Archive for the 'photography' Category

Jul 18 2015

What does Pluto look like from Earth?

When I host star parties, one of the most enjoyable experiences is to introduce people to Saturn for the first time –  “Saturn Virgins” they are called.  People oooh! and ahhh! and walk around to the front of the telescope to see if I’m fooling them.  The can’t believe that the solar system appears with such 3 dimensional depth and reality.

This is inevitably followed up with “let’s look at the other planets.”   Jupiter is pretty cool, and occasionally shows moon shadows moving across it.  Mars and Venus can be very bright, but Neptune and Uranus are just small dots, barely discernable as disks instead of single dots (as stars look).

But Pluto is a different story.  Besides its demotion from planet to minor planet (a topic which generates immense debate, but which I’m firmly an agnostic), it is really far away.  It is only visible with light reflected from the sun.  The light from sun diminishes according to the inverse square law.  If a planet is 10 times as far from the sun as another, then it gets 1/100th the light.  But that is just the light falling on Pluto.  That light has to reflect and come back to Earth, which is another inverse square law relationship, which makes it an “inverse power of 4” law.  Moving a planet twice as far away makes it 1/16th as bright.   Pluto is very far away, as far as solar system metrics go.  It takes light about 4.5 hrs to go from Pluto to earth.  Kuiper Belt objects become very dim, very quickly.

I have a scale model of the solar system in my back yard.  I shrunk the sun to the size of a golf ball. To scale, Earth is then 12 feet away.  Pluto is 330 feet away.  This is seriously Far Away with Not Much In Between.   And the light we see from Pluto is Magnitude -14 – requiring a serious telescope to see.  Pluto is about 1 million times dimmer than Saturn.

Just before the New Horizons encounter with Pluto, I took some time lapse images of Pluto moving across the sky.  It was impossible for me to see the spacecraft, and even detecting Pluto was a challenge.  I set used my backyard observatory, the Cosmos Research Center, to photograph the sky around Pluto.  This is what I saw:



This image is about 1 degree wide, about as wide as your index finger held at arm’s length.  For those of you who can’t see Pluto yet, here is a close up, showing a zoom area around Pluto:


And for those of you who are still missing Pluto, here is a closeup showing the motion of Pluto over 4.5 hours – the same time that it takes for New Horizons to send information back to Earth.  Pluto’s motion is shown as a sequence of dots, making a thin line across the middle of the frame.  This shows were Pluto was when New Horizons sends a message (on the left), and where it is when we receive it (on the right).


And here is an animated image, showing the motion of Pluto over 4.5 hours.  Look in the center for the dot moving across the image.  If New Horizons sent a message while at the left most point in the motion, Earth would see it at the right most point.


And here is an interview I recorded with Dave Jewitt, the astronomer who discovered the first Kuiper Belt Object beyond Pluto.

I would like to thank Bill Warden, Orange County Astronomers,, for his help in processing these images.




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Feb 10 2009

Steve Wozniak and Dancing with the Stars

Published by under photography

The Woz in 1977

Steve Jobs (L) and Steve Wozniak in 1977. Probably the only photo of Jobs in a necktie.

Wozniak in 1977 announcing the Apple II

Steve Wozniak in 1977 announcing the Apple II

I’m amused that the Woz is going to appear on Dancing with the Stars.  Here are some pictures of him and Steve Jobs I took in 1977, the day that they announced the Apple II at the First West Coast Computer Faire.  The Woz is pretty much the geek’s geek, and has a great sense of humor.  But somehow, I just don’t see him as a great dancer.  Guess we’ll just have to see how he does.  I wouldn’t be surprised if he tries to automate his dance partner’s dress or something like that.

I spent about an hour and a half with Steve Jobs that day, talking about how he was going to compete with IBM and other amazingly grandiose things.  I went back up to Cupertino a few weeks later, but when I saw houses selling for $70,000, I decided going to work for them was out of the question (they had about 12 people in the company at the time).

These images and others are available for commercial licensing through Getty Images.


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Dec 19 2008

Wally Pacholka, Master Astro Photographer

Published by under photography

False Kiva in Canyonlands National Park

I just got some photos that I ordered from Wally Pacholka, an astro photographer who produces the most evocative images of the universe that I’ve ever seen.  Always including a terrestrial foreground, he manages to bring out the night sky against an intriguing foreground that connects our earth-bound vision with a love of the universe.  This image is a real photo, not a kluged-together photoshop project.

I’ve tried to shoot images like this, but somehow, it just doesn’t look the same.  Great work, Wally.


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Jun 01 2008

Gigapan- large scale panorama photography

Published by under photography

Copper Canyon PanoramaThanks to a tip from Charles Smith a while back, I’ve discovered the site, that helps folks post very large scale mosaics. It’s a fascinating process, and opens up a whole new way of doing photography. It also seems to be contagious. Three friends have seen my panos and have now begun their own exploration.

Above is a mosaic I took of the Copper Canyon in Northern Mexico last month. I shot 21 handheld individual photos, then stitched them together with Photoshop CS3. (using the Photomerge feature with both auto align and autoblend options turned on.)

I then saved the image as a TIFF, and uploaded it to Gigapan. Gigapan allows users to pan and zoom through the image, as well as take “snapshots” of the larger image.

This can take up a tremendous amount of compute time and memory. A 1 gb image can chew up 10gb of disk space while Photoshop is doing its magic.

Here are all of my panoramas


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