CreditCalifornia Institute of Techonology
We’ve become accustomed to seeing the face of the moon in its tidal locked rotation around the Earth. In fact, the dark side of the moon has become a mystery and a thing for fictional devices. It’s not that the dark side of the moon has never been photographed or explored, but it sure looks great when see from a million miles away, crossing in front of Earth.
EurtheCast (pronounced ‘earthcast’), a Vancouver company, has launched aboard a Russian Progress 53 cargo ship two cameras that will continuously photograph the surface of Earth 24/7 and relay pictures in near-real time back to earth.
One of the instruments is a still camera with a five-meter resolution and takes pictures of a 40km swath as the ISS circles the globe. The other instrument is a video camera with a one-meter resolution and will take 150 videos a day. These videos will be approximately 90 seconds long and have a 4k resolution.
With your free EurtheCast account, you can have a real time alert sent to you about locations on earth you want to watch as the UrtheCast cameras capture new imagery and video of your favorite places.
So, stand by for some great views of our planet from a place few people have been lucky enough to enjoy.
Great news, everyone! Astronomers world wide have confirmed that in the last day or so, ISON has increased in brightness to the point where it is visible to the naked eye. You still have to look closely, as it is still on the border of visibility. Astronomers expect the comet to brighten as it continues to approach the Sun, but no one can know for sure. Through telescopes the green color of the comet is visible.
So why is the comet green? It isn’t uncommon for comets to glow green. This is due to the presence of certain chemicals inside the comet that are released as the nucleus sublimates away into space. Most often these chemicals are cyanogen (CN) and diatomic carbon (C2). Both of these chemicals emit greenish-blue light when in a vacuum (like outer space) and exposed to large amounts of energy (which they are getting from the Sun).
Today I came across this awesome interactive website that allows you to track ISON (as well as other Solar System objects) through the sky from different points of view. I’ll be using it to see where ISON will be over the next view weeks, it also gives you key dates and info. Click the picture below to visit the site:
Unfortunately for us here in Baton Rouge, the next few days have a lot of clouds in the forecast! There will still be time to view the comet early next week once the sky clears… Between now and November 28 the comet is approaching the Sun. From Earth it will be getting closer and closer to the horizon in the early morning sky. If you can, try and view it before Thanksgiving. All you have to do is:
1. Wake up very early, around 5:00 AM!
2. Find a place with a clear view of the eastern horizon.
3. Find the constellation Virgo (outlined in the image above), it will be nearly due east.
4. Look for a faint fuzzy object
5. If you’re feeling up to it, bring the camera out and snap a picture. Click here for a past article about astrophotography tips, it is for a meteor shower, but similar rules apply.
6. While you’re out, don’t miss Saturn, Mercury, and Mars.
Astronomers are unsure of ISON’s fate after it’s close approach to the Sun (which will occur on Thanksgiving Day), it is possible that the Sun’s gravity will cause ISON’s nucleus to break apart. If ISON survives its close encounter with the Sun, it will be visible once again in the morning sky around December 6th. Cross your fingers for ISON’s safe passage around the Sun, and happy viewing!
NASA just released a panoramic image of Saturn and some of its closest moons, but it also includes the tiny, blue dot we call home – planet Earth, some 900 million miles away. Taken by the Cassini probe now orbiting Saturn, the image also captures our companion worlds Venus and Mars. The panorama was pieced together from natural-color photographs taken in July.
Each pixel in the photograph represents about 45 miles. Seven out of Saturn’s 53 known moons are visible in their planet’s seven rings. There’s Prometheus, Pandora, Janus and Epimetheus near Saturn’s slim F ring. There’s Enceladus in the bright blue E ring. There’s Tethys, a yellow bulb, and Mimas, just a crescent, wedged between rings.
Venus is located to Saturn’s upper left, which is seen as a bright, white spot. Mars, a pale red dot, is above and to the left of Venus. There are 809 stars captured by Cassini’s lens in this image. And we Earthlings are on the blue dot at Saturn’s lower right.
This cosmic portrait had been planned for months and on July 19, NASA announced that all the conditions were right for such a picture, including that on this date, Saturn completely eclipsed the sun, allowing Cassini’s sensors to image this portrait. The cosmic photo is a composite of 141 images taken over four hours, selected out of 343 images total. The photograph was then digitally enhanced to pull from the blackness Venus, Mars, Earth, Saturn’s moons, and all the stars in the frame. Most of the objects in the photograph, including Earth, were brightened by 8 times relative to Saturn; some of the stars were brightened by as much as 16 times.
This was also the first time that humans were told in advance that Earth was being put before a camera. So, in what was called NASA’s “Wave at Saturn” campaign, the Cassini’s Imaging team asked us all to turn out for the July 19 picture day to wave and smile for the camera in the cosmos.
“On July 19, 2013, in an event celebrated the world over, NASA’s Cassini spacecraft slipped into Saturn’s shadow and turned to image the planet, seven of its moons, its inner rings — and, in the background, our home planet, Earth.”(NASA)
Remember when we wrote about the Casini Spacecraft photographing the Earth from the other side of Saturn? Well, now all the data and pixels have been put together with a lot of hard work from the project scientists and the amazing result is here:
Go look at the amazing image from across the solar system. You will be amazed…. Zoom in and look at the planets and other objects in the background.
NASA is back up and running, and we’ve got some pictures back from Juno! The spacecraft bound for Jupiter, made a close flyby around Earth two weeks ago to get the gravitational assist it needed to reach the outer solar system. While passing Earth, Juno snapped a picture of our home planet. It also tested some instruments to make sure they were ready to go upon arrival at Jupiter.
Click here for status update of the Juno mission.
A 3-D map of the Tamu Massif formation, which scientists now say is one huge shield volcano
Illustration courtesy IODP
“This finding goes against what we thought, because we found that it’s one huge volcano,” said William Sager, a geology professor at the University of Houston in Texas. Sager is lead author in a study about the find that was published this week in the peer-reviewed journal Nature Geoscience.
“It is in the same league as Olympus Mons on Mars, which had been considered to be the largest volcano in the solar system,” Sager told National Geographic.
Mars has two moons, Phobos and Deimos. They are very different than our moon in more ways than one. Our Moon orbits Earth at an angle, while Mars’ moons orbit about the planet’s equator. Our Moon is 3474 km across, making it nearly a quarter of Earth’s size. Phobos is about 25 km across, and Deimos is about 10 km across; comparable in size to down town Baton Rouge. Our Moon takes 27 Earth days to orbit one time, Mars’ moons orbit much faster. Phobos, the larger and closer of the two, orbits quickly, circling Mars once every eight hours. Deimos, the smaller and farther of the two, orbits slower, circling once every 30 hours. From the point of view of a person or robot on the surface of Mars, Phobos eclipses Deimos frequently. This is because the two moons orbit in nearly the same plane.
Last week this was photographed for the first time by Curiosity. The spacecraft took a series of images, a sort of timelapse, that scientists here on Earth made into a short movie. Phobos looks vastly larger than Deimos, this is merely because it is closer.
Right now, Earth is entering the debris field of comet Swift-Tuttle. What does this mean? Perseid Meteor Shower is upon us! It takes Earth about two weeks to pass through the field of dust, rock, and metal left behind from the comet. These bits, also known as meteors, fall into Earth’s atmosphere and burn up, leaving streaks of light in what appears to be the northern sky. The meteors appear to radiate from the constellation Perseus. It is not essential to know where Perseus is; just look north. In the middle of the two weeks it takes Earth to pass through the debris (this year August 12th and 13th) is the peak of the shower. The best time to see the meteors is after midnight, this year the Moon will be in the Waxing Crescent Phase, and will set in the early evening. Therefore, the sky will be extra dark, making it perfect for photography. The peak is still about a few days away, but that gives you time to practice your meteor photographing skills in anticipation for the big night.
Not all astrophotography is difficult, especially in the age of digital cameras. You can accomplish good results with most digital cameras and a tripod. My two weapons of choice are a Canon 7D with a 180 degree fisheye lens, for capturing pictures that we can use in the planetarium, and of course my Sony Nex-5 (if you’re in the market for a new camera, Sony makes a whole family of Nex cameras at a variety of prices). Small point and shoot cameras can work too! Many of these little cameras come with some if not all of the necessary manual controls.
For the meteor shower I will set up both cameras. Below you can see how the two kinds of pictures look different. The circular “dome master” picture from the 7D projects onto the planetarium dome, while the rectangular picture from the Nex-5 is for printing or viewing on a computer screen.
So here’s what to do. I’d recommend experimenting in your back yard or somewhere with little light from nearby houses first (with long exposure images, you’ll be surprised how much human-made light will show up in your photos). While we hope for totally clear skies, a few stray clouds here and there can make for some interesting additions to your photos. Especially when doing long exposure shots……
1. Point your camera north towards the meteors, and switch it to the manual mode.
2. Higher ISOs make the camera more sensitive to light (better for dark conditions). Some digital cameras let you go to ISOs up in the thousands, but don’t get too carried away. These high ISO values can result in noisy images. I usually set ISO between 800 and 1600 for taking pictures of the night sky.
3. Many digital cameras allow you to adjust your shutter speed. In order to pick up starlight, you need to have a minimum of about 3 seconds of the shutter open. Yes, you read correctly. For everyday photography shutter speeds are hundredths or thousandths of a second. For nighttime shots that shutter needs to stay open for a while to collect as much light as possible. Also, make sure that your f/stop (how wide the aperture is open) is as wide as it can go. The wider the aperture the smaller the f/stop number (f/2 f/4 f/5.6), and the more light enters the lens.
4. Some cameras have a setting called “bulb”, which allows you to leave the shutter open for as long as you want! It closes when you press the picture button again. If you have this setting, experiment with this too. Remember, the Earth is rotating; the stars appear to slowly rise in the east and set in the west. By using the bulb setting and leaving your shutter open for about 10 minutes or so, you will begin to see “star trails” showing up in your picture.
So the longer you leave your shutter open, the longer your “star trails” will become. Also, you will get more meteors in your picture. Check out these cool pictures taken by someone else.
5. So, perhaps we can crank up the ISO and the shutter speed and we’ll get awesome pics, right? Not exactly. Exposure for too long paired with ISO that is too high results in a noisy image. The black parts of your image will have tiny dots of blue, green, and red. This happens when the light sensor in your camera heats up. So there is a trade off…
To capture less light over a longer period of time, try longer exposures of 10 min + , bring the ISO to 800 or less. If you want to capture more light over a short period of time, try higher ISO 800+, bring the shutter speed down under 10 min. If your camera is older, try an ISO threshold of 400 + or -.
6. I will leave you with one last tip. Keep that camera as still as possible! If you don’t have a tripod, you can prop your camera up on a table or even on the ground. When pressing the picture button, be very careful not to knock the camera. If you use the bulb function you will have to press the picture button again to close the shutter and finish the picture. It is most essential that you are careful at this point. Disturbing the camera will blur your image.
In summary. All cameras take slightly different pictures, experiment and see what results you get with your set up. The more you experiment with different settings and combinations the more you will understand how your manual functions work. It’s a learning experience. Have fun!