Segment
Petroglyph
Mercury Appears in the Dawn
The planet Mercury is starting a morning apparition. The planet should become visible this week just above the dawn as a magnitude -1 object. The planet is moving more than 1° further from the Sun and higher in the morning sky each day, reaching a maximum elongation of 18° on October 15th.
Trail Through the Lava
A well made trail across the 1856 lava flow, allowing an easy crossing through the aʻa. Too well made, not something built by the State of Hawaii, this is older, much older. One feature of the old trails was large flat stones laid along the path. I suspect the trail was cut soon after the lava flow cooled, reconnecting the villages along this section of the Kohala coast.
Coral Bleaching on the Kohala Coast
I had been hearing it was bad, I really did not know how bad.
It is pretty bad.
The warm waters have been hard on our local corals. Nearly all of the cauliflower coral (Pocillopora meandrina) is completely white, completely bleached. The encrusting lobe and finger coral (Porites lobata) was better, but some colonies were looking a little lighter in color than I would like to see. Some of the other lobe corals (Porites evermanni) were also bleaching.
As we were snorkeling in a fairly shallow bay this could be a worst case sampling of the coastline. I hope so, it was distressing to see the reef under such stress. The water was warm, far warmer than I ever remember in my eight years on island.
The current El Nino event is forecast to last through the end of the year. It will be interesting to see if the corals recover, and how much of the colonies will die. I will have to make a point to swim the same section of reef a few more time as the fall turns to winter. I should swim to the same bit of reef and take a few more photos.
Mauna Kea Looms
Mercury at Inferior Conjunction
Today the planet Mercury passes through inferior conjunction, passing between the Sun and the Earth. In a week or so the planet will again be visible in the dawn sky, climbing higher each day. Maximum elongation will occur October 16th.
Queen’s Bath
“We swam in the Queen’s Bath this weekend”
“Oh? Which one?”
There is the well known lava tube at Kihilo just a pebble’s throw from the surf. Enter through a skylight into the crisp, cool water. Bring a dive light and swim all the way to the back of the tube. Careful, there are boulders waiting to scrape the shins of an unwary swimmer, reef shoes or river sandals are the ideal footwear here.
Another Queen’s bath is found on the grounds of the Kaloko-Honokōhau National Historic Park. The park requests that you refrain from swimming in this one.
There are any number of pools along the Kohala Coast, particularly the low-lying section from Puako to Kiholo bay where enormous amounts of fresh water find their way into the sea. These often have reef fish trapped within, perhaps washed in by the winter surf. Other species of fish prefer these pools, grazing on the algae growing in the shallow, warm water.
Some of these pools are brackish, the salt water mixing with fresh. The result is a swirling view through a dive mask with the mixed refractive indexes, looking a bit like mixing water and oil. As one swims away from the ocean the water becomes fresher, you often find startlingly cool currents where the fresh water enters the pool. Often the tides will affect the depth of the water in the pool, even pools a hundred yards from the ocean rising and falling as the tide backs up the flow of water.
Many of the pools are local secrets, directions not available to outsiders. Places where a hot afternoon can be enjoyed, swimming in the cool waters. I know a few of these, don’t ask me where to find them.
No Moon in the Shadow
I had planned to go up and photograph the tail end of tonight’s eclipse as the full Moon rose just inside the mountain shadow… No luck.
Thanks to tropical storm Niala passing south of the island the summit is totally weathered in. Fog, rain and no shadows…
A Star Party for WHEA
They got lucky.
We try anyway.
WHEA, or West Hawaii Explorations Academy is a charter school located in the NELHA complex just north of Kona and just south of the airport. They concentrate on science, mostly marine science, with an outdoor hands-on curricula. Large pavilions serve as additional classrooms. The campus is littered with evidence of various projects, from large pools, various gardens, and a phalanx of handmade cargo pallet catapults in the back.
There were some clouds to hamper us, but nothing that would obscure the view for more than a minute or two. A nearly full moon, just a few days shy of this week’s eclipse, was beautiful in the telescope. We also had Saturn, still available in the evening sky at the head of Scorpio. As the evening passed so did the clouds, thinning to a few wisps across the sky.
Maureen was there with her big dob. Chris and Doris with the C-14, Brad with his twin refractor that shows the Moon beautifully. Cliff set up the C-11 giving us five telescopes in all, plenty of eyepieces to supply visions to waiting eyes. I need to spend a little time working on our NextStar GPS 11″, the motor control issue is back, I was running in manual mode much of the evening.
We gazed at the terrain of the Moon and I showed kids, and a few teachers, how to take photos with a cell phone through the eyepiece. A good school star party and a well spent Friday evening. Even if it did take half an hour for the security guard to arrive to open the gate and let us leave. There were also too many chocolate chip cookies available.