The Solar Longitude (Abbrev: S.L., λ ☉) is 32.32 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 .
Lyrids is a Meteor Shower that falls just to the east of constellation of Lyra. It could be said that the meteor shower is more Hercules than Lyra but it has been given to Lyra. It is associated with the comet C/1861 G1 Thatcher which is a mid-range comet with its orbit taking 415 years, considerable longer than Encke but not as long as Hyakutake which estimated at 40,000 Years.
The source of the meteor shower is Thatcher. The closest star to the radiant point of the meteor shower is Vega. The coordinates can also be determined by the Right Ascension (271) and the Declination (34).
The Zenith Hourly Rate or how many you expect to see during the hour is 18. The ZHR can radically increase if the comet or associated object is close by. The speed/velocity of the Meteor Shower particles is 49 km/s. The population index of the meteor shower is 2. 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, faint meteors are more frequent.
|Closest Star to Radiant Point||Vega|
|Max Activity Date||22 Apr|
|Activity Period||April 16-25|
|Solar Longitude / λ ☉||32.32 °|
|Zenith Hourly Rate||18|