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Star with a planetary system in the constellation Triangulum From Wikipedia, the free encyclopedia
HD 9446 is a star located about 164[1] light-years away in the constellation of Triangulum, near the southwestern constellation border with Pisces. This object can be viewed with binoculars or a telescope, but it is too faint to be seen with the naked eye at its apparent visual magnitude of 8.35.[2] It is drifting further away from the Sun with a radial velocity of +21 km/s.[2]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Triangulum |
Right ascension | 01h 33m 20.1847s[1] |
Declination | +29° 15′ 54.539″[1] |
Apparent magnitude (V) | 8.35[2] |
Characteristics | |
Spectral type | G5V[3] |
B−V color index | +0.680±0.015[2] |
Astrometry | |
Radial velocity (Rv) | +21.2±3.1[2] km/s |
Proper motion (μ) | RA: 190.343(28) mas/yr Dec.: −53.675(31) mas/yr |
Parallax (π) | 19.9200 ± 0.0413 mas[1] |
Distance | 163.7 ± 0.3 ly (50.2 ± 0.1 pc) |
Absolute magnitude (MV) | 4.76[2] |
Details[3] | |
Mass | 1.00±0.10 M☉ |
Radius | 1.00 R☉ |
Luminosity | 1.1 L☉ |
Surface gravity (log g) | 4.53±0.16 cgs |
Temperature | 5,793±22 K |
Metallicity [Fe/H] | 0.09±0.05 dex |
Rotational velocity (v sin i) | 4±1 km/s |
Age | 2.0±1.5[4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
This object is a G-type main sequence star with a stellar classification of G5V.[3] The physical properties this star appear similar to the Sun, making it a candidate solar analog. However, the measured abundance of elements with more mass than helium is outside the accepted range.[6] It is roughly two billion years in age and has an active chromosphere. The amount of activity measured in the chromosphere corresponds to a star with a rotation period of about 10 days.[3]
On 5 January 2010, scientists announced the discovery of two planets orbiting around HD 9446.[3]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥ 0.687±0.0056 MJ | 0.1892±0.0065 | 30.0608+0.0034 −0.0033 |
0.20±0.06 | — | — |
c | ≥ 1.71±0.13 MJ | 0.646±0.022 | 189.6±0.13 | 0.06±0.06 | — | — |
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