Three evenly bright stars in a short, straight row — the most recognised asterism on Earth, the fastest way for a beginner to get their bearings in the winter sky, and the pointer to Sirius, Aldebaran and the Pleiades.
The three stars
| Star | Designation | Magnitude | Distance | Notes |
|---|---|---|---|---|
| Mintaka | δ Orionis | 2.23 | ~1,200 ly | Western end; actually a multiple-star system headed by a hot blue giant |
| Alnilam | ε Orionis | 1.69 | ~2,000 ly | Centre and brightest; a blue-white supergiant ~400,000x the Sun's light |
| Alnitak | ζ Orionis | 1.77 | ~1,260 ly | Eastern end; a hot blue supergiant with a nearby companion star |
The row spans just under three degrees — about two finger-widths at arm's length — and its even spacing is the giveaway. But the trio is a trick of perspective: the two end stars sit around 1,200-1,300 light-years away while centre-star Alnilam is nearer 2,000, so the sky's truest-looking straight line is really three unrelated suns that merely share our line of sight. All three are young, hot, blue-white stars of the kind that burn out in millions rather than billions of years.
How to find it tonight
In the northern hemisphere, December through February, go out in the early-to-mid evening and face south: the belt rides about halfway up the sky, its three stars hanging in a neat diagonal with brilliant blue-white Rigel below-right and orange Betelgeuse above-left — once you see the row, the rest of the hunter snaps into place around it. Southern-hemisphere observers get the same show on summer evenings, with the figure standing on his head and the belt rising nearly vertical. Outside the season the belt is still up in the small hours or before dawn — the live sky map shows exactly where from your location right now.
The sky's best signpost
Because the belt is short, bright and precisely straight, it is the pointer experienced observers use to find half the winter sky. Follow the line of the three stars down and east (lower-left for northern observers) and the first brilliant star you hit is Sirius in Canis Major — the brightest star in the night sky. Follow it up and west and you reach orange Aldebaran, the eye of Taurus, with the tiny dipper-shaped Pleiades cluster just beyond. Two hops, two of the sky's most famous sights — the reason the belt is where almost every stargazing guide tells a beginner to start.
Below the belt: the Sword and the Orion Nebula
Hanging from the belt on its eastern side is a short line of fainter stars — the Sword. Its middle "star" is not a star at all but the Orion Nebula (M42), a vast star-forming cloud around 1,300 light-years away. To the naked eye it is a soft blur; in steadily-held binoculars it resolves into a glowing fan of gas with a tight quartet of newborn stars at its heart. If you own one pair of binoculars and one winter evening, this is the thing to look at.
Three stars, many names
Because the row is visible from every inhabited latitude, cultures named it independently: the Three Kings and Three Sisters in European folk tradition, the Tres Marías across the Spanish-speaking world, and a staff, a boat's mast or a hunting net elsewhere. The International Astronomical Union keeps none of these — officially the three are just δ, ε and ζ Orionis — but no official list has ever out-searched "Orion's Belt."
Frequently asked
What are the three stars of Orion's Belt?
Mintaka, Alnilam and Alnitak, from west to east. Alnilam sits in the middle and is the brightest at magnitude 1.69; Alnitak (1.77) marks the eastern end and Mintaka (2.23) the western end. All three are hot blue-white stars hundreds of times more luminous than the Sun.
How far away are the belt stars?
Roughly 1,200 to 2,000 light-years, and importantly they are not at the same distance: Alnitak and Mintaka lie around 1,200-1,300 light-years away while central Alnilam is nearer 2,000. The even row is a line-of-sight coincidence, not a physically bound trio.
How do I find Orion's Belt?
On winter evenings (December through February in the northern hemisphere) face roughly south and look for three evenly spaced bright stars in a short, straight row — the only such row in the winter sky. From the southern hemisphere the same row appears overhead on summer evenings, standing on end.
What is the fuzzy thing hanging below the belt?
That is the Sword, and its middle smudge is the Orion Nebula (M42) — a star-forming cloud about 1,300 light-years away that is visible to the naked eye under a dark sky and turns into a glowing drift of gas in ordinary binoculars. It is the single best binocular target in the whole sky.
What do the belt stars point to?
Extend the belt line down and to the east (lower left, for northern observers) and you reach Sirius, the brightest star in the night sky. Extend it up and to the west and you land on orange Aldebaran in Taurus, with the Pleiades cluster just beyond. The belt is the winter sky's most useful signpost.
Where to go next
Orion constellation guide · How to start stargazing · All constellation guides · Meteor showers · Live sky map