Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Circinus |
Right ascension | 14h 46m 03.06521s [1] |
Declination | –68° 45′ 45.8797″ [1] |
Apparent magnitude (V) | 8.80 [2] |
Characteristics | |
Spectral type | G6 V [3] |
Apparent magnitude (B) | 9.556 [2] |
Apparent magnitude (J) | 7.531±0.023 [2] |
Apparent magnitude (H) | 7.243±0.027 [2] |
Apparent magnitude (K) | 7.167±0.026 [2] |
B−V color index | 0.756±0.002 [2] |
Astrometry | |
Radial velocity (Rv) | +8.56±0.13 [1] km/s |
Proper motion (μ) |
RA: –197.892
mas/
yr
[1] Dec.: –57.069 mas/ yr [1] |
Parallax (π) | 14.9136 ± 0.0147 mas [1] |
Distance | 218.7 ± 0.2
ly (67.05 ± 0.07 pc) |
Absolute magnitude (MV) | 4.73 [2] |
Details [4] | |
Mass | 1.06+0.03 −0.05 M☉ |
Radius | 1.18±0.01 [5] R☉ |
Luminosity | 1.229+0.005 −0.004 [5] L☉ |
Surface gravity (log g) | 4.39±0.08 cgs |
Temperature | 5,605+21 −34 [5] K |
Metallicity [Fe/H] | 0.36±0.10 dex |
Rotational velocity (v sin i) | 1.4 [6] km/s |
Age | 4.94+3.77 −2.04 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 129445 (HIP 72203; LTT 5856) is a star located in the southern constellation Circinus. It has an apparent magnitude of 8.80, [2] making it faintly visble in binoculars but not to the naked eye. The object is located relativelyt close at a distance of 219 light-years based on Gaia DR3 parallax measurements but it is drifting away with a spectroscopic radial velocity of 8.56 km/s. [1] It has an absolute magnitude of +4.73, [2] which is similar to the Sun's absolute magnitude of 4.83.
HD 129445 has a stellar classification of G6 V, [3] indicating that it is an ordinary G-type main-sequence star like our Sun, albeit a bit cooler. It has 106% the mass of the Sun [4] and 118% the radius of the Sun. [5] It radiates 1.23 times the luminosity of the Sun from its photosphere at an effective temperature of 5,605 K, [5] giving it a yellow hue when viewed in the night sky. HD 129445 is extremely metal enriched with an iron abundance more than twice of that of the Sun's [4] and it spins slowly with a projected rotational velocity of 1.4 km/s. [6] It is slightly older than the Sun at the age of 4.94 billion years. [4]
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. [8] [9] [10] In 2023, the inclination and true mass of HD 129445 b were determined via astrometry. [11]
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 [1] |
Declination | –68° 45′ 45.8797″ [1] |
Apparent magnitude (V) | 8.80 [2] |
Characteristics | |
Spectral type | G6 V [3] |
Apparent magnitude (B) | 9.556 [2] |
Apparent magnitude (J) | 7.531±0.023 [2] |
Apparent magnitude (H) | 7.243±0.027 [2] |
Apparent magnitude (K) | 7.167±0.026 [2] |
B−V color index | 0.756±0.002 [2] |
Astrometry | |
Radial velocity (Rv) | +8.56±0.13 [1] km/s |
Proper motion (μ) |
RA: –197.892
mas/
yr
[1] Dec.: –57.069 mas/ yr [1] |
Parallax (π) | 14.9136 ± 0.0147 mas [1] |
Distance | 218.7 ± 0.2
ly (67.05 ± 0.07 pc) |
Absolute magnitude (MV) | 4.73 [2] |
Details [4] | |
Mass | 1.06+0.03 −0.05 M☉ |
Radius | 1.18±0.01 [5] R☉ |
Luminosity | 1.229+0.005 −0.004 [5] L☉ |
Surface gravity (log g) | 4.39±0.08 cgs |
Temperature | 5,605+21 −34 [5] K |
Metallicity [Fe/H] | 0.36±0.10 dex |
Rotational velocity (v sin i) | 1.4 [6] km/s |
Age | 4.94+3.77 −2.04 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 129445 (HIP 72203; LTT 5856) is a star located in the southern constellation Circinus. It has an apparent magnitude of 8.80, [2] making it faintly visble in binoculars but not to the naked eye. The object is located relativelyt close at a distance of 219 light-years based on Gaia DR3 parallax measurements but it is drifting away with a spectroscopic radial velocity of 8.56 km/s. [1] It has an absolute magnitude of +4.73, [2] which is similar to the Sun's absolute magnitude of 4.83.
HD 129445 has a stellar classification of G6 V, [3] indicating that it is an ordinary G-type main-sequence star like our Sun, albeit a bit cooler. It has 106% the mass of the Sun [4] and 118% the radius of the Sun. [5] It radiates 1.23 times the luminosity of the Sun from its photosphere at an effective temperature of 5,605 K, [5] giving it a yellow hue when viewed in the night sky. HD 129445 is extremely metal enriched with an iron abundance more than twice of that of the Sun's [4] and it spins slowly with a projected rotational velocity of 1.4 km/s. [6] It is slightly older than the Sun at the age of 4.94 billion years. [4]
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. [8] [9] [10] In 2023, the inclination and true mass of HD 129445 b were determined via astrometry. [11]
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 ° |
— |