Universe Guide


Leonids Meteor Shower

The Leonids meteor shower takes place within the boundaries constellation of the Leo. The meteor showers occurs between November 13-20 with the peak occuring on the Nov. 17/18 every year The Solar Longitude, mistakenly known as Lambda Omicron is 235 degrees. This value sometimes expressed as S.L. or λ ☉ 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 Leonids Meteor Shower radiate point east of Adhafera , just around about where the Lion`s Head is. It is a heavy Meteor Shower compared to other meteor showers such as Piscis Austrinids.

The comet associated with the Meteor Shower is a short term comet which orbits the Sun every 33 years. Some comets journey can take thousands of years to complete an orbit which is why Tempel-Tuttle is referred to as a short term one. When the comet comes close to The Sun, the meteor shower can be quite spectacular such as in 1833.

The source of the meteor shower is 55P/Tempel-Tuttle. The closest star to the radiant point of the meteor shower is Adhafera. The coordinates can also be determined by the Right Ascension (153.8) and the Declination (21.8).

The Zenith Hourly Rate or how many you expect to see during the hour is 100. The ZHR can radically increase if the comet or associated object is close by. The speed/velocity of the Meteor Shower particles is 70 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.

Related Meteor Showers :-

Recent and Forthcoming Meteor Showers :-

Leonids Meteor Shower Facts

Associated Comet55P/Tempel-Tuttle
Closest Star to Radiant PointAdhafera
Max Activity Date17 Nov
Population Index3
Activity PeriodNovember 13-20
Right Ascension153.8
Solar Longitude / λ ☉235 °
Zenith Hourly Rate100
Semi-Major Axis6.6300

Location of the Radiant Point for the Leonids Meteor Shower

Map showing the location of where the Leonids radiate from within Leo

Add a Comment

Email: (Optional)