Changed out my theme here and I’ve got a bunch of little bugs and formatting to clear up. Since I’ve been tweaking and reviewing I see many text format issues with past posts. Can’t blame that on the theme change, that happened when I migrated to this hosting provider a year ago. Just never noticed until now.
There was an exceptionally dry air mass sitting over the region. So dry the next day as we setup the field the temperature shot up to the low 90s with a relative humidity of 14%. Desert like conditions, I couldn’t drink enough water. Friday night was pretty good, almost like Thursday but with a few more clouds, black shapes in the sky, floating through getting thicker after midnight.
Peak star party: a field full of amateur astronomers, deep sky observers, astrophotographers and simply lovers of the night sky. Several hundred people.
This was Monday night, October 18th, our first all night clear sky for the 2017 Okie-Tex star party. Just before darkness I got into position. During the day I chose a spot to get the entire star party field. About the start of astronomical darkness I started a series of photos to build the panorama above. Click the image for a bigger version.
Technically it was our third night of the star party. Really it was the first good night as Saturday was cut short with clouds and most people are tired from traveling that day. Sunday night we got smacked with rain, hail and wind after watching a tremendous display of cloud to cloud lightning to our NNW. So as darkness fell Monday night you could feel the excitement for a good clear night on the field.
Surprisingly (to me) this is my first nightscape panorama. Its made from two rows of six exposures each 30 seconds long, landscape orientation with a 14mm lens. I didn’t get the coverage exactly right, lost track of my count on the second row. So the top very right corner I had to fill in. I should have taken a few more shots to ensure proper overlap, need to execute a bit better. This image isn’t perfect, likely I’ll tweak it a bit but overall I’m pretty happy with it.
Tonight the moon is full. Earth is located exactly between the moon and the sun (ok technically that precise moment for my location is 4:06 CDT tomorrow morning). In 44 days, the the moon will be between the sun and Earth and at exactly 13:05 CDT the moons shadow will be just north of me. I will be somewhere in that shadow.
Whats interesting about the full moon is that the night sky during full moon is reportedly how dark the daytime sky will get if one is standing in the path of totality during a solar eclipse. I don’t know since I’ve never experienced the wonder of totality. Clearly the horizon during totality will appear more like sunset. But what is the naked eye limiting magnitude (NELM) during totality?
Only way to find out is to be in the path of totality in 44 days. I’ll have my sqm with. Incidentally the NELM with a full moon was 4.3 at 23:40.
Last week as true darkness started I wandered my backyard in awe and wonderment. All around me were fireflies flashing. They floated by my head the close flash incredibly bright. Those near the ground would momentarily create a circle of greenish light. They were everywhere. Some near the ground, some up high in the trees, most floating a few feet above the ground in the still air. At least a hundred blinking lights. Truly a magical night. I knew then I’m at peak firefly.
Every night for the past ten days I’ve been out watching the little bugs. The timing has been great this year with the moon now days past full, a waning crescent. Observing fireflies isn’t something I just started as I’ve been seriously doing it for years. I’ve even tried photography several times. But my local light pollution and perhaps lack of skill, or maybe poor technique, haven’t yielded good results. Its really difficult to capture that special feeling be around hundreds of fireflies
I have learned a great number of things about fireflies over the years. That each species flashes in a unique way. That they are out to mate and will die after their light show is done. That the males are flying around and the females sit waiting to chose the right one.
Perhaps most interesting to me is that a peak period of activity happens. That is, for a short time, perhaps a week or two, the greatest number of fireflies are active. For my location its roughly this time of year ever year. And then they will get less and less as the days pass. Certainly there will be some fireflies flashing in my backyard a few months from now. Just as their were a few flashing two months earlier. But nothing like the numbers I have now. Peak firefly, week of the lightning bug, seems like their should be a name for it.
Fireflies come out well before the sun sets and get ready for their nightly show. If one looks around you’ll see them waiting on tall grass or perched on bush like this guy from my yard last July:
I read that firefly numbers are going down which does not surprise me at all. Between light pollution and lawn maintenance chemicals I’d bet their numbers in suburbia, where I grew up many years ago, are greatly reduced. None of that is present where I am now. I also border a wet wooded area: perfect habitat for fireflies. Even with good living conditions their numbers do vary from year to year. In particular around the 2011 drought period here the firefly activity was significantly less.
And this is something I’ve wondered for years: how do I get an accurate count of the fireflies active in a given area at that time? Maybe accurate isn’t the right word. Maybe quantifiable is a better one. Fireflies per cubic meter / per second? I have observed variations from year to year and would like to be able to compare numbers rather than a gut feeling I have that there are more or less fireflies.
Even if I never figure out how to properly count their quantity or get a stunning picture that truly reflects what I am seeing, I consider myself lucky I get a lovely show every year.
Fifteen minutes past the start of 2017 the sky is clear. All was quiet following the barrage of noise at midnight. My equipment runs flawlessly in the crisp 23? (-5?) air. Blue light from neighbors holiday display illuminates the telescope tube (click for larger version):
Fantastic way to start the new year!
This will be a great year for visual astronomy here in the United States. Unlike 2016 many meteor showers have favorable conditions. The Quadrantids, Lyrids, Orionids, Leonids and best of all the Geminids are all relatively free of moonlight interference. Only the Perseids are affected this year.
The Total Solar Eclipse of 2017
The biggest astronomy event of 2017 is 231 days from now. On August 21, 2017 the moon will pass in front of the sun and its shadow will race across the United States from Oregon to South Carolina. There hasn’t been a solar eclipse where the path of totality crossed the United States in almost 100 years.
This is an event you don’t want to miss and you must be in the path of totality. This narrow strip, just 70 miles wide, is where day will turn to near darkness for a few minutes. Where you will see the incredible beauty of the sun’s corona. No video camera can capture the true spectacle of this event. You must be there!
Tonight we shift back to standard time. In a few months when we start the Dumb Shift of Time (DST) think about this: