Category: Photos

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With any luck I’ll finally post about last week’s trip to Las Vegas soon, but meanwhile, here’s something interesting that we spotted a couple of times on the drive back: The shadow of a contrail against the sky.

Here’s what it looked like, as the camera saw it. Actually, it was much more visible at the start. It faded considerably in the time it took to get the camera out and snap the photo.

Contrail and shadow, unprocessed

And here it is with the contrast enhanced. You can see a dark line extending across the sky from the end of the trail down to the lower left. The sun was at the upper right, almost but not quite in line with the trail at that point.

Contrail and shadow, with contrast enhanced

Atmospheric Optics has a huge collection of cloud shadows, rays, rainbows, ice halos, and more, including a diagram of how contrail shadows work.

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On Sunday, March 11, a brush fire struck in the Anaheim Hills area. It was controlled relatively quickly, and by the next morning, the smoke had settled into a blanket of haze over Orange County.

Layer of haze in front of hills

For contrast, here’s a shot from a few weeks earlier (February 23), when it was unusually clear. This was taken from a park in the Quail Hill area of Irvine, looking across the Saddleback Valley from the south toward the same range of hills seen on the left of the picture above.

Quail Hill View

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I walked out the front door last night around 5:50 to pick up the mail, and immediately walked back in to get the camera, because this is what I saw:

Crescent moon and Venus

My parents gave me a flexible mini-tripod for Christmas, and it proved very helpful here, as there was nowhere flat where I could set the camera and still get a good view. I ended up coiling it around a stair railing, which held the camera in place long enough to get a decent exposure.

I seriously thought about pulling my SLR camera out of the closet and seeing whether I had any film for it, but ultimately decided against it.

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Well, I tried again at lunch to see if I could spot Comet McNaughton during the day, just in case it was still bright enough. No luck, but I set my camera on max zoom and took a set of pictures in roughly the right area, just to see if I could spot something.

And, well, I did. I’m just not sure what. This was 1:28 pm (33.66 N, 117.75 W), looking roughly southwest, with the sun placed behind a wall to the right. The sun is to the right and above the frame. I don’t have a good sense of distance in the sky, but this is in the right direction to be either Venus or the comet.

Or it could be a passing high-altitude airplane that I didn’t notice.

If it is the comet, the tail is completely invisible, as it should be stretching down to the lower left (away from the sun) and I can’t make anything like that appear with any of the image enhancement tools I’ve tried.

Small bright object in the daytime sky.

This is unprocessed. All I did was load it from the camera and crop it. And here’s a copy of the whole photo (this was at full ~3x zoom on a Canon PowerShot SD600) with the position of the object and the rough position of the sun pointed out.

Position of the unidentified object

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The skies were surprisingly clear today. Four of us at work walked outside after sunset to a bridge near the office, and saw Comet McNaught. It was visible from ~5:10/5:15 to 5:28, at which point it slipped below the line of hills to the west.

We saw it against the red sky, slowly dropping through the (fortunately sparse) clouds. It was easily visible to the naked eye as a fuzzy white spot, with a hint of a tail pointing straight up that was a lot clearer in binoculars. The tail looked like a U or a V, fanning out at what looked like (but probably wasn’t) a 45° angle.

Well, my fingers are finally warming up. (I made the mistake of not grabbing my jacket, and went out just in my sweater.) Time to wrap stuff up.

Update January 13: I managed to catch another glimpse of it tonight. Unfortunately I was just arriving at the shop to pick up my car, and it was just closing, so I didn’t have a chance to watch it set (or see much more than a fuzzy white dot.) My watch said 5:02. By the time I got out, it had set beneath the building across the street, and there just wasn’t anywhere nearby enough with a clearer view of the western horizon.

On the plus side, I did manage to spot Venus while the sky was still light, and get a picture. It’s not quite as exciting as spotting it at one in the afternoon, but by adding more blue, you get an idea of what that looked like:
Venus in a light sky: actual on the left, colorized on the right

Update January 14:

I was looking over the photos I took last night (Saturday) and discovered I could actually find it by messing around with levels. On the left is the original photo, with a little bit of color correction to match what the sky looked like. The background’s still too bright to see the comet, though it was visible to the eye. On the right, I’ve adjusted the heck out of the image, and there’s a very slight bright spot right where it should be (I framed the shot so that the comet would be near the light pole, making it easier to find). Actually, now that I look at it again, it’s just barely visible in the less-processed photo on the left.
Comet McNaught - original photo on the left, processed on the right.

Also, this is cool: the comet has gotten bright enough to be spotted in daylight. (via Slashdot) I didn’t have any luck looking for it this afternoon, but I chalk that up to lower altitude and city haze.

Update January 15: I spotted something today, but I’m not sure what…

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I set up a slide-show screen saver on one of my computers at work. To start, I dropped in some of my wallpapers, including several from the Astronomy Picture of the Day, then snagged some photos from my website to add a little variety.

Of course, 800×600 (or smaller) images don’t look so great blown up to 1400×1050, so last weekend I grabbed some higher-res copies from home.

What surprised me was how blurry the older photos were. Most of the digital photos I have older than 2003 are scanned in from 3½×5″ or 4×6″ prints. And half of those were done with a point and shoot camera. Even the photos that I scanned at a higher resolution tended to be much blurrier than the 5-megapixel images I’ve been taking since we went digital.

It also pointed up a problem with the point-and-shoot camera and lighting. Compare the following photos from my American Southwest page:

Moon over Springdale, Utah (SLR) Looking Back at Laughlin

The one on the left (of the moon above a rock ridge) was taken with an old SLR camera that my grandfather gave me when I was maybe 12 or so. It was entirely manual except for a built-in light meter. I loved the control and the photo quality I could get out of it, but it was big and bulky, and eventually I stopped carrying it.

The second photo (with the one tall building sticking up out of nowhere) was taken with the point-and-shoot camera I picked up during high school and used right up through that first Hawaii trip. Notice the difference in the sky? The sky does vary in color—you only need to walk outside on a clear day to see that—but something about that camera just collected less light from the corners of the image. The Laughlin picture is a good example because you can see the circle continue across the lower half of the frame as well.

The ones from the 2003 Hawaii trip are actually not too bad, even though they were done on the cheap camera, because they were scanned straight from the negatives by Kodak. I suspect they have a slightly better scanner than I do! 😀