Andrew

A Changing Sky

Gazing up at the sky while reading the old texts one would not be amiss in believing that the stars never change. Indeed there are many who insist vehemently that the stars are eternal and unchanging. But the stars do indeed change, often quite visibly, sometimes within the span of a human lifetime.

VLT/SPHERE image of the star L2 Puppis and its surroundings — A VLT/SPHERE image of L² Puppis showing the enveloping cloud of gas and dust representing an early stage planetary nebula. Image credit ESO/P. Kervella used under Creative Commons 4.0

One such star is L₂ Puppis.

A bright star, one of the few naked eye variable stars that could be seen to fade and reappear without the aid of a telescope much like the far more famous stars Mira and Algol. On star charts the star is found prominently drawn at magnitude 4, buf if you attempt to locate it today you will not find it without the use of a telescope.

I first encountered this star quite recently while starhopping through southern Puppis with an 8″ telescope from the driveway. The chart showed two bright stars close together, L₁ Pup and L₂ Pup, while the view in the finder ‘scope showed only one bright star.

Solo Stars at Kaʻohe

The start of a dark night at Ka'ohe on the side of Mauna Kea — The start of a dark night at Kaʻohe on the side of Mauna Kea

Morning Observing

First quarter moon… Telescope time.

Observing Table — The observing table under red light.

I find myself reliably rising early, often around 4am, something that seemed to have begun during the pandemic. Those who knew me in my younger years may find this a bit unbeliveable, I used to hate mornings, but now?

The other factoid about island mornings. It is almost always clear. The afternoon and evening clouds have dissipated and clear skies are the rule.

Combine these bits with a love of the sky and the result is morning observing sessions, often half a dozen mornings will be spent out with a telescope in those couple weeks the Moon is absent from the morning sky.

Get up, shrug on some ratty old clothes, and wheel the telescope out of the garage. The ‘scope of choice is almost always the old Astrola, even with larger and more sophisticated telescopes available there is just something about using that old manual ‘scope that I find satisfying.

Perhaps the lack of computer or digital setting circles means it is my own skill enabling my path among the stars. The Astrola does have manual setting circles, but I rarely use those. A star chart, a finder, and starhopping allow me to wander through rather than jump about… I just see more, often stumbling across unexpected bits of beauty.

I have upgraded the Astrola a bit lately, adding a larger finder ‘scope with a wide field eyepiece. It is a 50mm 3D printed finder of my own design allowing me to see more sky at once with fainter stars.

There are a few more days until the bright Moon crosses into the morning sky, a few more mornings you will likely find me out with the ‘scope.

A Tool Rack

Building some small telescopes there are tools scattered across the workbench. Hex drivers are the most common tools on the bench to deal with the cap head socket screws I use for everything in my designs.

The hex drivers are supplied with a vinyl pouch. While a pouch may be a good solution for storing the tools, it is not a good solution for using the tools. I have to take out all of the drivers to find the one I want, invariably a small size buried under the bigger tools. The result is a scatter of tools across the bench and constantly trying to remember where I set down the one I need.

Sure, you can buy a nice little stand or rack, but they seem to be either cheaply made or expensive.

With a 3D printer available you see where this is going.

If you like what you see you can download the design at my place on Cults3D.

The design works very nicely, organizing the drivers where I can find them quickly and conveniently. Now to make a couple more racks for the small Wiha drivers I use for fine work and another for a set of larger screw drivers.

A Battery Caddy for the AM5

The ZWO AM5 telescope mount is a great piece of kit… It integrates very well with software allowing easy computer control, just click and go. The mount tracks wonderfully allowing excellent astrophotos. It is small, does not require a counterweight for smaller ‘scopes, and precise polar alignment is a breeze.

A 3D printed battery caddy on the side of a ZWO AM5 telescope mount

The mount is not without issues… Without a camera integrated into the system the GOTO accuracy is awful, using the mount as a visual mount is frustrating. You really need to have at least a guide camera and the ASI Air computer connected to allow to plate solving and automatic correction of the position at the end of each slew to a new target.

Another issue is that the mount has no concept of cord wrap. It will happily spin around and around as you wander across the sky. In equatorial mode this is not an issue, in alt-azimuth mode this runs the risk of damaging your equipment if you do not notice the power cord getting wrapped up on the mount in the dark.

Yes, I did that.

Awaiting Dark

A large dobsonian set up at Oregon Star Party 2023

Crabber

Stars over Lava

Eruption glow lights the caldera at Kilauea

Fissure East End

The erupting fissure stretched for nearly a mile across the down dropped block. This block is an enourmous slab of the old caldera floor, a mile across and wide, it had slumped down hundreds of feet during the 2018 Kilauea caldera collapse.

USGS reports had dubbed this slab the “down-dropped block” where it is routinely referred to in the daily reports of eruptive activity. The lower western edge had succumbed to the lava lake slowly filling the lower sections of the collapse pit where the edge of the block had become flooded by the growing lava lake.

This block had slumped down nearly intact, the top still flat, if now somewhat tilted to the west. The old features atop this block still visible including pahoehoe flows, old eruptive vents, and the hiking trail I had once hiked in crossing the caldera floor.

The old Halemaʻumaʻu Trail could still be seen as a lighter path beaten across the black lava by thousands of hiking boots. The trailhead was at the Halemaʻumaʻu parking lot, the pavement of that lot and sections of Crater Rim Drive still visible on smaller slump blocks on the west side of the caldera, also hundreds of feet below the original caldera floor.

The September 2023 eruption started as a fissure right across the down dropped block. For almost a mile fountains of lava surged and frothed. The down dropped block completely bisected by the eruption.

One small vent marked the end of the fissure, right at the eastern end where lava had forced its way through the pile of debris at the cliff that marked the block’s edge. Overlooked by most with far more spectacular fountains to be enjoyed. I found that last little vent fascinating where lava tumbled down through the talus.

I have not had a chance to look again, but I suspect this eruption finally covered over much of that section of the hiking trail. I wonder, one day when the caldera floor is filled by this series of eruptions if there will once again be trails out to cross the caldera, and if I will still be around to hike them.