Acrab
* bet Sco · HIP 78820 · β1 Sco
👁️ Naked-eye
📋 A written introduction is coming — for now this page shows official values only.
Star
- Apparent magnitude
- 2.5 mag
- Parallax
- 8.07 mas → about 404.2 light-years away
- Spectral type
- B0.5V
- Right ascension
- 241.3593°
- Declination
- -19.8054°
- Designation
- * bet Sco
- Bayer designation
- β1 Sco
- HIP number
- 78820
- IAU name adopted
- 2016-08-21
- Name language
- Arabic
- Name origin (IAU)
- Arabic name al-'Aqrab for the constellation Scorpius ("the scorpion") (e.g. Al Sufi). Application of the transliteration "Acrab" specifically to the pair Beta1 and Beta2 Sco was made by Piazzi (1814) in the Palermo Catalog, and its use spread through the 19th century.
Source:IAU Working Group on Star Names · checked 2026-11-02 ↗ESA Hipparcos Catalogue (ESA Gaia Archive) · checked 2026-11-03 ↗
Related
Constellation
In everyday life
- Light from this object takes about 404 years to reach Earth — the light you see tonight left around AD 1622 (official distance ÷ speed of light).
- At magnitude 2.5 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
- Declination -19.8° — it rises above the horizon in Seoul (37.6° N), so it is visible from Korea in the right season.
Worked out from this object's official values.