COSMOS / CONSTELLATIONS / ORI
Orion (Hunter)
The Hunter. IAU abbreviation Ori. One of the 48 classical constellations listed by Ptolemy in the Almagest in the 2nd century AD.
STAR CHART
KEY FACTS
- IAU abbreviation
- Ori
- Latin name / genitive
- Orion / Orionis
- Position
- Right ascension ≈ 5 h 35 m; declination −11° to +20°
- Visibility from Türkiye
- Visible in full from anywhere in Türkiye. When it crosses the meridian its centre stands about 55° above the horizon from Ankara.
- Best time to observe
- Best placed at 21:00 Türkiye time around 10 February.
- Number of stars
- 204 stars brighter than magnitude 6.5 in the catalogue; 50 brighter than 5 and 15 brighter than 4.
INTERACTIVE LAB
Where is Orion tonight?
The lab opens for Ankara on today’s date. Drag the time slider through the night; the “Best night” button jumps to the date when the constellation is highest at 21:00 (around 10 February). Change the city to compare the view from elsewhere in Türkiye and around the world.
MYTH, HISTORY AND OBSERVING
Orion, the giant hunter of myth and one of the best-known constellations. The red supergiant Betelgeuse dimmed noticeably in 2019–2020; the blue supergiant Rigel and the three stars of the Belt stand out at a glance. In the sword below the Belt, the Orion Nebula (M42), about 1,350 light-years away, is visible to the naked eye.
BRIGHTEST STARS
| Star | Magnitude | Distance (light-years) | Spectral type |
|---|---|---|---|
| Rigel | 0.18 | 863 | B8Ia |
| Betelgeuse | 0.45 | 498 | M2Ib |
| Bellatrix | 1.64 | 252 | B2III |
| Alnilam | 1.69 | 1,977 | B0Ia |
| Alnitak | 1.74 | 736 | O9.5Ib |
| Saiph | 2.07 | 647 | B0.5Iavar |
| Mintaka | 2.25 | 692 | O9.5II |
| Hatysa | 2.75 | 2,330 | O9III |
Magnitude: apparent brightness; the smaller the number, the brighter the star. Distances derive from parallax measurements and are uncertain for distant stars. Source: HYG v4.1 star catalogue (CC BY-SA 4.0).
SOURCES
Position, visibility and best observing time were computed approximately for this page from the catalogue stars (Ankara, 39.9° N). The 88 constellations were adopted by the IAU in 1922; their boundaries were drawn by Eugène Delporte in 1930.