Space Codex / Exoplanet reference
Published exoplanet measurements
LP 791-18 b
LP 791-18 b orbits LP 791-18 once every 0.947998 days. The system is about 86.4076 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 0.947998 days, or 0.00259548 Earth years. Its reported semimajor axis is 0.00978 AU. That orbital scale is 0.0252649 times Mercury's semimajor axis. 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 1.212 (+0.059 / −0.058) Earth radii. Radius describes size; it does not specify the mass or the atmospheric composition. No mass parameter is supplied in this solution, so this record cannot establish bulk composition from size and mass together.
The host star and received light
The host is cataloged as LP 791-18. The selected row gives spectral type M(6.1 +/- 0.7) V. Its reported effective temperature is 2960 K. Its reported radius is 0.182 solar radii. Its reported mass is 0.139 solar masses. The planet's incident-flux parameter is 24.14 (+0.61 / −0.57) times Earth's received stellar flux. The equilibrium-temperature entry is 564.3 (+3.5 / −3.4) 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 LP 791-18
The fetched archive contains 3 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 |
|---|---|---|---|---|
| LP 791-18 b | 0.947998 (+2.1e-06 / −2.1e-06) | 1.212 (+0.059 / −0.058) | Not reported in this solution | Not specified |
| LP 791-18 d | 2.75485 (+0.00013 / −0.00013) | 1.032 (+0.044 / −0.043) | 0.91 (+0.19 / −0.19) | Mass |
| LP 791-18 c | 4.98991 (+1.2e-06 / −1.4e-06) | 2.488 (+0.096 / −0.096) | 7.16 (+0.65 / −0.65) | Mass |
Earth comparison
| Quantity | Reported value or conversion | Comparison |
|---|---|---|
| Orbital period | 0.947998 days | 0.00259548 Earth years |
| System distance | 26.4927 parsecs | 86.4076 light-years |
| Orbital scale | 0.00978 (+0.00012 / −0.00012) | AU; Earth = 1 |
| Radius | 1.212 (+0.059 / −0.058) | Earth radii; Earth = 1 |
| Received stellar flux | 24.14 (+0.61 / −0.57) | 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 | 0.947998 (+2.1e-06 / −2.1e-06) | days |
| Semimajor axis | 0.00978 (+0.00012 / −0.00012) | AU |
| Radius | 1.212 (+0.059 / −0.058) | Earth radii |
| Mass parameter | Not reported in this solution | Earth masses |
| Orbital eccentricity | Not reported in this solution | dimensionless |
| Orbital inclination | 88.37 (+0.94 / −0.95) | degrees |
| Equilibrium temperature | 564.3 (+3.5 / −3.4) | K; model estimate |
| Incident flux | 24.14 (+0.61 / −0.57) | Earth flux |
| Bulk density | Not reported in this solution | g/cm³ |
| Host effective temperature | 2960 (+55 / −55) | K |
| Host radius | 0.182 (+0.007 / −0.007) | solar radii |
| Host mass | 0.139 (+0.005 / −0.005) | solar masses |
| Host metallicity | -0.09 (+0.19 / −0.19) | dex; archive abundance definition |
| Host age | Lower limit: 0.5 | billion years |
| Host luminosity | -2.63827 (+0.00188 / −0.00189) | log10 solar luminosity |
| Host surface gravity | 5.115 (+0.094 / −0.094) | log10 cm/s² |
| Host rotation period | Not reported in this solution | days |
| System distance | 26.4927 (+0.064 / −0.0638) | 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 | Peterson et al. 2023 |
| Discovery method | Transit |
| Discovery year | 2019 |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Mass provenance | Not specified |
| Host stars in system | 1 |
| Archive system planet count | 3 |
| Planetary solution publication date | 2023-05 |
| Row update date | 2023-05-14 |
| Archive release date | 2023-05-14 |
Source: NASA Exoplanet Archive overview for LP 791-18 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.