Māmane

One of the most striking features of Mauna Kea is the māmane forest. These native trees are generally found from 5,000-9,000ft elevation on the slopes of the mountain. The māmane (Sophora chrysophylla) is highly variable in appearance, growing as a shrub or a tree, bearing bright yellow flowers in late winter months.

At around 8,000ft there is a fence built to keep feral sheep and cattle out of the māmane forest and to protect the endangered palila (Loxioides bailleui).  Above this fence the trees thrive, below the fence the forest is nearly dead.  The hillsides scattered with relic trees where no young trees survive the herbivores to replace them. While desolate in appearance these old trees can be quite photogenic.

Perseid Meteor Shower

Over the next few days the Perseid meteor shower will peak. As the most reliable shower each year this is also the most viewed meteor shower. Plentiful shooting stars combined with warm summer evenings makes this shower the easiest and most comfortable to view across much of the northern hemisphere.

The comfort of summer meteor observing marks quite a difference from the other reliable showers such as the Leonids and Quadrantids, that occur in November and January. Consider a warm summer night under a dark sky full of stars, a picnic blanket, relaxing while shooting stars streak across the sky. What could be better?

Leonids in Orion
A pair of Leonid meteors streak through Orion
The Perseid meteor shower occurs when the Earth passes through a stream of debris along the orbit of Comet Swift-Tuttle. This shower has been consistent throughout recorded history, mentioned in Chinese, Japanese and Korean records as early as the 1st century.

Active from July 17th to August 24th, the shower will build slowly for weeks before the peak. A week before or after peak the shower can still be seen with around 20 meteors each hour. With a radiant high in the constellation of Perseus this is a northern hemisphere shower, for southern observers the radiant never rises above the horizon.

Continue reading “Perseid Meteor Shower”

The Moon and Jupiter

This evening at sunset a nice crescent Moon and the bright planet Jupiter will be quite close. As sunset around 19:00 the two will be separated by a mere 46′, just a little over the width of the full Moon. The two should make a very attractive pair as they sit above the glow of sunset.

Keep an eye out for Mercury and Venus closer to the horizon. At 19:00 Venus will be 9° above the horizon with Mercury a bit higher at 14°. The Moon and Jupiter will be higher yet around 25°. Since Mars and Saturn are also visible in the southern sky all five naked eye planets will be visible.