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Halfway there: Famous Halley’s Comet reaches aphelion this weekend. Here’s what that means

Will be visible again in 2061

C-141 Kuiper Airborne Imagery of Comet Halley (New Zealand Expedition) PHOTO CREDIT Photo taken with equipment designed, mounted on the headring and operated by the Charleston (South Carolina) County School District CAN DO Project; (NASA)

ORLANDO, Fla. – One of the most famous comets in history will soon be back on its way toward the inner solar system. Don’t get too excited just yet, though. It still has 38 more years to go until we can see it again on earth.

On Saturday, Halley’s Comet will reach aphelion or greatest distance from the sun which is beyond the planet Neptune.

Halley's Comet is a short-period comet with an orbit that goes beyond Neptune.

Halley’s Comet is considered a short-period comet, a comet that has an orbit of less than 200 years. On average, the comet is visible from earth every 76 years.

It was last visible in 1986 and will become visible again in 2061.

The comet is named after English astronomer Edmond Halley who correctly predicted the comet would return in the year 1758. Until that point, it was believed comets only made one pass through the solar system.

Halley’s Comet isn’t just famous for its multiple recorded occurrences in history, it’s also been one of the brightest.

Notable comets in the Northern Hemisphere.

In astronomy, the smaller the number, the brighter the object.

The smaller the magnitude, the brighter the object. Most magnitudes of 5 or greater require a telescope or binoculars, but there are other factors such as the size of the object. Comet SWAN as of 5/8 has a magnitude of 5.3. It has been reported as naked-eye visible from the Southern Hemisphere.

During the comet’s last pass in 1986, it reached magnitude 2.

For comets, the size of the nucleus also is extremely important as to how visible it will be in the sky. A large nucleus will make it easier to view.

What is a comet?

Comets are large icy bodies that move through space that oftentimes originate from the Kuiper Belt or Oort Cloud beyond the orbit of Pluto.

Our solar system. The Oort cloud, where comets are born resides 2,000 au from the sun, far beyond pluto. Earth is 1 au, astronomical unit from the sun.

Typically they are the size of a small town. On approach to the sun, they heat up producing the iconic glowing head and tail.