Population index

The population index, or r-value, indicates the magnitude distribution of a meteor shower. Values below 2.5 correspond to distributions where bright meteors are more frequent than average, while values above 3.0 mean that the share of faint meteors is larger than usual.[1] Population indices are not solely associated with meteor showers.

References

Molau, Sirko (2015). "Introduction". Population index reloaded (Thesis). Harvard University. Retrieved 11 July 2023.

Meteor showers
By name	Andromedids Antihelion Source Aquariids eta Aquariids kappa Aquariids North delta Aquariids North iota Aquariids South iota Aquariids Southern Delta Aquariids tau Aquariids Aquilids South June Aquilids Arietids Daytime eps. Arietids Daytime May Arietids Aurigids alpha Aurigids delta Aurigids Nov. iota Aurigids Bootids (June Bootids) Canis-Minorids Cancrids (delta Cancrids) Capricornids alpha Capricornids Daytime Capri.-Sagitt. Carinids (eta Carinids) Cassiopeids (beta Cassiopeids) Centaurids alpha Centaurids omicron Centaurids Cetids omega Cetids pi Cetids Comae Berenicids Cygnids (kappa Cygnids) Doradids (gamma Doradids) Draconids Eridanids (eta Eridanids) Geminids (epsilon Geminids) Herculids (tau Herculids) Hydrids (sigma Hydrids) Leonids Leonis Minorids (Dec. Leonis Minorids) Lyrids eta Lyrids June Lyrids Monocerotids alpha Monocerotids Normids (gamma Normids) Orionids Pegasids Perseids Daytime zeta Perseids September epsilon Perseids Phoenicids (July Phoenicids) Piscis Austrinids Puppids (pi Puppids) Puppid-Velids Quadrantids Scorpiids alpha Scorpiids North omega Scorpiids South omega Scorpiids Serpentids (kappa Serpentids) Sextantids (Daytime Sextantids) Taurids Daytime beta Taurids Northern Taurids Southern Taurids theta Centaurids Ursids Virginids alpha Virginids gamma Virginids eta Virginids theta Virginids iota Virginids lambda Virginids mu Virginids pi Virginids psi Virginids March Virginids
By peak date	January 4 February 8 February 10 March 14 April 17 April 22–23 April 26 May 6 June 7 June 27 July 28–29 July 13 July 30 July 31 – August 1 August 13 September 1 October 8 October 10 October 21 October 22 November 9 November 12 November 18 November 21–22 December 5–6 December 13–14 December 15 December 22
Related topics	American Meteor Society Earth-grazing fireball International Meteor Organization Meteor procession North American Meteor Network Population index Radiant Zenithal Hourly Rate
See also List of meteor showers

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