Space Codex / Exoplanet reference
Published exoplanet measurements
HD 219134 d
HD 219134 d orbits HD 219134 once every 46.859 days. The system is about 21.3022 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 46.859 days, or 0.128293 Earth years. Its reported semimajor axis is 0.237 AU. That orbital scale is 0.612248 times Mercury's semimajor axis. The listed eccentricity is 0.138. Using those central values, the model's nearest and farthest star–planet distances are about 0.204294 and 0.269706 AU. These are derived comparisons, without propagated errors. 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 Lower limit: 1.61 Earth radii. Radius describes size; it does not specify the mass or the atmospheric composition. The mass parameter is Lower limit: 16.17 Earth masses. Its archive provenance is Mass.
The host star and received light
The host is cataloged as HD 219134. Its reported effective temperature is 4699 K. Its reported radius is 0.778 solar radii. Its reported mass is 0.81 solar masses. The planet's incident-flux parameter is 4.72 (+0.15 / −0.15) times Earth's received stellar flux. The equilibrium-temperature entry is 410.5 (+3.2 / −3.2) K. This is a model quantity, not a measured surface temperature. 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 219134
The fetched archive contains 4 selected default planet records 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 219134 b | 3.09293 (+1e-05 / −1e-05) | 1.602 (+0.055 / −0.055) | 4.74 (+0.19 / −0.19) | Mass |
| HD 219134 c | 6.76458 (+0.00033 / −0.00033) | 1.511 (+0.047 / −0.047) | 4.36 (+0.22 / −0.22) | Mass |
| HD 219134 d | 46.859 (+0.028 / −0.028) | Lower limit: 1.61 | Lower limit: 16.17 | Mass |
| HD 219134 h | 2247 (+43 / −43) | Not reported in this solution | 108.062 (+6.3566 / −6.3566) | Msini |
Earth comparison
| Quantity | Reported value or conversion | Comparison |
|---|---|---|
| Orbital period | 46.859 days | 0.128293 Earth years |
| System distance | 6.53127 parsecs | 21.3022 light-years |
| Orbital scale | 0.237 (+0.003 / −0.003) | AU; Earth = 1 |
| Radius | Lower limit: 1.61 | Earth radii; Earth = 1 |
| Mass parameter | Lower limit: 16.17 | Earth masses; check mass definition |
| Received stellar flux | 4.72 (+0.15 / −0.15) | Earth flux; Earth = 1 |
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 | 46.859 (+0.028 / −0.028) | days |
| Semimajor axis | 0.237 (+0.003 / −0.003) | AU |
| Radius | Lower limit: 1.61 | Earth radii |
| Mass parameter | Lower limit: 16.17 | Earth masses |
| Orbital eccentricity | 0.138 (+0.025 / −0.025) | dimensionless |
| Orbital inclination | Not reported in this solution | degrees |
| Equilibrium temperature | 410.5 (+3.2 / −3.2) | K; model estimate |
| Incident flux | 4.72 (+0.15 / −0.15) | Earth flux |
| Bulk density | Not reported in this solution | g/cm³ |
| Host effective temperature | 4699 (+16 / −16) | K |
| Host radius | 0.778 (+0.005 / −0.005) | solar radii |
| Host mass | 0.81 (+0.03 / −0.03) | solar masses |
| Host metallicity | 0.11 (+0.04 / −0.04) | dex; archive abundance definition |
| Host age | 11 (+2.2 / −2.2) | billion years |
| Host luminosity | -0.57741 (+0.00813 / −0.00829) | log10 solar luminosity |
| Host surface gravity | 4.567 (+0.018 / −0.018) | log10 cm/s² |
| Host rotation period | Not reported in this solution | days |
| System distance | 6.53127 (+0.00384 / −0.00385) | 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 | Gillon et al. 2017 |
| Discovery method | Radial Velocity |
| Discovery year | 2015 |
| Discovery facility | Roque de los Muchachos Observatory |
| Mass provenance | Mass |
| Host stars in system | 1 |
| Archive system planet count | 6 |
| Planetary solution publication date | 2017-03 |
| Row update date | 2017-03-14 |
| Archive release date | 2017-03-16 |
Source: NASA Exoplanet Archive overview for HD 219134 d, 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.