18 Scorpii
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 15m 37.27028s |
| Declination | −08° 22′ 09.9821″ |
| Apparent magnitude (V) | 5.503 |
| Characteristics | |
| Spectral type | G2 Va |
| U−B color index | +0.18 |
| B−V color index | +0.64 |
| Variable type | Sun-like |
| Astrometry | |
| Radial velocity (Rv) | 11.71±0.12 km/s |
| Proper motion (μ) | RA: +232.230 mas/yr Dec.: −495.378 mas/yr |
| Parallax (π) | 70.7371±0.0631 mas |
| Distance | 46.11 ± 0.04 ly (14.14 ± 0.01 pc) |
| Absolute magnitude (MV) | 4.77 |
| Details | |
| Mass | 1.01±0.02 M☉ |
| Radius | 1.007±0.011 R☉ |
| Luminosity | 1.043±0.005 L☉ |
| Surface gravity (log g) | 4.437±0.013 cgs |
| Temperature | 5,817±4 K |
| Metallicity [Fe/H] | 0.06±0.03 dex |
| Rotation | 22.7±0.5 d |
| Age | 2.9±0.5 Gyr 5.64 or 7.18 Gyr |
| Other designations | |
| BD−07°4242, GC 21864, GJ 616, HD 146233, HIP 79672, HR 6060, SAO 141066, CCDM 16156-0822 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
18 Scorpii is a solitary star located at a distance of some 46.1 light-years (14.13 parsecs) from the Sun at the northern edge of the Scorpius constellation. It has an apparent visual magnitude of 5.5, which is bright enough to be seen with the naked eye outside of urban areas. The star is drifting further away with a radial velocity of +11.6.
18 Scorpii has some physical properties in common with the Sun, a G-type star. Cayrel de Strobel (1996) included it in her review of the stars most similar to the Sun, and Porto de Mello & da Silva (1997) identified it as a younger solar twin. Some scientists therefore believe the prospects for life in its vicinity are good.