Space Codex / Exoplanet reference
Published exoplanet measurements
HD 189733 b
HD 189733 b orbits HD 189733 once every 2.21858 days. The system is about 64.4609 light-years from Earth.
Archive retrieved November 1, 2026 (America/New_York). The selected paper and archive update dates appear below.
The recorded orbit
The selected archive solution gives an orbital period of 2.21858 days, or 0.00607413 Earth years. The listed eccentricity is 0. A zero may be a circular assumption fixed in the fit; consult the paper before treating it as an exact observed shape. The period measures a year on this planet. It does not establish the length of its rotation or the duration of daylight.
Read how orbital period, size, and eccentricity fit together.
Size and mass
The radius parameter is 12.6662 (+0.11209 / −0.11209) Earth radii. Radius describes size; it does not specify the mass or the atmospheric composition. The mass parameter is 359.148 (+25.4264 / −25.4264) Earth masses. Its archive provenance is Mass.
The host star and received light
The host is cataloged as HD 189733. Its reported effective temperature is 5052 K. Its reported radius is 0.75 solar radii. Its reported mass is 0.79 solar masses. The available stellar and orbital entries do not establish a breathable atmosphere, surface water, or life.
What a habitable-zone claim does and does not mean · How a star changes over time.
Other planets around HD 189733
The fetched archive contains 1 selected default planet record for this host. This is the retrieved record set, and additional or revised discoveries may appear in later research.
| Planet | Period (days) | Radius (Earth) | Mass parameter (Earth) | Mass definition |
|---|---|---|---|---|
| HD 189733 b | 2.21858 (+1.5e-07 / −1.5e-07) | 12.6662 (+0.11209 / −0.11209) | 359.148 (+25.4264 / −25.4264) | Mass |
Earth comparison
| Quantity | Reported value or conversion | Comparison |
|---|---|---|
| Orbital period | 2.21858 days | 0.00607413 Earth years |
| System distance | 19.7638 parsecs | 64.4609 light-years |
| Radius | 12.6662 (+0.11209 / −0.11209) | Earth radii; Earth = 1 |
| Mass parameter | 359.148 (+25.4264 / −25.4264) | Earth masses; check mass definition |
Conversions use rounded central values. They are navigation aids for the data, not additional observations. Uncertainties for the original parameters remain in the next table.
Measurement table
| Parameter | Value and reported uncertainty | Unit or definition |
|---|---|---|
| Orbital period | 2.21858 (+1.5e-07 / −1.5e-07) | days |
| Semimajor axis | Not reported in this solution | AU |
| Radius | 12.6662 (+0.11209 / −0.11209) | Earth radii |
| Mass parameter | 359.148 (+25.4264 / −25.4264) | Earth masses |
| Orbital eccentricity | 0 | dimensionless |
| Orbital inclination | 85.71 (+0 / −0) | degrees |
| Equilibrium temperature | Not reported in this solution | K; model estimate |
| Incident flux | Not reported in this solution | Earth flux |
| Bulk density | Not reported in this solution | g/cm³ |
| Host effective temperature | 5052 (+16 / −16) | K |
| Host radius | 0.75 (+0.01 / −0.01) | solar radii |
| Host mass | 0.79 (+0.08 / −0.08) | solar masses |
| Host metallicity | -0.02 | dex; archive abundance definition |
| Host age | Not reported in this solution | billion years |
| Host luminosity | Not reported in this solution | log10 solar luminosity |
| Host surface gravity | 4.49 (+0.05 / −0.05) | log10 cm/s² |
| Host rotation period | Not reported in this solution | days |
| System distance | 19.7638 (+0.0128 / −0.0127) | parsecs |
Parentheses show the reported upper and lower uncertainties when both are supplied. Bounds are explicitly labeled. A missing entry means unavailable in this solution, not zero. The confidence convention belongs to the source paper.
Research record and limitations
| Record | Value |
|---|---|
| Planetary reference | Stassun et al. 2017 |
| Discovery method | Radial Velocity |
| Discovery year | 2005 |
| Discovery facility | Haute-Provence Observatory |
| Mass provenance | Mass |
| Host stars in system | 2 |
| Archive system planet count | 1 |
| Planetary solution publication date | 2017-03 |
| Row update date | 2018-12-03 |
| Archive release date | 2018-12-06 |
Source: NASA Exoplanet Archive overview for HD 189733 b, Planetary Systems table, default solution. The collection excludes entries flagged controversial at retrieval. A selected default is a published reference choice, not a claim that every parameter is the latest estimate in all literature.
This profile documents measurements and their scope. It is separate from the 3D planet catalog and does not create a sponsorship placement or a new explorer destination.