双子座流星雨预报
Geminids (GEM)Active: December 7-17Maximum: December 14 5h10m UT (λo = 262°2) 2.3hZHR = 120Radiant: α = 112° δ = +33°Radiant drift: see Table 6v∞ = 35 km/s; r = 2.6TFC: α = 087° δ = +20° andα = 135° δ = +49° before 23h local timeα = 087° δ = +20° and α = 129° δ = +20° after 23h local time (β > 40° N)α = 120° δ = -03° and α = 084° δ = +10° (β < 40° N)IFC: α = 150° δ = +20° and α = 060° δ = +40° (β > 20° N)α = 135° δ = -05° and α = 080° δ = 00° (β < 20° N) ::070821_13.jpg::看看 谁能给解释一下，最好那两项数据应该怎么理解::070821_14.jpg::
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