Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Hydra |
Right ascension | 09h 56m 29.844s [1] |
Declination | –24° 05′ 57.80″ [1] |
Apparent magnitude (V) | 7.93 [2] |
Characteristics | |
Spectral type | G2V [3] |
Apparent magnitude (B) | 8.577 [2] |
Apparent magnitude (R) | 7.71 [2] |
Apparent magnitude (J) | 6.839±0.019 [2] |
Apparent magnitude (H) | 6.577±0.034 [2] |
Apparent magnitude (K) | 6.463±0.023 [2] |
B−V color index | 0.647±0.014 [2] |
V−R color index | 0.22 [4] |
Astrometry | |
Radial velocity (Rv) | +19.56±0.19 [4] km/s |
Proper motion (μ) |
RA: –177.127
mas/
yr
[1] Dec.: +47.099 mas/ yr [1] |
Parallax (π) | 21.9301 ± 0.0267 mas [1] |
Distance | 148.7 ± 0.2
ly (45.60 ± 0.06 pc) |
Absolute magnitude (MV) | 4.66 [2] |
Details [5] | |
Mass | 1.019+0.061 −0.066 M☉ |
Radius | 1.053+0.026 −0.026 R☉ |
Luminosity | 1.180+0.036 −0.029 L☉ |
Surface gravity (log g) | 4.400+0.029 −0.032 cgs |
Temperature | 5863±88 K |
Metallicity [Fe/H] | 0.018+0.057 −0.043 dex |
Rotational velocity (v sin i) | 3.6 [6] km/s |
Age | 4.6+3.7 −2.7 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 86226 is a star with a pair of orbiting exoplanet companions, found in the constellation of Hydra. With an apparent visual magnitude of 7.93, [2] it is too dim to be visible with the naked eye. The distance to this system has been determined by the parallax method, yielding a range of 149 light years. It is receding with a heliocentric radial velocity of +19.6 km/s. [4] A survey in 2015 has ruled out the existence of any stellar companions at projected distances above 12 astronomical units. [8]
This is an ordinary G-type main-sequence star with a stellar classification of G2V. [3] It is similar in size, mass, and composition to the Sun, [5] although it isn't considered a solar twin. [9] The age is about the same; roughly 4.6 billion years old. The star is radiating 18% greater luminosity (compared to the Sun) from its photosphere at an effective temperature of 5,863 K. [5] It is spinning with a projected rotational velocity of 3.6 km/s. [6]
As of 2014 [update], Radio emission at a frequency of 150 MHz has been tentatively detected from the proximity of this system, although it is not clear whether the star or a satellite orbiting a rapidly rotating planet is the source. [10]
Due to the periodic spectrum shifts when it had when placed under a Doppler test, 13 Magellan Doppler Velocity observations were made of an object found near the star. The object discovered in 2010 had a Keplerian orbit, was declared an exoplanet and dubbed HD 86226 b. [11] A hot Super-Earth planet called HD 86226 c was discovered in 2020. [5] It may be undergoing considerable atmospheric mass loss. [12]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
c | 7.25+1.19 −1.12 M🜨 |
0.049±0.001 | 3.98442±0.00018 | 0.075+0.065 −0.048 |
86.45+0.26 −0.16 ° |
2.16±0.08 R🜨 |
b | 0.45+0.04 −0.05 MJ |
2.73±0.06 | 1628+22 −21 |
0.059+0.062 −0.039 |
— | — |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Hydra |
Right ascension | 09h 56m 29.844s [1] |
Declination | –24° 05′ 57.80″ [1] |
Apparent magnitude (V) | 7.93 [2] |
Characteristics | |
Spectral type | G2V [3] |
Apparent magnitude (B) | 8.577 [2] |
Apparent magnitude (R) | 7.71 [2] |
Apparent magnitude (J) | 6.839±0.019 [2] |
Apparent magnitude (H) | 6.577±0.034 [2] |
Apparent magnitude (K) | 6.463±0.023 [2] |
B−V color index | 0.647±0.014 [2] |
V−R color index | 0.22 [4] |
Astrometry | |
Radial velocity (Rv) | +19.56±0.19 [4] km/s |
Proper motion (μ) |
RA: –177.127
mas/
yr
[1] Dec.: +47.099 mas/ yr [1] |
Parallax (π) | 21.9301 ± 0.0267 mas [1] |
Distance | 148.7 ± 0.2
ly (45.60 ± 0.06 pc) |
Absolute magnitude (MV) | 4.66 [2] |
Details [5] | |
Mass | 1.019+0.061 −0.066 M☉ |
Radius | 1.053+0.026 −0.026 R☉ |
Luminosity | 1.180+0.036 −0.029 L☉ |
Surface gravity (log g) | 4.400+0.029 −0.032 cgs |
Temperature | 5863±88 K |
Metallicity [Fe/H] | 0.018+0.057 −0.043 dex |
Rotational velocity (v sin i) | 3.6 [6] km/s |
Age | 4.6+3.7 −2.7 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 86226 is a star with a pair of orbiting exoplanet companions, found in the constellation of Hydra. With an apparent visual magnitude of 7.93, [2] it is too dim to be visible with the naked eye. The distance to this system has been determined by the parallax method, yielding a range of 149 light years. It is receding with a heliocentric radial velocity of +19.6 km/s. [4] A survey in 2015 has ruled out the existence of any stellar companions at projected distances above 12 astronomical units. [8]
This is an ordinary G-type main-sequence star with a stellar classification of G2V. [3] It is similar in size, mass, and composition to the Sun, [5] although it isn't considered a solar twin. [9] The age is about the same; roughly 4.6 billion years old. The star is radiating 18% greater luminosity (compared to the Sun) from its photosphere at an effective temperature of 5,863 K. [5] It is spinning with a projected rotational velocity of 3.6 km/s. [6]
As of 2014 [update], Radio emission at a frequency of 150 MHz has been tentatively detected from the proximity of this system, although it is not clear whether the star or a satellite orbiting a rapidly rotating planet is the source. [10]
Due to the periodic spectrum shifts when it had when placed under a Doppler test, 13 Magellan Doppler Velocity observations were made of an object found near the star. The object discovered in 2010 had a Keplerian orbit, was declared an exoplanet and dubbed HD 86226 b. [11] A hot Super-Earth planet called HD 86226 c was discovered in 2020. [5] It may be undergoing considerable atmospheric mass loss. [12]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
c | 7.25+1.19 −1.12 M🜨 |
0.049±0.001 | 3.98442±0.00018 | 0.075+0.065 −0.048 |
86.45+0.26 −0.16 ° |
2.16±0.08 R🜨 |
b | 0.45+0.04 −0.05 MJ |
2.73±0.06 | 1628+22 −21 |
0.059+0.062 −0.039 |
— | — |