2017 Visibility Forecast
75
Visibility Score
75.6
Expected /hr
82.9%
Moon Illum.
very_poor
71.8°
Best Alt.
at 22:00
Radiant Altitude & Hourly Rate (Peak Night)
Açıklama
Most popular meteor shower, peaking on warm August nights. Rural rates 50-100/hr at maximum. Swift with persistent trains and bright meteors.
Geçmiş
First recorded 36 AD by Chinese astronomers. Comet 109P/Swift-Tuttle period ~133 years, last perihelion 1992.
Radiant Position
Shower Properties
IAU CodePER
ClassMajor Shower
ZSH100
Velocity59.0 km/s
Speed ClassSwift (>50 km/s)
Pop. Index (r)2.2
Radiant RA48.0°
Radiant Dec+58.1°
Peak Sol. Lng.140.0°
Ana Cisim109P/Swift-Tuttle
Parent Typecomet
Best Hemispherenorthern
2017 Dates
Activity StartJul 17
Activity EndAug 24
Zirve TarihiAug 11
Moon PhaseWaning Gibbous
Moon Condition
very_poor
Best Timeafter_midnight
Characteristics
Popular
Summer Viewing
Fast Meteors
Persistent Trains
Bright Meteors