蜜桃恋人

Orion the Hunter Reigns in the Winter Sky

Photo Credit
NASA
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Where is Orion in the winter sky?

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Step outside anytime after 9 P.M. in winter, and it鈥檚 easy to spot Orion the Hunter, one of the season鈥檚 most easily recognizable constellations. Read Bob Berman鈥檚 post about Orion鈥檚 five bright stars and why it鈥檚 so special.

Many of you can probably identify the Hunter鈥檚 Belt, those three stars in a row. But let鈥檚 find two even brighter stars of the Hunter (one red-orange and the other white-blue)!

Of the 88 constellations, most are incoherent, hallucinogenic smatterings. Orion is different. Along with the Big Dipper (best seen in the spring), Orion is often one of the first celestial patterns a child will notice, thanks to its Belt of three medium-bright stars in a row.

Orion the Hunter is Visible Everywhere

Orion floats in a very special space. Orion鈥檚 belt sits directly over Earth鈥檚 equator. Only stars in that location are seen by everyone, everywhere. 

Conversely, a star located over one of the poles鈥攖he North Star, say鈥攊s forever hidden from people of the opposite hemisphere, blocked by Earth itself. From the US, Canada, and Europe, about a fourth of the sky never rises. Major luminaries forever concealed from our view include our companion galaxies (the Magellanic clouds) and the Southern Cross.

But Orion the Hunter, which straddles the equator like a diplomat, is visible around the world. A few thousand years ago, middle-eastern sky-watchers visualized those three stars as the waistline of a sheep. But in a wonderful, woolen, rags-to-riches story, Orion got promoted to human. That wasn鈥檛 enough to bring him good luck, and he was killed by a scorpion sting.


Credit: NASA

Orion is in our Milky Way Galaxy

All the stars in the Orion constellation and Orion鈥檚 belt are located in our own galaxy, the Milky Way! In fact, the spiral arm where are Sun is located is called 鈥淭he Orion Arm鈥 which gets its name from the constellation Orion the Hunter. That鈥檚 why we see so many bright objects within the constellation Orion. We are neighbors of a sort!


Credit: NASA

Finding Orion鈥檚 5 Major Stars

Many of the Hunter鈥檚 stars share the same awesome thousand light-year distance, forming a lavish association of blue suns of arc-welder intensity. If you have binoculars, they鈥檒l bring out their diamond blue-ness. Merely 1/1000th the age of our Sun, these infants were born together from an immense cloud of gas.

The Hunter鈥檚 stars rise in the early evening in the southeast; by 9 to 10 P.M. (local time), it will be high in the southwestern sky.

  1. Start with the can鈥檛-miss three stars of Orion鈥檚 Belt sitting at the Hunter鈥檚 waist. They鈥檙e medium-bright but distinctive because they make a short, straight row of evenly-spaced evenly-bright stars. These stars are named Alnilam, Mintaka and Alnitak.
    • From un-light-polluted regions, binoculars pointed at the belt would actually show more than three stars; they are immersed in a multitude of little stars like a swarm of fireflies. Away from city lights in rural areas, this faint cluster stands out with just the naked eye after your eyes get dark-adapted. If you see more than the three-start belt and see this faint cluster, you pass the dark sky鈥檚 鈥減urity test.鈥 
  2. Red giant star Betelgeuse serves as Orion鈥檚 right shoulder (pronounced BET鈥榣鈥檍ooz). It always looks pumpkin-orange to me and very distinct from all the other stars in Orion which are blue. Betelgeuse is the largest star in all the heavens. If our Earth were represented by the period at the end of this sentence, Betelgeuse would be a ball as tall as a 20-story building. 
  3. Rigel, a blue supergiant star, is near Orion鈥檚 left knee. Orion鈥檚 brightest star, Rigel stands among the most luminous objects in the galaxy, shining with the light of 55,000 suns. If it were as nearby as Alpha Centauri, we could read by its light鈥攁nd the night sky would be deep blue instead of black.

A Star Nursery

If you have binoculars handy, swing them below the leftmost belt star and you may see the 鈥淪word鈥 that hangs from the Hunter鈥檚 Belt. Do you see a fuzzy patch? That鈥檚 the Orion Nebula. This is the closest place to the Mall of America that newborn suns are being created. This stellar nursery of gas and dust is 1,500 light-years away and so large that our fastest rockets would need a half million years to cross it. The entire celestial womb glows like neon.

What to keep going? Follow Orion鈥檚 Belt down and leftward to the brightest star in all the heavens. This is the Dog Star Sirius.

What did it take, five minutes? And鈥攚ithout star charts鈥攜ou鈥檝e easily taken in some of the most famous objects in all the heavens. Orion will shine for many months to come!

About The Author

Bob Berman

Bob Berman, astronomer editor for The Old Farmer鈥檚 蜜桃恋人, covers everything under the Sun (and Moon)! Bob is the world鈥檚 most widely read astronomer and has written ten popular books. Read More from Bob Berman