2011 英仙座流星雨

英仙座流星雨極大期一般觀測

　　英仙座流星雨每年發生於7月17至8月14日之間，2011年的極大期預估將出現在8月13日1時50分至2時之間（臺灣標準時），估計的ZHRs註約為100。8月12日晚間英仙座的輻射點於21:30左右自東北方升起， 過了午夜到13日凌晨2點極大期時，輻射點已上升至東北方仰角近40度處。不過這個時候月球正在西南方天空，受月光影響觀測條件不佳。

(Posted Aug 05, 2011)August 12 and 13, 2011 Perseids

And when we say August 12 or 13, we mean the morning hours after midnight – not that night.
Unfortunately, the full moon will spoil 2011′s Perseid display, obscuring all but the brighter meteors,during the shower’s actual peak.
But you will see  Perseids in the weeks leading up to the peak, too, if you have dark skies.
These typically fast and bright meteors radiate from a point in the constellation Perseus the Hero.
You don’t need to know Perseus to watch the shower because the meteors appear in all parts of the sky.
The Perseids are considered by many people to be the year’s best shower, and often peak at 50 or more meteors per hour – in years when the moon is out of the sky.
However, 2011 is not a great year for the Perseids, because the moon is full on the expected peak date.
The Perseids tend to strengthen in number as late night deepens into midnight, and typically produce the most meteors in the wee hours before dawn.
These meteors are often bright and frequently leave persistent trains.

Start watching for the Perseids in the first week of August.
They will be building gradually to their peak.
By the second week of August, the moon will begin interfering with the skies between midnight and dawn.
On the mornings of August 12 and 13, you can still watch for some Perseid meteors to streak across this short summer night from midnight until dawn.
Yet the full moon will interfere.