The Sigma Hydrids meteor shower takes place within the boundaries constellation of the Hydrus. The meteor showers occurs between Dec 03 - Dec 15 with the peak occuring on the Dec 12 every year.
The Solar Longitude (Abbrev: S.L., λ ☉) is 252.9 degrees, this value is the the date of maximum activity. It is measured as a degree with zero degree indicating spring equinox (roughly March 21st/22nd). 90 is the Summer Solstice, 180 is the Autumn Equinox and 270 is the Winter Solstice. This degree is independent of the calender. AMS .
Hydra the constellation associated with this meteor Shower is the biggest constellation in the sky. It represents in one legend the monster that Hercules slayed. Even though the constellation is big, the meteor shower on the other hand is very faint and not spectacular. Given the faintness and there not being many meteors in the shower, it could be assumed that the source of the material for this is a long-period comet and that what we hit is the last remaining remnants of its tail that has not yet burnt up.
The closest star to the radiant point of the meteor shower is Minchir. The coordinates can also be determined by the Right Ascension (123.2) and the Declination (3).
The Zenith Hourly Rate or how many you expect to see during the hour is 3. The ZHR can radically increase if the comet or associated object is close by. The speed/velocity of the Meteor Shower particles is 59 km/s. The population index of the meteor shower is 3. The population index refers to the magnitude distribution of the meteorites, the smaller the index, the brighter the meteors are, the higher, the dimmer the meteors are. For this particular meteor shower, bright meteors are more frequent.
|Closest Star to Radiant Point||Minchir|
|Max Activity Date||12 Dec|
|Activity Period||Dec 03 - Dec 15|
|Solar Longitude / λ ☉||252.9 °|
|Zenith Hourly Rate||3|