| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 23m 21.5637s[1] |
| Declination | −02° 16′ 39.433″[1] |
| Apparent magnitude (V) | 8.99[2] |
| Characteristics | |
| Spectral type | G5IV[3] or G8V[4] |
| Apparent magnitude (B) | 9.751[2] |
| Apparent magnitude (J) | 7.683±0.026[2] |
| Apparent magnitude (H) | 7.404±0.047[2] |
| Apparent magnitude (K) | 7.271±0.027[2] |
| B−Vcolor index | 0.761±0.033[2] |
| Astrometry | |
| Radial velocity (Rv) | +29.52±0.17[1] km/s |
| Proper motion (μ) | RA: 32.478(19)mas/yr[1] Dec.: −97.255(13)mas/yr[1] |
| Parallax (π) | 17.9008±0.0196 mas[1] |
| Distance | 182.2 ± 0.2 ly (55.86 ± 0.06 pc) |
| Absolute magnitude (MV) | 5.24[2] |
| Details[5] | |
| 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[4] km/s |
| Age | 11.8±1.2 Gyr |
| Other designations | |
| BD−02°128,HD 290327,HIP 25191,SAO 132049,PPM 175811[6] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 290327 is a single[7]star in theequatorialconstellation ofOrion. It has a yellow hue with anapparent visual magnitude of 8.99,[2] 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 aradial velocity of +29.5 km/s,[1] having come to within 124 light-years around a million years ago.[2]
Kazanasmas (1973) found astellar classification of G5IV[3] for this object, matching aG-type star that isevolving along thesubgiant branch. It was later given a class of G8V,[4] suggesting it is instead aG-type main-sequence star. This object is nearly twelve[5] billion years old and is spinning slowly with aprojected rotational velocity of 1.4 km/s.[4] The star has 86% of themass of the Sun and 95% of theSun's radius. It is radiating 75% of theluminosity of the Sun from itsphotosphere at aneffective temperature of 5,525 K. Themetallicity is sub-solar,[5] meaning it has a lower abundance of elements other than hydrogen and helium compared to the Sun.
In 2009, agas giant planet was found in orbit around the star. It is orbiting at a distance of around3.4 AU with aperiod of 6.7 years.[4]
| 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 | — | — |
