| 词条 | Sigma Hydrids |
| 释义 |
Sigma Hydrids are minor (faint) meteor shower with peak on 11 December. ZHR is 3-5 and population index is 3. They are active from December 4 to 15. Sigma hydrids were discovered by Richard E. McCrosky and Annette Posen. References
3 : Meteor showers|December events|Hydra (constellation) |
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