Full Moon taken 27Aug2007, 90mm f/12 APO and Canon 20DaFull Moon will occur today at 16:50HST.
This full moon is a perigee full Moon, with the moment of lunar perigee occurring at 15:46, about an hour away from full moon. This full Moon will be a bit larger and a bit brighter than an average full moon.
Along with perigee, a total lunar eclipse will occur with this full Moon. Observers on either side of the Atlantic, including western Europe and the eastern seaboard of North America will be able to see the entire eclipse. Observers in Hawaii will only be able to see the last moments of the penumbral eclipse, not significant and not visually observable.
The NASA New Horizons team has released a gorgeous full disk image of Pluto. I would predict that this high resolution image will be the definitive image of Pluto for at least a century. Expect to see this image any time you run across Pluto in any media, from Wikipedia to school textbooks.
Panning across the image one can see that Pluto does feature a fair number of impact craters, more than I noted on the earlier images that often concentrated on the ice fields of the Sputnik Planum. This ice cap is startlingly smooth, with flow features visible, primarily at the margins. The ice is probably nitrogen ice as water is essentially a rock at these temperatures. Indeed much of the bedrock visible across the image is probably water ice.
The ice sheet is made up of polygons, a feature sometimes seen in ice here on Earth. For some reason the boundaries of the polygons are marked with long linear double depressions. These depressions look like 4WD roads across a desert of sand, if the vehicles had tires a mile across.
On the right side of the ice fields of Sputnik Planum there are a a large number of aeolian features, huge ridges one would suppose are aligned with the prevailing winds. Given that the image resolution is 0.8 miles per pixel these features must be miles high. These have recently been dubbed snakeskin terrain. I expect the planetary scientists will have a bit of fun trying to figure these out.
It is a beautiful image, conveying a great sense of what this dwarf planet is really like. Download the high resolution image and just wander. The larger image is bigger than WordPress will allow, use the link above to get the full size image.
NASA’s New Horizons spacecraft captured this high-resolution enhanced color view of Pluto on July 14, 2015. Credit: NASA/JHUAPL/SwRI
Fall equinox occurs today at 22:20HST. Today there will be little difference between the length of the night compared to number of daylight hours. This is the first day of fall as marked by many cultures in the northern hemisphere.
This year many calendars will mark September 23rd as the beginning of fall, and so it is for much of the world. Here in Hawaiʻi the equinox actually occurs on the 22nd when considering the time zone differences.
As the New Horizons data trickles back to Earth we are being treated to ever better images of this distant dwarf planet. Soaring mountains, glaciers of nitrogen ice flowing into ice caps that cover huge areas, a hazy and layered atmosphere, Pluto has turned out to be a surprise to just about every one. Those who expected an ancient cratered terrain have been presented with a surprisingly dynamic world.
Click on the image for more information, click again for the big version to really appreciate…
Pluto’s Majestic Mountains, Frozen Plains and Foggy Hazes: Just 15 minutes after its closest approach to Pluto on July 14, 2015. Credits: NASA/JHUAPL/SwRI
A six-inch f/5 telescope designed to allow maximum portability. A simple travel telescope that can go anywhere, small enough to fit in an airline carry-on bag while leaving room for clothing. Large enough to provide good views of celestial targets.
Makaʻiki under the stars for the first time at Hale Pōhaku on the side of Mauna Kea
I call the design Travel6, for obvious reasons. The actual telescope I have dubbed Makaʻiki, or simply “little eye” in Hawaiian. While 6″ may seem big to some, by the standards of amateur telescopes it is quite small. By the standards of the telescopes I work on it is downright miniscule.
Still, a 6″ telescope is quite capable in the right hands, able to give pleasing views of many celestial objects. The design is an RFT, or rich field telescope. A low power, wide angle eyepiece will result in a field rich in stars.
Like all good telescopes the design is based on ideas borrowed from other telescopes I have seen. In this case the basic design is from a very similar telescope by Brett Schaerer he named WikiKea, a telescope I had a chance to examine at Oregon Star Party a couple years ago. He incorporated a clever focus mechanism into that ‘scope that got my attention. This is a design I liked, I would have to build one for myself sometime.
Of course I had no plans for the ‘scope, just a couple photos. The first task was to draw up a complete set of plans, only then would I be able to understand all of the design issues. I have posted the full mechanical plans for the telescope at the link above. These plans should be enough for anyone with a little workshop savvy to duplicate the telescope.
The design shown could be notably simplified if one chose to do so. I have enough parts left over to build a second scope, and may consider a refined design the second time through based on the lessons of the first pass.
Active advisories for Sep 16, 2015. Tsunami, flash flooding or stormy seas, take your pick.This is getting downright ridiculous. Over the last few weeks we have had multiple flash floods, a few hurricanes wander by, and a tsunami come ashore. Admittedly none of the hurricanes have come directly in, missing the island. The tsunami was only about a meter and no damage has been reported. The flooding has caused some property damage and a lot of cleanup has been required. Aliʻi drive is a mess again as are several other roadways. An interesting summer.
It is not a hurricane watch, but rather a tsunami watch that is currently in effect for the island. This afternoon’s 8.3 magnitude earthquake in Chile may have generated a tsunami that may arrive around 3am tomorrow morning. The early data from stations along the Chilean coast report a tsunami has indeed occurred of between ½m and 3m in height. Oh the fun of living in paradise…
Update: Tsunami watch downgraded to an advisory, minor effects expected.
As I teenager I taught myself digital electronics. Working from the classic books of the day, mostly the TTL Cookbook, I built a succession of projects. Among these was my first clock. Unlike other projects, this clock was a kit from Jameco Electronics. It actually had a printed circuit board, a wooden case, and a red acrylic face. Not only did I get to solder a real circuit board for the first time, I learned every gate and flip-flop in the circuit. When I finished I knew how it worked.
A GPS observing clock or a bomb?I have built a few more clocks over the years, sometimes with classic seven segment LED displays. The latest was a GPS clock built in the 1990’s to provide accurate time on my observing table beside the telescope in the night. To a nerd like me the glowing LED displays are simply cool, something about this red glow contains a quality missing in the slick color LCD display of my modern phone or tablet computer.
On Monday this week a teenage high school student was arrested and interrogated by police for bringing a digital clock of his own construction to school. Like any young budding engineer Ahmed Mohamed wanted to show off his creation. Unfortunately the closed minds of MacArthur High School in Irvine Texas only saw a Muslim student with a possible bomb. It is clear someone has been watching way too much Fox News.
The most poignant part to me is Ahmed being led out of the school in handcuffs wearing a NASA t-shirt. In those photos I saw myself, a nerd in High School, doing the same things, starting on a road that would eventually lead me to an engineering job on the world’s most powerful telescopes.
A digital clock built by Ahmed Mohamed, photo released by the Irvine Texas police departmentFortunately the nationwide condemnation of the school administration and local police force has been swift and unforgiving. Social media has seized on this incident, the school’s Facebook page roiling with sharp criticism. Nationwide press articles have been equally unforgiving. Tech industry celebrities like Facebook’s Mark Zuckerberg have shown their support. Ahmed has even received a tweet and an invitation from the president…
Cool clock, Ahmed. Want to bring it to the White House? We should inspire more kids like you to like science. It’s what makes America great. – Tweet by President Barack Obama
It is gratifying to see that the message of many of these comments is that a young person building an electronic project is something to be celebrated, not feared. We should be encouraging students to experiment, to build, to learn. True engineers start this way, exploring technology for themselves, the experience gained can not be taught in a classroom. In my career I have met and worked closely with dozens of engineers, I can tell which ones were tinkerers and makers before they started college, who build and create for the sheer joy of it.
Ahmed is not sure if he will return to school immediately and the family is consulting with attorneys. Police are currently holding the clock as evidence. Thirty years later I still have my first clock.
