HD 290327
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 23m 21.5637s |
| Declination | −02° 16′ 39.433″ |
| Apparent magnitude (V) | 8.99 |
| Characteristics | |
| Spectral type | G5IV or G8V |
| Apparent magnitude (B) | 9.751 |
| Apparent magnitude (J) | 7.683±0.026 |
| Apparent magnitude (H) | 7.404±0.047 |
| Apparent magnitude (K) | 7.271±0.027 |
| B−V color index | 0.761±0.033 |
| Astrometry | |
| Radial velocity (Rv) | +29.52±0.17 km/s |
| Proper motion (μ) | RA: 32.478(19) mas/yr Dec.: −97.255(13) mas/yr |
| Parallax (π) | 17.9008±0.0196 mas |
| Distance | 182.2 ± 0.2 ly (55.86 ± 0.06 pc) |
| Absolute magnitude (MV) | 5.24 |
| Details | |
| Mass | 0.86±0.01 M☉ |
| Radius | 0.95±0.02 R☉ |
| Luminosity | 0.747±0.004 L☉ |
| Surface gravity (log g) | 4.41±0.01 cgs |
| Temperature | 5,525±20 K |
| Metallicity [Fe/H] | −0.11 dex |
| Rotational velocity (v sin i) | 1.44±1.0 km/s |
| Age | 11.8±1.2 Gyr |
| Other designations | |
| BD−02°128, HD 290327, HIP 25191, SAO 132049, PPM 175811 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 290327 is a single star in the equatorial constellation of Orion. It has a yellow hue with an apparent visual magnitude of 8.99, which is too faint to be viewed with the naked eye. Parallax measurements provide a distance estimate of 182 light years from the Sun. It is drifting away with a radial velocity of +29.5 km/s, having come to within 124 light-years around a million years ago.
Kazanasmas (1973) found a stellar classification of G5IV for this object, matching a G-type star that is evolving along the subgiant branch. It was later given a class of G8V, suggesting it is instead a G-type main-sequence star. This object is nearly twelve billion years old and is spinning slowly with a projected rotational velocity of 1.4 km/s. The star has 86% of the mass of the Sun and 95% of the Sun's radius. It is radiating 75% of the luminosity of the Sun from its photosphere at an effective temperature of 5,525 K. The metallicity is sub-solar, meaning it has a lower abundance of elements other than hydrogen and helium compared to the Sun.
In 2009, a gas giant planet was found in orbit around the star. It is orbiting at a distance of around 3.4 AU with a period of 6.7 years.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥ 2.54+0.17 −0.14 MJ |
3.43+0.20 −0.12 |
2443+205 −117 |
0.08+0.08 −0.03 |
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