Astronomy

How much is the zoom of Sun-Pluto eclipse image

How much is the zoom of Sun-Pluto eclipse image



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The Sun-Pluto eclipse picture was taken from 2 million km from Pluto. At that distance, Pluto will have angular size of just 4'5". Hence this picture must be a zoomed up image. Approximately how much will be the zoom of this image? Also, is it possible to give the power of its camera in megapixel terms? Thanks for your responses.


The "raw" LORRI image is 1024x1024 pixels. The field of view is about 0.29°, see section 3.6 of this paper, or abstract of this paper. Pluto is a little less than 250 pixels in the raw image, corresponding to 0.29° x 250/1024 = 4'15", well consistent with your estimate.


Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2021 June 6
A Distorted Sunrise Eclipse
Image Credit & Copyright: Elias Chasiotis

Explanation: Yes, but have you ever seen a sunrise like this? Here, after initial cloudiness, the Sun appeared to rise in two pieces and during partial eclipse, causing the photographer to describe it as the most stunning sunrise of his life. The dark circle near the top of the atmospherically-reddened Sun is the Moon -- but so is the dark peak just below it. This is because along the way, the Earth's atmosphere had a layer of unusually warm air over the sea which acted like a gigantic lens and created a second image. For a normal sunrise or sunset, this rare phenomenon of atmospheric optics is known as the Etruscan vase effect. The featured picture was captured in December 2019 from Al Wakrah, Qatar. Some observers in a narrow band of Earth to the east were able to see a full annular solar eclipse -- where the Moon appears completely surrounded by the background Sun in a ring of fire. The next solar eclipse, also an annular eclipse for well-placed observers, will occur later this week on June 10.


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Our monthly meetings are free and include an Astronomy Education session and the main General Meeting which often features a guest speaker. The public and visitors are most welcome to attend.

Astronomy Education: July 2021

Wednesday, 7 July 2021 7:00 PM

The ability to take stunning digital photographs of the heavens has revolutionised amateur astrophotography. How do digital cameras work and how are those wonderful images created and processed?

General Meeting: July 2021

Wednesday, 7 July 2021 8:00 PM

Decades of research have led astronomers to a staggering conclusion, that there exists a new, invisible type of mass that outweighs everything we can see five times over. Prof. Duffy will explain how we know so much about the properties of a particle we have yet to discover, and how Australia is playing a leading role in uncovering the nature of this mysterious dark matter with SABRE, the world’s first dark matter detector in the Southern Hemisphere in the Stawell gold mine.

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Friday, 9 July 2021 7:30 PM

This is a free-flowing live video session where members can discuss any aspect of our wonderful Astronomy hobby and the night sky. Topics can include how to find objects in the night sky, what equipment, software or books to buy, sharing something that has helped you in doing Astronomy, or general questions about ASSA and its facilities. The session is designed to be accessible and of interest to members at all levels.

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Experience the night sky through our telescopes at public viewing nights. Note, with the exception of online public events, in-person public viewing nights remain suspended due to COVID-19.


In this handout image provided by NASA, a partial solar eclipse is seen as the sun rises behind the Delaware Breakwater Lighthouse on June 10, 2021, in Lewes, Delaware. Aubrey Gemignani/NASA via Getty Images

A partial solar eclipse is seen over the Houses of Parliament on June 10, 2021, in London, England. Dan Kitwood / Getty Images

Capturing the Partial Phases

The shortest exposures are useful only during the partial stages near the very beginning and end of the eclipse, and they'll probably bring out little more than the smooth gradation in the shading of the penumbra, the brighter outer fringe of the shadow. That's also what you'll get if you let a camera's built-in metering system take control of the exposure.

To record the well-defined edge of the inner shadow, or umbra, which is so striking visually, you'll have to switch to manual mode and expose several times longer. Typically that means a ¼-second exposure at f/8, ISO 400, which over-exposes the Moon's brightest portion but gets sharp detail near the umbra's edge.

Once the Moon enters dark umbra, the part immersed in the deep shadow core, you should over-expose the sunlit portion of the Moon to be able to capture the entire disk together with that in the vastly brighter penumbra. Once you've found the exposure that gives you your best result during the partial phases, keep using these settings until totality. The resulting series of images can later be used to make a stunning animation of the eclipse progress.


Stunning images show the rare solar eclipse that just partially obscured the sun across the Northern Hemisphere

Astronomy enthusiasts rose in the early-morning hours to capture a rare glimpse at a solar eclipse.

Those in the northern US as well as Canada and Greenland got the best shots of the "ring of fire" eclipse that took place Thursday morning, though the eclipse was only partial for most of the Northern Hemisphere.

A sliver of sun peaked out from behind the moon over the Baltimore skyline in this image taken by an Associated Press photographer.

The space enthusiast Brandon Berkoff woke up at 5 a.m. to snap this picture from the Sunken Meadow beach on Long Island, New York. "I got there right as the sun got above the horizon," he told Insider.

The meteorology student Collin Gross was also an early riser and met about a dozen people on a beach in New Jersey waiting for the eclipse. "It was amazing!" he said. "This was the first one I've actually seen, and it's so much more amazing seeing it in person."

Here, the partially blocked sun is seen behind the Statue of Liberty:

Here, behind the Mackinac Bridge in Michigan:

Here, as seen from Delaware and Washington, DC:

The video below shows a feed from a satellite that captured the shadow of the moon darkening the Earth as it passed in front of the sun.

There won't be another annular solar eclipse this year, but it's the first of two solar eclipses in 2021.

Insider's Aria Bendix describes the celestial science behind the occurrence in a previous post.


Equipment Needed For Photographing A Solar Eclipse

Camera

Although any camera can be used for eclipse photography, a Digital SLR camera is most suited since you can change lenses and plan for photography using various focal lengths.

The recent mirrorless, as well as traditional DSLRs, are suited. The best part about DSLR cameras is that they can be connected to a laptop, and the entire eclipse photography be automated. This gives you a chance to observe the eclipse with your eyes or a pair of binoculars.

Camera Lens or Telescope?

Adjusting the camera view during a solar eclipse at the Kennedy Space Center Visitor Complex (Image credit: NASA/Ben Smegelsky)

Either a camera lens or a telescope can be used for shooting various events of the solar eclipse. While long focal length lenses such as 400mm and above can be on the expensive side, the benefit of using camera lenses is that the aperture can be controlled effectively.

When using a telescope, you have no control over the aperture since it is fixed, but many astrophotographers already have telescopes, refractors, and reflectors of long focal length. Telescopes are readily available in the range above 500mm and going up to 2000mm, and are priced relatively cheaper.

Focal Length, Wide-angle, or Super Telephoto?

A shorter focal length lens will produce a smaller image of the Sun on your sensor, and a longer focal length will produce a larger diameter of the Sun on the sensor.

Focal Length Formula

The formula to calculate the diameter image of the Sun on a digital camera sensor is:

The focal length of the lens / 110 = Diameter of the Sun on Sensor

Focal Length Size of Sun’s image:

  • 200mm lens 1.8 mm
  • 400mm lens 3.63 mm
  • 800mm lens 7.27 mm
  • 1000mm lens 9.09 mm
  • 2000mm lens 18.18 mm

The smaller dimension of a usual crop sensor in DSLR cameras is approximately 14.8mm, in which case a 1500mm lens image of the Sun would fit within the sensor but would be a tight fit, and you would need an accurate equatorial mount to track the Sun continuously.

To photograph the various events in a Solar Eclipse, would require different focal lengths for the various phases.

Solar Filters

Different types of solar filters are available, from the visual use kind, that are darker and allows less light to pass through.

You can choose solar filters that provide a neutral white image of the Sun or those that give a natural yellow-orange color.

Several companies offer solar filters that are slightly brighter and are meant for photographic use. Solar filters are available in sheets of 12-inch squares.

Many photographers also like to construct their DIY Filters made using Mylar, photo film, or glass. Filters can also be made using card paper and sandwiching the filter between. You can find the instructions to build one yourself here.

You will need a solar filter for every camera that you intend to use during the eclipse. Note, Solar filters always go in front of the telescope or camera lens.

Tripod

A sturdy tripod is a must for solar eclipse photography, the longer the focal length that you intend to use, the sturdier the tripod needs to be.

If the altitude of the eclipse is high up in the sky from your location, you need to be check that the tripod will allow you to point up at that altitude.

Most experienced photographers prefer to use a tracking equatorial mount. The benefit of such a mount is that once you point the camera and a long focal length lens or telescope at the Sun, the mount keeps following it precisely.

Equatorial mounts are sturdy, and you can mount several cameras on top of the mount.

Equatorial mount with several cameras mounted for eclipse photography. In the background, you can see the Ooty Radio Telescope, India.

Remote shutter

A remote shutter release is an essential and cheap accessory for solar eclipse photography to eliminate the possibility of accidentally nudging or bumping the camera, especially since if using long focal length lenses, any movement will be very noticeable in your images.

Various kinds of remote shutters are available from 3rd party intervalometers to built-in ones. All recent cameras have in-built intervalometers, or you can opt for an external wired intervalometer.

I find an external wired intervalometer to be much more dependable. These can be programmed to trigger the shutter repeatedly at regular intervals.


ACCESSORIES

Welcome to Lunt Solar Systems. We are the worlds leading provider of solar telescopes. Our proprietary Doppler Tuning is unmatched by any other manufacture for quality and viewing performance. When you buy Lunt, you are buying the best available solar telescope in its class.

Lunt products were used to by NASA to image the 2017 USA Eclipse from Carbondale. Lunt standard products have also been used in the past by NASA for the transit of Venus and Mercury, and by National Geographic for the Easter Island Eclipse. All of which were very successful live streaming events. Our products are ideally suited to imaging due to the ability get full disk images, rapid Doppler tuning, and ease of CCD adaptation to our systems.

We dedicate ourselves to providing high quality products for the hobbyist and armature astronomer. All of our solar telescopes use a redundant system of filters for maximum safety. Whether you’re a newcomer to the world of astronomy or a keen observer of the skies, you can’t find a high quality solar telescope or telescope accessories. Lunt Solar Telescopes are built in the USA for those that desire to take in the full beauty of the sun.

WE ARE SAFETY APPROVED

When you buy Lunt Solar Systems, you can be absolutely certain that you’re buying a 100% safety approved product. All our products are ISO safety approved and SUNsafe certified, which makes it easier to find everything you need to take in a safe view of solar activity.


These NASA photos of the sunrise solar eclipse of 2021 are just jaw-dropping

They may not show a "ring of fire," but they're still spectacular.

Most of the U.S. missed out on the "ring of fire" piece of year's first solar eclipse on Thursday (June 10), but parts of the East Coast caught a stunning sunrise partial eclipse to make up for it.

The June 10 annular eclipse was mostly visible over Canada, Greenland and Siberia, plus a small sliver of Michigan's Upper Peninsula. But skywatchers in a much wider range were able to catch the eclipse in partial phases. In many areas, the partial eclipse aligned closely with sunrise, making for a particularly eerie spectacle.

Two of NASA's staff photographers were on standby in the nation's capital and in Delaware to catch the incredible site. Bill Ingalls took in the view from Arlington, Virginia, where he was able to capture views of the eclipsed sun rising next to the U.S. Capitol building.

Meanwhile, Aubrey Gemignani headed to Lewes Beach, Delaware, where she framed her eclipse photographs against the Delaware Breakwater Lighthouse.

The eclipsed sun rises over the U.S. Capitol Building on June 10, 2021, in an image from NASA photographer Bill Ingalls.

A view of the partially eclipsed sun rising over the Delaware Breakwater Lighthouse on June 10, 2021, by Aubrey Gemignani.

A partial solar eclipse seen at sunrise with the U.S. Capitol building on display in an image taken June 10, 2021, by NASA photographer Bill Ingalls.

A partial solar eclipse seen during sunrise at Delaware Breakwater Lighthouse on June 10, 2021, photographed by Aubrey Gemignani.

An annular solar eclipse occurs when the moon passes between the sun and the Earth, but when our satellite is relatively far from Earth in its orbit, so it can't block the full disk of the sun. The result is a so-called "ring of fire" around the moon's dark circle.

Like a total solar eclipse, an annular solar eclipse is only visible from a small swath of Earth, although larger regions will be able to see the event as a partial solar eclipse. But without totality, no phase of an annular solar eclipse is safe to watch without eye protection, or to photograph without a proper solar filter.

The next solar eclipse will occur on Dec. 4, but totality will only be visible from Antarctica and nearby ocean.


Watch the video: P1000 Jupiter, Moon And Sun Zoom Test (August 2022).