HD 46375
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 33m 12.62233s[1] |
| Declination | +05° 27′ 46.5283″[1] |
| Apparent magnitude (V) | 7.84 |
| Characteristics | |
| Spectral type | K1 IV[2] |
| Astrometry | |
| Radial velocity (Rv) | –1.6[3] km/s |
| Proper motion (μ) | RA: +111.96[1] mas/yr Dec.: –97.17[1] mas/yr |
| Parallax (π) | 28.72 ± 0.89[1] mas |
| Distance | 114 ± 4 ly (35 ± 1 pc) |
| Details | |
| Temperature | 3,663 ± 15[4] K |
| Metallicity [Fe/H] | +0.29 ± 0.17[4] dex |
| Rotational velocity (v sin i) | 0.86[5] km/s |
| Other designations | |
HD 46375 is an 8th-magnitude K-type subgiant star located approximately 109 light-years away in the constellation of Monoceros. This star resembles an orange dwarf but has a larger radius and luminosity, indicating that fusion reactions in its core are starting to cease and the star is on its way becoming a red giant. The spectral type of the star is K1 IV. Its advanced evolutionary stage shows that it is considerably older than the Sun.
This star has sometimes been classified as a member of the NGC 2244 star cluster in the Rosette Nebula, but in reality it just happens to lie in the foreground. The distance to the cluster is much greater, about 4500 light-years.
In 2000, a low-mass gas giant was found orbiting the star.
Planetary system
On March 29, 2000, the planet HD 46375 b with only three quarters the mass of Saturn was discovered by Marcy, Butler, and Vogt in California, together with 79 Ceti b.[6] This planet was discovered using the "wobble method" or radial velocity method, which calculates the rate and shape of the stellar wobble caused by the revolving planet's gravity.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.226 ± 0.019 MJ | 0.0398 ± 0.0023 | 3.023573 ± 0.000065 | 0.063 ± 0.026 | — | — |
See also
References
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External links
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Coordinates: 
06h 33m 12.6237s, +05° 27′ 46.532″
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