Andrew

Lagoon Region

Taking the AT6RC tube off and installing the Televue 76mm on the mount changes the game a bit. Lower magnification, wider field, a setup I find more appropriate for Waikoloa skies.

The average seeing in Waikoloa is 2 or 3 arcseconds, or worse… Not the 0.5 arseconds typical at the summit. This leads to mushy stars at higher magnification, fuzzballs rather than pinpoints. Lower magnification sidesteps this problem.

Still using the borrowed ASI2600MC color camera for a few more days, seeing just what it is capable of. The slightly larger sensor is nice and the data easier to process, but still I am seeing limitations that annoy me in the fine details. The color balance is difficult to deal with as well.

I will be going back to the ASI1600MM and filter wheel soon enough. I do need to up my processing game, the software side has changed substantially over the years and I need to transition. Will be giving PixInsight a spin over the next month.

The Lagoon Nebula Region including M8, M20, M23, NGC6544, IC 4678, Bochum 14, and much more

Of Green Stars…

Wandering the sky using a telescope and a field guide published in 1844, the better part of two centuries ago, is… uhhm… interesting. In mid-April the classic winter constellations are dissapearing into the sunset, with constellations like Monocerus and Puppis well placed for observing from my driveway just after dark. On my observing table is a reprint of that 1844 field guide, The Bedford Cycle.

Working through the entries I come to the entry for a double star Argo Navis 72 P. VIII, a designation from a very old catalog. It takes a few moments research to convert 72 P. VIII to the slightly more modern catalog number HD 71176. Modern? The Henry Draper Catalog was first published by Harvard Observatory in 1918, still over a century ago.

With the HD number I can look up the position on a modern chart and spend a few moments star-hopping the Astrola to the correct star. This double star is now located in the constellation Puppis after the ancient and absurdly large constellation Argo Navis was broken up into Puppis, Vela, and Carina.

Rainbow Falls

M3

M3 Globuar Cluster — The globular cluster M3

M67

Fiddlehead

The Lagoon in Hydrogen-Alpha

M8, The Lagoon Nebula taken in H-alpha light at 656nm

M42

The Beehive

Taking a Walk

A long weekend? Cloudy enough to preclude a night with a telescope? May as well take a walk.

There are a few great hikes around the island, but often I just do not feel like driving very far. Thus I head out to Puʻuhinai again, one of my favorite local hikes just outside the village.

Recent rains have turned the landscape green and lush. Everywhere there are signs of flowing water, even along many of the old ranch roads, the downpours have been intense lately. The mauna have had snow all year so far, a reminder of a very wet winter rainy season.