The Sky Tonight Update: Venus at Greatest Western Elongation

Venus at Greatest Western Elongation

The planet Venus reaches greatest eastern elongation of 47 degrees from the Sun. This is the best time to view Venus since it will be at its highest point above the horizon in the morning sky. Look for the bright planet in the eastern sky before sunrise.

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The Sky Tonight Update: Quadrantids Meteor Shower, Jan. 3-4

quadrantids meteor shower

The Quadrantids is an above average shower, with up to 40 meteors per hour at its peak. It is thought to be produced by dust grains left behind by an extinct comet known as 2003 EH1, which was discovered in 2003. The shower runs annually from January 1-5. It peaks this year on the night of the 3rd and morning of the 4th.

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The Sky Tonight Update: Full Moon

Full Moon

The Moon will be located on the opposite side of the Earth as the Sun and its face will be will be fully illuminated. This phase occurs at 17:49 UTC. This full moon was known by early Native American tribes as the Full Cold Moon because this is the time of year when the cold winter air settles in and the nights become long and dark. This moon has also been known as the Full Long Nights Moon and the Moon Before Yule.

It’s the First Day of Winter

first day of winter

The December solstice occurs at 22:23 UTC. The South Pole of the earth will be tilted toward the Sun, which will have reached its southernmost position in the sky and will be directly over the Tropic of Capricorn at 23.44 degrees south latitude. This is the first day of winter (winter solstice) in the Northern Hemisphere and the first day of summer (summer solstice) in the Southern Hemisphere.

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Geminids Meteor Shower Peaks Dec. 13, 14

Geminids Meteor Shower

The Geminids is the king of the meteor showers. It is considered by many to be the best shower in the heavens, producing up to 120 multicolored meteors per hour at its peak. It is produced by debris left behind by an asteroid known as 3200 Phaethon, which was discovered in 1982. The shower runs annually from December 7-17. It peaks this year on the night of the 13th and morning of the 14th.

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Where to Find Comet 46P/Wirtanen in Tonight’s Sky

comet 46p/wirtanen

46P/Wirtanen is a small short-period comet with a current orbital period of 5.4 years. It was one of three comets discovered by astronomer Carl Wirtanen at Lick Observatory in 1948.

On Dec. 16, 2018, 8:06 a.m. EST, less than four days after making its closest approach to the sun, 46P/Wirtanen will pass very close to the Earth — just 7,199,427 miles away. That’s among the 10 closest comet approaches that have occurred since 1950 and the 20th closest approach of a comet dating as far back as the ninth century A.D.

But while that sounds great, 46P likely will not evolve into a spectacular sight.

What we are dealing with is a very small and intrinsically faint comet; ground-based observations combined with images taken with the Hubble Space Telescope in 1996 revealed the nucleus of 46P to have a diameter charitably estimated to be around seven-tenths of a miles.

The Night Sky for December 2018

Saturn’s iconic rings are clearly visible with backyard telescopes in early December—Mercury and Venus appear later in the month. Also look for Eta Cassiopeiae, a double star, with binoculars or a small telescope to discern its gold and blue hues. Finally, don’t miss the mid-December Geminid meteor shower. You could see as many as 60 colorful meteors per hour.

Find out more about what you can see from your backyard, front stoop, or local park by viewing this monthly program. “Tonight’s Sky” is produced by HubbleSite.org, online home of the Hubble Space Telescope.

The Sky Tonight Update: Full Moon

Full moon

This November 23rd, the Moon will be located on the opposite side of the Earth as the Sun and its face will be will be fully illuminated. This phase occurs at 05:40 UTC. This full moon was known by early Native American tribes as the Full Beaver Moon because this was the time of year to set the beaver traps before the swamps and rivers froze. It has also been known as the Frosty Moon and the Hunter’s Moon.

Leonids Meteor Shower Peaks Nov. 17, 18

Leonids Meteor Shower

The Leonids is an average shower, producing up to 15 meteors per hour at its peak. This shower is unique in that it has a cyclonic peak about every 33 years where hundreds of meteors per hour can be seen. That last of these occurred in 2001. The Leonids is produced by dust grains left behind by comet Tempel-Tuttle, which was discovered in 1865. The shower runs annually from November 6-30. It peaks this year on the night of the 17th and morning of the 18th.

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