就是现在。狮子座流星雨。
Leonids
Active : November 14-21;Maximum : November 17, 8h 25mUT (sol = 235.27°);ZHR = 10-50+Radiant : alpha = 153°, delta = +22°;Radiant drift: see Table 6;V = 71 km/s;r = 2.9;TFC : alpha = 140°, delta = +35° and alpha = 129°, delta = +6° (beta>35° N); or alpha = 156°, delta = -3° and alpha = 129°, delta = +6° (beta<35° N);PFC : before 00h local time alpha = 120°, delta = +40° (beta>40° N); before 04h local time alpha = 120°, delta = +20° (beta>0° N); and after 04h local time alpha = 160°, delta = 0° (beta>0° N); before 04h local time alpha = 120°, delta = +10° (beta<0° N) and after 04h local time alpha = 160°, delta = -10° (beta<0° N).</PRE> |