2018 Visibility Forecast
70
Visibility Score
16.0
Expected /hr
43.0%
Moon Illum.
fair
83.0°
Best Alt.
at 20:00
Radiant Altitude & Hourly Rate (Peak Night)
Açıklama
Medium strength shower with good rates for three nights around maximum. Can produce fireballs. Best from northern hemisphere at dawn.
Geçmiş
One of oldest known showers, Chinese records from 687 BC. Comet Thatcher orbital period ~415 years.
Radiant Position
Shower Properties
IAU CodeLYR
ClassMajor Shower
ZSH18
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°
Ana CisimC/1861 G1 (Thatcher)
Parent Typecomet
Best Hemispherenorthern
2018 Dates
Activity StartApr 14
Activity EndApr 30
Zirve TarihiApr 22
Moon PhaseFirst Quarter
Moon Condition
fair
Best Timepredawn
Characteristics
Moderate Rates