| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 32m 43.6529s[1] |
| Declination | +10° 58′ 05.878″[1] |
| Apparent magnitude (V) | 7.206[1] |
| Characteristics | |
| Spectral type | G5IV-V[1] |
| B−V color index | 0.7[1] |
| V−R color index | 0.4[1] |
| R−I color index | 0.3[1] |
| Astrometry | |
| Radial velocity (Rv) | −33 ± 5[1] km/s |
| Proper motion (μ) | RA: −6.09[1] mas/yr Dec.: 158.69[1] mas/yr |
| Parallax (π) | 32.35 ± 0.85[1] mas |
| Distance | 101 ± 3 ly (30.9 ± 0.8 pc) |
| Absolute magnitude (MV) | 4.76[2] |
| Details | |
| Mass | 0.91 (0.87 to 0.99)[3] M☉ |
| Temperature | 5700[3] K |
| Metallicity | [Fe/H] = −0.10[3] |
| Rotational velocity (v sin i) | 2[3] km/s |
| Age | 8.3 (4.1 to 11.7) × 109[3] years |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 138573 is a G-type subgiant star in the constellation of Serpens.[1] It has an apparent visual magnitude of approximately 7.206.[1] Although it is a solar-type star, similar to the Sun, a 2005 analysis rejected this star as a solar twin owing to its lower mass, lower metallicity, and older age.[4]