Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hydra |
Right ascension | 14h 02m 22.78173s [1] |
Declination | −27° 25′ 47.1992″ [1] |
Apparent magnitude (V) | 5.47 [2] |
Characteristics | |
Spectral type | K2–3III [3] |
B−V color index | 1.331±0.003 [2] |
Astrometry | |
Radial velocity (Rv) | −0.61±0.24 [1] km/s |
Proper motion (μ) |
RA: −31.861±0.259
[1]
mas/
yr Dec.: −4.195±0.215 [1] mas/ yr |
Parallax (π) | 7.3651 ± 0.1407 mas [1] |
Distance | 443 ± 8
ly (136 ± 3 pc) |
Absolute magnitude (MV) | −0.17 [2] |
Details [4] | |
Mass | 1.62±0.19 M☉ |
Radius | 21.20±2.06 R☉ |
Luminosity | 189.6±4.2 [1] L☉ |
Surface gravity (log g) | 1.96±0.07 cgs |
Temperature | 4,383±19 K |
Metallicity [Fe/H] | −0.08±0.04 dex |
Rotational velocity (v sin i) | 2.59±0.45 km/s |
Age | 1.98±0.67 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HD 122430 is single star [6] in the equatorial constellation of Hydra. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of 5.47. [2] The star is located at a distance of 105.6 light years from the Sun based on parallax.
This is an aging giant star with a stellar classification of K2–3III. [3] It has completely run out of the hydrogen fuel that keeps it stable, although it is only two billion years old, [4] younger than the Sun's 4.6 billion years. HD 122430 has a mass of 1.6 times and radius of 22.9 times that of the Sun. [4] Despite its younger age, it has slightly lower metallicity, approximately 90%. It is radiating 190 [1] times the luminosity of the Sun from its photosphere at an effective temperature of 4300 K. [4]
A candidate exoplanet was reported orbiting the star via the radial velocity method at a conference in 2003, and designated HD 122430 b. It has an orbital period of 0.94 years and an eccentricity of 0.68. [7] However, a follow-up study by Soto et al. (2015) failed to detect a signal, so it remains unconfirmed. [8]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b (unconfirmed) | >3.71 MJ | 1.02 | 344.95±1.08 | 0.68±0.09 | — | — |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hydra |
Right ascension | 14h 02m 22.78173s [1] |
Declination | −27° 25′ 47.1992″ [1] |
Apparent magnitude (V) | 5.47 [2] |
Characteristics | |
Spectral type | K2–3III [3] |
B−V color index | 1.331±0.003 [2] |
Astrometry | |
Radial velocity (Rv) | −0.61±0.24 [1] km/s |
Proper motion (μ) |
RA: −31.861±0.259
[1]
mas/
yr Dec.: −4.195±0.215 [1] mas/ yr |
Parallax (π) | 7.3651 ± 0.1407 mas [1] |
Distance | 443 ± 8
ly (136 ± 3 pc) |
Absolute magnitude (MV) | −0.17 [2] |
Details [4] | |
Mass | 1.62±0.19 M☉ |
Radius | 21.20±2.06 R☉ |
Luminosity | 189.6±4.2 [1] L☉ |
Surface gravity (log g) | 1.96±0.07 cgs |
Temperature | 4,383±19 K |
Metallicity [Fe/H] | −0.08±0.04 dex |
Rotational velocity (v sin i) | 2.59±0.45 km/s |
Age | 1.98±0.67 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HD 122430 is single star [6] in the equatorial constellation of Hydra. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of 5.47. [2] The star is located at a distance of 105.6 light years from the Sun based on parallax.
This is an aging giant star with a stellar classification of K2–3III. [3] It has completely run out of the hydrogen fuel that keeps it stable, although it is only two billion years old, [4] younger than the Sun's 4.6 billion years. HD 122430 has a mass of 1.6 times and radius of 22.9 times that of the Sun. [4] Despite its younger age, it has slightly lower metallicity, approximately 90%. It is radiating 190 [1] times the luminosity of the Sun from its photosphere at an effective temperature of 4300 K. [4]
A candidate exoplanet was reported orbiting the star via the radial velocity method at a conference in 2003, and designated HD 122430 b. It has an orbital period of 0.94 years and an eccentricity of 0.68. [7] However, a follow-up study by Soto et al. (2015) failed to detect a signal, so it remains unconfirmed. [8]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b (unconfirmed) | >3.71 MJ | 1.02 | 344.95±1.08 | 0.68±0.09 | — | — |