2020 Visibility Forecast
82
Visibility Score
17.9
Expected /hr
2.7%
Moon Illum.
excellent
82.8°
Best Alt.
at 20:00
Radiant Altitude & Hourly Rate (Peak Night)
Description
Medium strength shower with good rates for three nights around maximum. Can produce fireballs. Best from northern hemisphere at dawn.
History
One of oldest known showers, Chinese records from 687 BC. Comet Thatcher orbital period ~415 years.
Radiant Position
Shower Properties
IAU CodeLYR
ClassMajor Shower
ZHR18
Velocity49.0 km/s
Speed ClassMedium (30-50 km/s)
Pop. Index (r)2.1
Radiant RA271.0°
Radiant Dec+33.6°
Peak Sol. Lng.32.32°
Parent BodyC/1861 G1 (Thatcher)
Parent Typecomet
Best Hemispherenorthern
2020 Dates
Activity StartApr 14
Activity EndApr 30
Peak DateApr 21
Moon PhaseNew Moon
Moon Condition
excellent
Best Timepredawn
Characteristics
Moderate Rates