18 Scorpii
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.
| 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 | 1.03±0.03 M☉ |
| Radius | 1.010±0.009 R☉ |
| Luminosity | 1.0438±0.0120 L☉ |
| Surface gravity (log g) | 4.448±0.012 cgs |
| Temperature | 5,817±4 K |
| Metallicity [Fe/H] | 0.04±0.024 dex |
| Rotation | 22.7±0.5 d |
| Age | 2.9±0.5 Gyr 5.64 or 7.18 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.