximum: -16° Geocentric velocity in km/s.: 40 Hourly Rate: 20 Percentage of illumination of the Moon: 68 alpha-Capricornids Interval: 2 july al 15 august Date of maximum activity: 30 july 2012 Right ascension: 307° declination of radiant at maximum: -10° Geocentric velocity in km/s.: 23 Tasa horaria cenital: 4 Percentage of illumination of the Moon: 87 Perseids Interval: 16 july al 25 august Date of maximum activity: 12 august 2012 Right ascension: 48° declination of radiant at maximum: 58° Geocentric velocity in km/s.: 59 Hourly Rate: 100 Percentage of illumination of the Moon: 30 kappa-Cygnids Interval: 3 august al 26 august Date of maximum activity: 17 august 2012 Right ascension: 278° declination of radiant at maximum: 59° Geocentric velocity in km/s.: 25 Hourly Rate: 3 Percentage of illumination of the Moon: 1 alpha-Aurigids Interval: 24 august al 7 september Date of maximum activity: 31 august 2012 Right ascension: 84° declination of radiant at maximum: 42° Geocentric velocity in km/s.: 66 Hourly Rate: 7 Percentage of illumination of the Moon: 99 September Perseids Interval: 4 september al 17 september Date of maximum activity: 09 september 2012 Right ascension: 60° declination of radiant at maximum: 47° Geocentric velocity in km/s.: 61 Hourly Rate: 5 Percentage of illumination of the Moon: 46 kappa-Aquarids Interval: 7 september al 1 october Date of maximum activity: 21 september 2012 Right ascension: 334° declination of radiant at maximum: -14° Geocentric velocity in km/s.: 13 Hourly Rate: 3 Percentage of illumination of the Moon: 30 Draconids Interval: 7 october al 11 october Date of maximum activity: 08 october 2012 Right ascension: 264° declination of radiant at maximum: 58° Geocentric velocity in km/s.: 20 Hourly Rate: 20 Percentage of illumination of the Moon: 53 Orionids Interval: 1 october al 10 november Date of maximum activity: 21 october 2012 Right ascension: 95° declination of radiant at maximum: 16° Geocentric velocity in km/s.: 66 Hourly Rate: 23 Percentage of illumination of the Moon: 37 Leo Minorids Interval: 19 october al 26 october Date of maximum activity: 23 october 2012 Right ascension: 161° declination of radiant at maximum: 38° Geocentric velocity in km/s.: 62 Hourly Rate: 2 Percentage of illumination of the Moon: 59 Southern Taurids Interval: 24 september al 26 november Date of maximum activity: 05 november 2012 Right ascension: 55° declination of radiant at maximum: 15° Geocentric velocity in km/s.: 31 Hourly Rate: 5 Percentage of illumination of the Moon: 72 Northern Taurids Interval: 24 september al 26 november Date of maximum activity: 10 november 2012 Right ascension: 56° declination of radiant at maximum: 22° Geocentric velocity in km/s.: 31 Hourly Rate: 5 Percentage of illumination of the Moon: 21 Leonids Interval: 8 november al 27 november Date of maximum activity: 17 november 2012 Right ascension: 154° declination of radiant at maximum: 22° Geocentric velocity in km/s.: 71 Hourly Rate: 8 Percentage of illumination of the Moon: 14 alpha-Monocerotids Interval: 15 november al 24 november Date of maximum activity: 21 november 2012 Right ascension: 117° declination of radiant at maximum: 1° Geocentric velocity in km/s.: 65 Hourly Rate: 4 Percentage of illumination of the Moon: 54 December Phoenicids Interval: 28 november al 8 december Date of maximum activity: 06 december 2012 Right ascension: 18° declination of radiant at maximum: -53° Geocentric velocity in km/s.: 18 Hourly Rate: - Percentage of illumination of the Moon: 57 Puppid/Velids Interval: 30 november al 14 december Date of maximum activity: 06 december 2012 Right ascension: ?123° declination of radiant at maximum: -45° Geocentric velocity in km/s.: 40 Hourly Rate: 10 Percentage of illumination of the Moon: 57 Monocerotids Interval: 18 november al 17 december Date of maximum activity: 07 december 2012 Right ascension: 102° declination of radiant at maximum: 8° Geocentric velocity in km/s.: 42 Hourly Rate: 2 Percentage of illumination of the Moon: 46 sigma-Hydrids Interval: 29 november al 21 december Date of maximum activity: 10 december 2012 Right ascension: 127° declination of radiant at maximum: 2° Geocentric velocity in km/s.: 58 Hourly Rate: 3 Percentage of illumination of the Moon: 16 Geminids Interval: 30 november al 18 december Date of maximum activity: 13 december 2012 Right ascension: 114° declination of radiant at maximum: 32° Geocentric velocity in km/s.: 35 Hourly Rate: 120 Percentage of illumination of the Moon: 0 Coma Berenicids Interval: 4 december al 1 february Date of maximum activity: 19 december 2012 Right ascension: 175° declination of radiant at maximum: 22° Geocentric velocity in km/s.: 64 Hourly Rate: 4 Percentage of illumination of the Moon: 38 Ursids Interval: 17 december al 25 december Date of maximum activity: 22 december 2012 Right ascension: 219° declination of radiant at maximum: 75° Geocentric velocity in km/s.: 33 Hourly Rate: 10 Percentage of illumination of the Moon: 67 |
