The Half-Astrophysicist Blog

Seeing in the Infrared: The Seek Thermal Camera

I have neglected this blog for a while, but vow to do better! And I have a really fun entry today.

Infrared cameras have been around a long time but have always been very expensive. Even a low cost Flir camera starts at about $1000. I have had the opportunity to borrow infrared cameras for work and have always enjoyed playing with them and wanted one for myself.

Earlier this year, Seek Thermal announced a new camera that attaches to your cell phone (both Android and IOS) for $200. It looked promising and I decided to take a chance and order one from Amazon.

The first thing I will say it it took a while. They were overwhelmed with orders and it was backordered for several weeks. Part of the reason I ordered from Amazon is they won’t charge you credit card until the product ships (some people complained they ordered from Seek directly and their credit cards were immediately charged even though the camera was backordered).

My camera finally arrived on Monday. I downloaded the app for my cell phone (free), plugged in the camera and it took right off giving me infrared images. As you can imagine, the first thing you do is take a selfie.

img_thermal-1107409294You can clearly see warmer and cooler parts of my face. It’s hard to take a selfie since the camera points away from you! The resolution of the camera is pretty low…only about 32,000 pixels (compare to many megapixels for modern cameras). However, that is normal for infrared cameras to have a much lower resolution and some of the entry level Flilr cameras have resolutions of under 5,000 pixels (such as the Flir E4 which starts at $995) so I would say they are doing pretty good for the price point.

When I got home, of course the cats were instantly the subject of pics. They both have cold noses.

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A picture of my television and entertainment center. I believe you can tell where the LCDs are located behind the screen from the heat signature. The big heat source beneath the television is my stereo receiver and the DVR is on the shelf below that.

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I went outside. The camera works in the dark of course since it detects infrared instead of visible light. You can tell the difference between the lower level of my townhouse which is exposed brick versus the second story that has siding.

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Last night I went to Jersey Mike’s subs here in Tucson since I didn’t have time to go home for dinner. Couldn’t resist snapping a photo of the grill. I believe that is meat for cheesesteaks on the grill. Looks like the one on the left will be done first!

img_thermal-745333136I have been playing with it. I have managed to see footprints in the infrared and can tell if someone has been sitting in a chair recently. You can also use the camera to measure temperatures of objects. I have used this feature but not done any testing to see how accurate the readings are.

Two minor issues with the camera. I find that if you bump the camera while it is plugged in, it is easy to jostle it enough for the software to lose contact with it. It always finds the camera again quickly so that is not a major issue. The second issue is a software nag. When you plug the camera in, a pop up window appears and asks if you want to allow the phone to access the camera. There is a little box you can check that says always allow this connection. I check that box but it always shows up again and asks the same question every time I connect the camera. Hopefully this will be fixed in a future software release.

The camera will record video as well. However, the refresh rate is only 9Hz so the video will not be very smooth. Again, I have found this true even with the $1000 (or more) IR cameras so you have to pony up a pretty penny to get around this!

Overall, my first impressions are positive andI hope to play with it for a long time! I will take it with me when observing/photographing outside so I have something to entertain myself with while my camera clicks away.

The other issues I should mention is with the iPhone version. According to Seek’s facebook page, Apple has not approved it for use with the iPhone so shipments of the iPhone model are on hold currently and people waiting for that version are not happy. It looks like they are almost caught up with the backlog of orders for the Android version.

You definitely can’t beat the price…this is the first time a decent IR camera has been available at this cost and I look forward to seeing what people can do with it!

November 19, 2014 Posted by | Uncategorized | Leave a comment

Venus and Neptune

I love taking pretty astro photos as much as the next person. However, I also enjoy taking shots that may not be as visually appealing but that show an interesting phenomena.

One such opportunity arose as the planets Venus and Neptune had a close conjunction on April 12th. At closest approach, they were only 40 arc minutes (2/3 of a degree) apart. They would have been a little farther apart by the time they rose in Tucson that morning, but still pretty close. Unfortunately, the morning of the 12th was cloud so I had to wait for the clouds to break. This morning (the 13th) was nice and clear when my alarm went off. According to Stellarium, they would be about 1 degree, 32 arc minutes apart when I went out this morning.

Again, I fired up the trusty Canon 60D with the 75-300mm zoom lens at 300mm. I didn’t bother with the Skytracker as I figured I should be able to get the pair with a fairly short exposure. I took quite a few shots, but my favorite ended up being a 2 second exposure at ISO5000 (which showed the mountains faintly in the foreground). I put an arrow to help you find Neptune.

Venus-Neptune

 

The star immediately above Neptune is HIP111398 and the two brighter stars to the right are sigma Aquarius (top) and 58 Aquarius (bottom) for those trying to get oriented in the sky.

Although they appear close together in the sky, they are far apart. Venus is a mere 78 million miles away and Neptune is 2.85 billion miles away! Light takes about 7 minutes to reach us from Venus but about 4 hours and 12 minutes to arrive from Neptune! Neptune’s diameter is about twice that of Venus, but is appears dim since it is so far away and receives much less sunlight than Venus.

If you have similar equipment to mine, you can go out and try to get your own photograph of a nearby planet and a distant planet in the same shot for the next few days.

April 13, 2014 Posted by | Astrophotography, Conjunctions, Neptune, Venus | , | 1 Comment

A Night On Kitt Peak

Last night I was fortunate enough to accompany a U of Arizona student on a trip up Kitt Peak. He was trying to observe an exoplanet transit with the 0.9 meter telescope (he got data…has to analyze it to see if he saw the planet). We also took some pretty pictures (again, pending analysis) with the telescope.

Fortunately, there were times I could sneak outside with my camera and take some pics. The Moon was waxing gibbous so it’s light would dominate until it set. Fortunately, there are still interesting things you can photograph. Mars was at opposition last night so I took a couple of pictures of Mars and Spica as they rose over the domes.

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As twilight ended, I setup  for a shot I have wanted to do for a long time. I walked down to the McMath-Pierce Solar Telescope. This famous telescope looks like the number 7 on its side. It is polar aligned which means that the tunnel points straight toward the north star (less than half the tunnel is above ground…it’s really a cool scope!) I set up my camera at the base of the telescope where the tunnel went underground and set my intervalometer to take a whole bunch of 30 second exposures which I then stacked to produce the star trails shown below. The one star at the tip of the telescope that stays still is the North Star.

McMath-Pierce Star TrailsI then went back to the 0.9 meter scope and setup  for a star trails shot pointing toward the 4 meter telescope. Some clouds started rolling in and I stopped after a while thinking my photo wouldn’t come out. I processed it anyway and the moving clouds created an interesting image. Maybe I should have kept taking more images to make the trails longer!

Star Trails over 4 meter clouds

Did some visual observing for a while and then after the Moon set, went for some images of the Milky Way rising.

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Great night, but got very little sleep…say, that sounds like a good idea.

 

 

 

 

April 10, 2014 Posted by | Astrophotography, Pretty Pictures | | 3 Comments

The Zodiacal Light and Some Other Things

Last night I was at a star party in very rural Arizona where it is very dark. I didn’t have a lot of time for photography, but I had to get the Zodiacal Light after sunset.

Zodiacal LightThat nice vertical pillar of white is the Zodiacal Light. The Zodiacal Light is caused by sunlight reflecting off of dust in the plane of our solar system. Since this dust is in the plane of our solar system, it shows up along the ecliptic (or Zodiac). The ecliptic is almost vertical with respect to the horizon at sunset for people in the northern hemisphere at this time of year so the light really stands out.

But there are some other interesting things in this image. The Pleaides stand out near the top and above the pole on the right you can see the faint smudge that is the Andromeda Galaxy. In the middle of the image about 2/3 of the way up is a small streak. I checked for satellites in the area and there now no bright passes (or Iridium flares) so this is probably a meteor. At the bottom you can see a curved line. That is clearly a jet (I sat it naked eye as well) probably training at the Yuma Proving Grounds.

I was just going to post this on flickr (which I did) and wasn’t planning on a blog entry until I did a little closer inspection and started realizing all the other stuff that I captured.

February 27, 2014 Posted by | Astrophotography, Zodiacal Light | | Leave a comment

Two Morning Comets

The comets from last fall have been fading, but they are not gone. Last week, two of them had a fairly close encounter in the morning sky. On February 6th, Comets Lovejoy and Linear (X1) were just two degrees apart. Unfortunately, cloudy mornings ruled in Tucson for a while before and after that.

I finally got my break Sunday morning. Looking outside at 4:30am, it was clear so I grabbed my camera and headed to my dark site. The comets were fainter, but easily visible in my pics.

IMG_0169-2Comet Lovejoy is the upper blue blob and LINEAR is the blue fuzzy patch near the bottom center of the screen. At the very left of the frame is the open cluster NGC6633. I used my Canon 60D with 75-300mm zoom lens at 300mm, f/5.6, 120sec exposure at ISO5000 on an iOptron Skytracker. In other words, my usual setup.

These comets are still visible but moving farther apart. Universe today has a nice article on how to find them if you want to check them out.

February 12, 2014 Posted by | Astrophotography, Comet Lovejoy, Comets | , | Leave a comment

The Crescent Moon and Uranus

I like taking unusual pictures sometimes. They aren’t always the most spectacular shots, but they show off unusual conjunctions that may happen fairly often but are rarely photographed.

Tonight’s shot that falls into that category is the Moon and Uranus. I didn’t think I was going to get a chance at this on as it was raining in the early part of the evening. By chance I happened to be outside around 9pm and it had cleared so I grabbed the camera and went for it. The following shot was taken with my Canon60D, EF 75-300mm lens at 220mm and f/5.6, 0.5 second exposure at ISO3200. I fired up Stellarium to verify which of the fainter objects was Uranus and put a little line pointing to it (and it took forever since my computer with Lightroom and Photoshop had a hard drive crash and I am currently waiting for replacement parts I had to use alternate photo processing programs…don’t worry…a good backup exists!)

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In October, we will have a totally eclipsed Moon very close to the planet Uranus. I look forward to capturing this pair at that time, clouds willing!

 

February 4, 2014 Posted by | Astrophotography, Conjunctions, Moon, Uranus | | Leave a comment

Supernova in M82

I have been busy and not had as much time to do any astrophotography recently. Fortunately, I had some good luck and timing yesterday.

Wednesday morning, I woke up to news of a supernova in M82. Fortunately, I saw this before I went to work. I was scheduled to work with some students at Tohono O’odham Commuity College in Sells last night and thought I might get a chance to try to catch the supernova from there. The college site is nice and dark so it was worth a shot throwing my equipment in the car. Fortune also smiled with clear skies when I got out there.

I was using my Canon 60D, EF 75-300mm zoom lens and iOptron Skytracker, my usual setup. Although there are people with larger, better setups out there that will no doubt take more spectacular pics, I can at least purse the record for the person who imaged the supernova with the smallest setup!

I took some pics of M82 and the nearby galaxy M81 a few weeks ago before the supernova. Here is one of those pics. I took this one on Christmas Eve and believe I used my 250mm lens so the scale is a little different.

11543164176_f1aedfb94c_oOkay, now here is the one from last night. The two lines point to the new little point of light that is the supernova (I did not crop the pics the same and they were taken with slightly different lenses so the scale is different). Click the images for larger versions.

12103271733_0d5c3c8542_oHopefully you can see the new little dot of light. It’s position matches up with the position of the supernova.

This supernova is interesting for many reasons. First, M82 is undergoing a rapid burst of star formation due to a recent pass by the nearby galaxy M81 (also seen in the pic). Increased rates of star formation lead to higher rates of supernova. Second, M82 is a relatively nearby galaxy (only 12 million light years away or so) which means we can study it in greater detail than more distant supernova.

Finally, this is a type 1a supernova. Type 1a supernova form when a white dwarf star sucks matter off a nearby companion star. White dwarfs have a maximum mass about 1.4 times the mass of our Sun. If you add more matter than that, you get a huge explosion which destroys the star. This white dwarf suffered that fate leading to the supernova we are now observing.

Since type 1a supernova always happen when the mass hits 1.4 times that of our Sun, they are always about the same brightness. If you know the brightness of an object, you can figure out its distance. Type 1a supernova are very bright and can be seen in distant galaxies and are very important for astronomers to determine the distance to other galaxies. The more we can study nearby ones, the better we understand them and the better we can measure the distances to other galaxies. Therefore, astronomers are training lots of scopes on this supernova right now!

Oh, I got so excited about the pics, I should mention that we saw it visually as well. We were using a 6″ Celestron Nexstar SE and could see a little bright spot in the galaxy right where the supernova is. I am always nervous showing objects like this to people as you sometimes get the disappointed “Is that it?” reaction. The students last night, however, were happy to be able to see it and I didn’t have to deal with that common reaction. So I can tell you it is visible with a 6″ or larger scope…wouldn’t surprise me if people spot it with even smaller scopes.

This supernova looks like it was discovered before peak brightness. It will probably get brighter for another week or two before starting to fade. How much brighter is an open question and hard to predict. We don’t know how long it took after the explosion for us to discover the supernova (several pre-discovery images have already turned up) and there may be intervening dust that dims the supernova. Worst case scenario, it will not get worse for a week or two. Best case scenario, it brightens another couple of magnitudes.

My sympathies to the northerners who have to brave the cold to see it…I was out in just a sweatshirt last night!

January 23, 2014 Posted by | Astrophotography, Galaxies, Supernova | , | 1 Comment

Saguaro Star Trails

Just a quick star trails shot I did last night…well, if you can call 43 minutes quick. This is 103 exposures of 25 seconds each put together with StarStax to create this image from Saguaro National Park east in Tucson. I used my Canon 60D and Tokina 11-16mm f/2.8 lens at 11mm and f/2.8. I wanted the saguaros in the foreground. I didn’t center on polaris since the farther west I pointed, the more the lights of Tucson interfered. Hope you like it.

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December 27, 2013 Posted by | Astrophotography, Star Trails | , | Leave a comment

Hunting the Horsehead

When I was in grade school and first getting into astronomy, the Horsehead Nebula was one of the most intriguing objects in the sky. It was on the top of the list of things I wanted to see. When I got my first little 60mm refracting telescope, I spend hours scanning Orion looking for it, never finding it…and of course never listening to people who told me (correctly) that it was WAY beyond the reach of a 60mm telescope!

Earlier this week, I had the pleasure of going out on a shoot with an excellent astrophotographer, Sean Parker (if you don’t know his stuff, go look now!) He wanted to try out the iOptron Skytracker I had and he had borrowed a Canon 5D Mk III and a 70-200 f/2.8 lens so we had some great equipment to play with.

He took several shots of Orion using different exposures and got the Horsehead! I was thrilled to see this, but since this is a lifelong obsession of mine, I wasn’t quite satisfied. I wanted to get a pic of it with my camera and my lens (even though neither my camera or lens are as good as what he was using). So Christmas Eve, I went out with my Canon 60D and EF-s 55-250mm zoom lens. Since my lens can’t operate at f/2.8, I had to use longer exposure and higher ISO, but am pleased to report that yes, I got everything (although I didn’t take and blend multiple exposures…I have a way to go before I get as good as Sean!)

IMG_8953The Orion Nebula is at the bottom right with the Running Man just to its upper left. In the far upper left of the image is the Flame Nebula. Now look closely in the pinkish haze to the lower right of the Flame and you will see a VERY small dark horsehead shape. I got the nebula! Yes, I nerd out over that.

Although this is the shot I really wanted, I of course took some others as well. I will start off with the Andromeda Galaxy.IMG_8943Next I will go for the Pleiades. Notice the gas around it. We used to think (and some astronomers still mistakenly will say) that this is the cloud of gas and dust in which these young stars were born. However, the IRAS (Infrared Astronomy Satellite) mission showed that the stars were plowing through this gas at a high rate of speed. IRAS showed the shockwaves as the stars interact with the gas. Given the very different velocities of the stars and gas, this is almost certainly not where they were born.

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The constellation of Auriga has a wealth of star clusters as it is in the heart of the winter Milky Way. A wide shot can capture three of them at once. M37 is the bottom of the three, M36 is the middle and M38 is at the top. The Messier objects aren’t really in any particular order around the sky! These are all open clusters. The stars were born at the same time from the same cloud of gas and dust, but they are not gravitationally bound to each other so the stars will scatter around the galaxy as time goes on. They are not quite close enough together to get all three in the field of view of my 8×42 binoculars at one time…I can get either the two and the third will be just outside the field of view!

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I will make one more stop here. This pari of galaxies is M81 and M82 about 10 million light years away in Ursa Major. M81 (on the right) is a spiral galaxy much like our own Milky Way. M82 on the left is an irregular galaxy (sometimes nicknamed the Cigar Galaxy) that recently passed nearby M81. The gravitational interaction between the galaxies led to a burst of star formation in M82. M82 is called (appropriately) a starburst galaxy.

IMG_8977Winter in Tucson is a great time to observe. The nights have not been too cold and the skies have been clear. I hope to get out and do some very wide field stuff in the next few days and hope that it is clear this weekend as we have our great ISS passes coming up.

December 26, 2013 Posted by | Astrophotography, Galaxies, iOptron Skytracker, Uncategorized | 2 Comments

Comet Lovejoy and the Hercules Cluster

I got behind posting here, but last Sunday morning I went out to get Comet Lovejoy as it was passing a little over 5 degrees from the Hercules Globular cluster, also known as M13. It would have been better Saturday morning, but I got back from a trip late Friday night and getting up early Saturday just didn’t happen.

The problem Sunday morning was the Moon. The Moon was approaching full and lit up the sky when I got to Saguaro National Park east. I couldn’t see Lovejoy with the naked eye, but found it with binoculars. I took a few pics while waiting for the Moon to set. Once the Moon set, there was a very brief window before morning twilight started brightening the sky. Fortunately, I was ready to make the most of the 20 minutes or so I had.

Here is Comet Lovejoy in the lower right of the image and the fuzzy blob of M13 in the upper left.

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Next I zoomed in for a closer view of Lovejoy.

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Lovejoy still has a very nice tail. I could see the comet as a fuzzy blob naked eye once the Moon set, but it is not quite as bright as it was a couple of weeks ago.  Finally, as the sky began to gradually brighten, I found a nice saguaro and did a much wider shot with the comet.

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The Moon is entering the morning sky and will make Comet Lovejoy much less impressive, but it should still be in reach of binoculars. The comet if forecast to slowly fade to a magnitude of about 6.0 by the end of the month when the Moon will finally get out of the way. You would need really dark skies to catch it with the naked eye although it should still be all right in binoculars. Due to the Moon, I probably won’t try for it again for a couple of weeks. However, I hope to use some of the slower time around the holidays next week to try some photography in the evening!

December 17, 2013 Posted by | Astrophotography, Comet Lovejoy, Comets | , | Leave a comment

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