HD 129445
HD 129445 is a G-type star found in the Circinus constellation located 219 light-years (67 parsecs) away from the Sun based on parallax. It is invisible to the naked eye with an apparent visual magnitude of 8.80. The star was observed by the Magellan Planet Search Program due to its absolute visual magnitude and high metallicity. The Magellan program conducted 17 doppler velocity measurements, which spans a full orbital period. The results led the program to detect a planet dubbed HD 129445 b. In 2023, the inclination and true mass of HD 129445 b were determined via astrometry.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 2.51+1.1 −0.54 MJ |
2.984+0.039 −0.054 |
4.933+0.093 −0.13 |
0.572+0.087 −0.086 |
52+24 −19 or 128+19 −24° |
— |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Circinus |
| Right ascension | 14h 46m 03.06521s |
| Declination | –68° 45′ 45.8797″ |
| Apparent magnitude (V) | 8.80 |
| Characteristics | |
| Spectral type | G6V |
| Apparent magnitude (B) | 9.556 |
| Apparent magnitude (J) | 7.531±0.023 |
| Apparent magnitude (H) | 7.243±0.027 |
| Apparent magnitude (K) | 7.167±0.026 |
| B−V color index | 0.756±0.002 |
| Astrometry | |
| Radial velocity (Rv) | +8.56±0.13 km/s |
| Proper motion (μ) | RA: –197.892 mas/yr Dec.: –57.069 mas/yr |
| Parallax (π) | 14.9136 ± 0.0147 mas |
| Distance | 218.7 ± 0.2 ly (67.05 ± 0.07 pc) |
| Absolute magnitude (MV) | 4.73 |
| Details | |
| Mass | 1.06+0.03 −0.05 M☉ |
| Radius | 1.18±0.01 R☉ |
| Luminosity | 1.229+0.005 −0.004 L☉ |
| Surface gravity (log g) | 4.39±0.08 cgs |
| Temperature | 5,605+21 −34 K |
| Metallicity [Fe/H] | 0.36±0.10 dex |
| Rotational velocity (v sin i) | 1.4 km/s |
| Age | 4.94+3.77 −2.04 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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