Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Centaurus |
Right ascension | 14h 21m 23.186s [1] |
Declination | −40° 23′ 38.22″ [1] |
Apparent magnitude (V) | 9.03 [2] |
Characteristics | |
Evolutionary stage | Main sequence |
Spectral type | K4V(k) [3] |
Apparent magnitude (B) | 10.137 [2] |
Apparent magnitude (J) | 7.097±0.021 [2] |
Apparent magnitude (H) | 6.608±0.026 [2] |
Apparent magnitude (K) | 6.447±0.023 [2] |
B−V color index | 1.107±0.006 [2] |
Astrometry | |
Radial velocity (Rv) | +4.48±0.45 [1] km/s |
Proper motion (μ) |
RA: −561.636
[1]
mas/
yr Dec.: −68.516 [1] mas/ yr |
Parallax (π) | 35.4337 ± 0.0762 mas [1] |
Distance | 92.0 ± 0.2
ly (28.22 ± 0.06 pc) |
Absolute magnitude (MV) | 6.80 [2] |
Details | |
Mass | 0.77 [4] M☉ |
Radius | 0.73+0.02 −0.03 [1] R☉ |
Luminosity | 0.241 [1] L☉ |
Surface gravity (log g) | 4.58 [4] cgs |
Temperature | 4,672 [4] K |
Metallicity [Fe/H] | 0.13 [4] dex |
Rotation | 37.2±2.0 d [5] |
Rotational velocity (v sin i) | 1.50 [6] km/s |
Age | 8.17 [4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 125595 is a star with a close Neptunian [6] companion in the southern constellation of Centaurus. With an apparent visual magnitude of 9.03, [2] this star is too faint to be viewed with the naked eye. It is located at a distance of 92 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +4.5 km/s. [1] The star has a high proper motion, traversing the celestial sphere and an angular rate of 0.57 arcsecond yr−1. [7]
This is an ordinary K-type main-sequence star with a stellar classification of K4V(k), [3] which indicates it is a small star that is generating energy at its core through hydrogen fusion. It is about eight [4] billion years old and is spinning with a projected rotational velocity of 1.5 km/s, [6] giving it a 37 day rotation period. [5] The star shows a moderate level of chromospherically activity due to star spots or plagues. [6] It is smaller, cooler, dimmer, and less massive than the Sun, but shows a higher atmospheric metallicity. [4]
In 2018 an exoplanet companion was announced by the HARPS program, using the radial velocity method. It is a Neptune-mass object orbiting 0.081 AU (12.1 Gm) from the host star with a period of 9.7 days. [6]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥ 0.042±0.004 MJ | 0.0809±0.0014 | 9.6737±0.0039 | 0.0 | — | — |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Centaurus |
Right ascension | 14h 21m 23.186s [1] |
Declination | −40° 23′ 38.22″ [1] |
Apparent magnitude (V) | 9.03 [2] |
Characteristics | |
Evolutionary stage | Main sequence |
Spectral type | K4V(k) [3] |
Apparent magnitude (B) | 10.137 [2] |
Apparent magnitude (J) | 7.097±0.021 [2] |
Apparent magnitude (H) | 6.608±0.026 [2] |
Apparent magnitude (K) | 6.447±0.023 [2] |
B−V color index | 1.107±0.006 [2] |
Astrometry | |
Radial velocity (Rv) | +4.48±0.45 [1] km/s |
Proper motion (μ) |
RA: −561.636
[1]
mas/
yr Dec.: −68.516 [1] mas/ yr |
Parallax (π) | 35.4337 ± 0.0762 mas [1] |
Distance | 92.0 ± 0.2
ly (28.22 ± 0.06 pc) |
Absolute magnitude (MV) | 6.80 [2] |
Details | |
Mass | 0.77 [4] M☉ |
Radius | 0.73+0.02 −0.03 [1] R☉ |
Luminosity | 0.241 [1] L☉ |
Surface gravity (log g) | 4.58 [4] cgs |
Temperature | 4,672 [4] K |
Metallicity [Fe/H] | 0.13 [4] dex |
Rotation | 37.2±2.0 d [5] |
Rotational velocity (v sin i) | 1.50 [6] km/s |
Age | 8.17 [4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 125595 is a star with a close Neptunian [6] companion in the southern constellation of Centaurus. With an apparent visual magnitude of 9.03, [2] this star is too faint to be viewed with the naked eye. It is located at a distance of 92 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +4.5 km/s. [1] The star has a high proper motion, traversing the celestial sphere and an angular rate of 0.57 arcsecond yr−1. [7]
This is an ordinary K-type main-sequence star with a stellar classification of K4V(k), [3] which indicates it is a small star that is generating energy at its core through hydrogen fusion. It is about eight [4] billion years old and is spinning with a projected rotational velocity of 1.5 km/s, [6] giving it a 37 day rotation period. [5] The star shows a moderate level of chromospherically activity due to star spots or plagues. [6] It is smaller, cooler, dimmer, and less massive than the Sun, but shows a higher atmospheric metallicity. [4]
In 2018 an exoplanet companion was announced by the HARPS program, using the radial velocity method. It is a Neptune-mass object orbiting 0.081 AU (12.1 Gm) from the host star with a period of 9.7 days. [6]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥ 0.042±0.004 MJ | 0.0809±0.0014 | 9.6737±0.0039 | 0.0 | — | — |