COSMOS / CONSTELLATIONS / SCO
Scorpius (Scorpion)
The Scorpion. IAU abbreviation Sco. One of the 48 classical constellations listed by Ptolemy in the Almagest in the 2nd century AD.
STAR CHART
KEY FACTS
- IAU abbreviation
- Sco
- Latin name / genitive
- Scorpius / Scorpii
- Position
- Right ascension ≈ 16 h 53 m; declination −46° to −8°
- Visibility from Türkiye
- Visible in full from anywhere in Türkiye. When it crosses the meridian its centre stands about 23° above the horizon from Ankara.
- Best time to observe
- Best placed at 21:00 Türkiye time around 1 August.
- Number of stars
- 174 stars brighter than magnitude 6.5 in the catalogue; 41 brighter than 5 and 20 brighter than 4.
INTERACTIVE LAB
Where is Scorpius 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 1 August). Change the city to compare the view from elsewhere in Türkiye and around the world.
MYTH, HISTORY AND OBSERVING
The scorpion that stung Orion to death, which is why the two are never seen in the sky together. The name of the red supergiant Antares means “rival of Mars”. The globular cluster M4 and the open clusters M6 and M7 are here; from Türkiye the curling tail hugs the southern horizon on summer nights.
BRIGHTEST STARS
| Star | Magnitude | Distance (light-years) | Spectral type |
|---|---|---|---|
| Antares | 1.06 | 554 | M1Ib |
| Shaula | 1.62 | 571 | B1.5IV+ |
| Sargas | 1.86 | 300 | F1II |
| Dschubba | 2.29 | 491 | B0.2IV |
| Larawag | 2.29 | 64 | K2IIIb |
| κ Sco | 2.39 | 483 | B1.5III |
| Acrab | 2.56 | 404 | B0.5V |
| Lesath | 2.70 | 576 | B2IV |
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.