The Solar Longitude (Abbrev: S.L., λ ☉) is 336 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 .
The Delta Leonids are one of a few meteor showers that are associated with the Leo, the Lion constellation. The major meteor shower for Leo is the Leonids which occur in November. This one is so called because the radiant point is near Zosma, also known as Delta Leonis star.
The source of the meteor shower is Comet Tempel-Tuttle. The closest star to the radiant point of the meteor shower is Zosma. The coordinates can also be determined by the Right Ascension (168) and the Declination (16).
The Zenith Hourly Rate or how many you expect to see during the hour is 2. The ZHR can radically increase if the comet or associated object is close by. The speed/velocity of the Meteor Shower particles is 23 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||Zosma|
|Max Activity Date||25 Feb|
|Activity Period||Feb 15 - Mar 10|
|Solar Longitude / λ ☉||336 °|
|Zenith Hourly Rate||2|