Omicron Scorpii
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 20m 38.2s |
| Declination | –24° 10′ 10″ |
| Apparent magnitude (V) | +4.57[1] |
| Distance | 880 ± 130 ly (270 ± 40 pc) |
| Spectral type | A4II/III[2] |
| Other designations | |
Omicron Scorpii (ο Sco, ο Scorpii) is a star in the constellation Scorpius. It is a white A-type bright giant with an apparent magnitude of +4.57 located approximately 1,200 light years from Earth. This star has about eight times the mass of the Sun and is roughly 40 million years old.[2]
The star is radiating around 3,200 times the luminosity of the Sun from its outer atmosphere at an effective temperature of about 8,100 K.[1] While it was occasionally mentioned as a possible member of the Upper Scorpius sub-group in the Scorpius-Centaurus OB association during the 20th century,[1] it does not appear in more recent membership lists for this group[3] due to its small proper motion and small trigonometric parallax as measured by Hipparcos, which is suggestive that it is a background star unrelated to Scorpius-Centaurus.
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