COSMOS / CONSTELLATIONS / CEN
Centaurus (Centaur)
The Centaur. IAU abbreviation Cen. One of the 48 classical constellations listed by Ptolemy in the Almagest in the 2nd century AD.
STAR CHART
KEY FACTS
- IAU abbreviation
- Cen
- Latin name / genitive
- Centaurus / Centauri
- Position
- Right ascension ≈ 13 h 06 m; declination −65° to −31°
- Visibility from Türkiye
- From Türkiye only its northern part is seen, low on the southern horizon; the southern provinces are better placed.
- Best time to observe
- Best placed at 21:00 Türkiye time around 5 June.
- Number of stars
- 287 stars brighter than magnitude 6.5 in the catalogue; 61 brighter than 5 and 21 brighter than 4.
INTERACTIVE LAB
Where is Centaurus tonight?
Only the northern part of this constellation is seen from Türkiye, low on the southern horizon. The lab opens for Ankara on today’s date; switch the city to Antalya and then to Sydney and watch how the “Visible part” row and the chart change. The “Best night” button jumps to the best date (around 5 June).
MYTH, HISTORY AND OBSERVING
The wise centaur Chiron. It contains Alpha Centauri, the nearest star system to the Sun (about 4.4 light-years), and Omega Centauri, the largest globular cluster. The northern part of the constellation is visible low in the south from Türkiye; Omega Centauri can be picked out very close to the horizon from the southern provinces, but Alpha Centauri never rises.
BRIGHTEST STARS
| Star | Magnitude | Distance (light-years) | Spectral type |
|---|---|---|---|
| Rigil Kentaurus | -0.01 | 4 | G2V |
| Hadar | 0.61 | 392 | B1III |
| Toliman | 1.35 | 4 | K1V |
| Menkent | 2.06 | 59 | K0IIIb |
| γ Cen | 2.20 | 130 | A1IV |
| ε Cen | 2.29 | 427 | B1III |
| η Cen | 2.33 | 306 | B1Vn |
| ζ Cen | 2.55 | 382 | B2.5IV |
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.