HD 129357 is a G-type star in the constellation Boötes that is located about 154 light years from the Sun. The measured properties of this star are very similar to those of the Sun, making it a candidate solar twin. However, it has a lower abundance of lithium than the Sun and appears over 3 billion years older, so it may instead be a solar analog. It was suggested by astronomer Olin Eggen that this star is a member of the Wolf 630 moving group of stars that share a common motion through space. The space velocity components of HD 129357 are (U, V, W) = (+21.3, −36.3, −32.0).[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 41m 22.390s[1] |
| Declination | +29° 03′ 31.80″[1] |
| Apparent magnitude (V) | 7.823[2] |
| Characteristics | |
| Spectral type | G2V[3] |
| U−B color index | +0.115[3] |
| B−V color index | +0.635[3] |
| Astrometry | |
| Radial velocity (Rv) | −33.2[2] km/s |
| Proper motion (μ) | RA: +11.76[4] mas/yr Dec.: −183.50[4] mas/yr |
| Parallax (π) | 21.22 ± 1.02 mas[4] |
| Distance | 154 ± 7 ly (47 ± 2 pc) |
| Absolute magnitude (MV) | +4.49[5] |
| Details | |
| Mass | 1.00 ± 0.06[6] M☉ |
| Surface gravity (log g) | 4.16 ± 0.13[6] cgs |
| Temperature | 5,749 ± 47[6] K |
| Metallicity | [Fe/H] = −0.02 ± 0.04[6] |
| Rotational velocity (v sin i) | ≤ 2.5[6] km/s |
| Age | 8.1[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |