Category Archives: Astronomy

Just a touch past Full Moon tonight, moving past Jupiter, with a layer of high, thin clouds moving overhead. That means a 22º arc, with Jupiter just outside.

It’s been a nice holiday weekend. Now back to work.

Be kind to others. And to yourself.

On October 1st I had pictures from when the Moon was very close to Jupiter in the sky. It’s now 27 days later and Jupiter has moved a little bit toward the west. Meanwhile the Moon has gone all the way around, getting  in front of the sun two weeks ago in an annualar eclipse (partial here in LA) and now being back near Jupiter.

As before, the Moon is so bright that even at my DSLR’s fastest shutter speed (1/4000th second) it’s slightly washed out and overexposed. Meanwhile, Jupiter, in the lower right corner, can barely be seen at that exposure, despite being the fourth brightest object in the sky right now, behind the Sun, Moon,  and Venus.

How amazing is the human eye with its ability to clearly see the major details of the Moon, lava plains and huge craters and mountain ridges, while simultaneously seeing Jupiter clearly as the bright object it is.

Go take a look. Or tomorrow. (Assuming your sky is clear, of course. If you’re getting 12 inches of snow or it’s pouring rain, make snowballs or get inside!)

Yesterday was National Observe The Moon Night, an annual event around this time of year when the Moon is at or near First Quarter phase. That means it will be up high in the early evening and easy for folks to see without having to stay up late or get up early. There will be a nice terminator line to bring some contrast to craters, plains, and mountains.

But you can still observe the Moon tonight. Or tomorrow. Or any day you want. I encourage it!

Maybe you have a small telescope. Or even binoculars. Either will do a far better job of bringing out details than anything used by Galileo or Newton. Watch how the shadows change the view and appearance across the big craters from day to day.

Or you can just watch with the naked eye. Find a grassy spot or a lawn chair. Just lay there and watch for a few minutes every now and then. (Remember bug spray!)

And one of these days you’ll be able to watch and know that there are men and women living up there, the same way you can watch the ISS go overhead and know there are people living and working there.

Observe the Moon. One day it will be observing you back.

Shortly after 08:00 this morning the Moon began to move in front of the Sun, causing a partial solar eclipse as seen from here in Los Angeles. In other places, along a path from Oregon, directly over Albuquerque, into Texas, directly over San Antonio, into the Gulf of Mexico, over Central America, and over South America, folks got to see a “Ring of Fire” annular eclipse. NASA-TV had an excellent program covering it.

Here I made a simple attempt to photograph the progress of the eclipse. No fancy solar telescope, no H-alpha filters, just my 300 mm telephoto lens, a Canon xt DSLR on a tripod, and a handheld solar eclipse filter held in front of the lens.

09:45, a minute or two after maximum coverage in LA. The Moon has come in from the upper left and is moving down toward the lower left.

09:53 – the color of the Sun varies a bit depending on the length of the exposure. Even with the eclipse filter and the Sun’s disk partially obscured, the Sun is BRIGHT.

10:06 – For each set of pictures I was shooting a series of images, “bracketing” the exposures from 1/4000 second down to about 1/100 second. Then from each set I picked the best picture based on focus, exposure, and other factors.

10:26 – The dark film used to make the eclipse glasses isn’t optically flat, so taking pictures through it introduces a fair amount of blur. To truly do a nice job on this subject I would need a precision, optically flat glass filter, which can be a bit pricey. I’ll be looking at it for next year’s total eclipse, but not today.

10:45 – Getting close to the end of the eclipse.

10:54 – These last three images are just a minute apart as the eclipse was ending.

10:55 – Just the tiniest little sliver of the Moon’s edge is still covering 1% of the Sun’s disc in the lower left.

10:56 – Last contact

I hope that you got to see the eclipse today, or at least had (or will have) a chance to see it online. Now it’s time to start planning for next April 8th, the last full solar eclipse in North America this century.

I’ll see y’all in Texas! April 8th! Be there or be square!

The Moon is a day or three past full, and tonight it’s fairly close to Jupiter, which is quite bright. As bright as Jupiter is, it’s thousands of times dimmer than the 89% illuminated Moon. Which makes it challenging to get a picture of them together. Getting a picture of the Moon along with Jupiter and the Galilean moons is even tougher.

The Moon is easy enough to capture. In fact, with my Canon xTi and a Tamron 75-300 mm zoom lens, the biggest problem is that it’s almost TOO bright. That camera’s fastest exposure speed is 1/4000 second. This photo is at 1/2500 second, just two steps down.

Jupiter and its four Galilean moons are also easy enough to capture. From lower left to upper right, you can see Europa, Io, Ganymed, and Callisto. (If you ever look at Jupiter and want to know which one is which at that moment, go look at the “Jupiter’s Moons” page on the Sky & Telescope website.)

Trying to capture them both together, I took a full set of “bracketed” exposures, from 1/4000 second (where the Moon is fine, Jupiter is barely visible, and none of the Galilean moons can be seen at all) to 1 second (where the Moon is COMPLETELY overexposed but you can see Jupiter and the Galilean moons clearly). The best compromise is at about 1/1250 seconds, with the Moon overexposed and blurry but recognizeable and Jupiter just visible without any of its moons.

You might have to click on it to make it full-screen sized in order to see Jupiter on the far right.

What’s interesting is that as the Moon gets totally overexposed, the internal reflections of that super bright object start to show up like ghosts and they’re close enough to still being in focus to be recognized.

The real Moon is in the upper left, Jupiter and its moons on the right, and the internal reflection (the ghost Moon) is in the lower right. Not necessarily useful, but still cool and appropriate for October!