Key parameters at a glance
- A mass of 1,708.65 Earth masses
- An orbital period of 9.375 days
- Semi-major axis 0.0828 AU
- Distance from Earth 87.66 light-years
- Travel time at Voyager 1 speed 1,545,855 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around HD 181433
HD 181433 b shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| HD 181433 b this | Unclassified | — | 1,708.65 | 9.375 | — | 2008 |
| HD 181433 c | Unclassified | — | 2,207.00 | 1,018.500 | — | 2008 |
| HD 181433 d | Gas Giant | 13.20 | 858.14 | 6,896.100 | — | 2008 |
HD 181433 b Planet Profile
Physical Specs
Classification
Planet Type
Unclassified
Discovery
| Metric | Earth | HD 181433 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | — | 11.21 |
| Mass (M⊕) | 1.00 | 1,708.65 | 317.83 |
| Density (g/cm³) | 5.51 | — | 1.33 |
| Surface Gravity (g) | 1.00 | — | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,708.646 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 7.220 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 181433
HIP
HIP 95467
TIC
TIC 410399074
Gaia DR2
Gaia DR2 6434153380720177664
Gaia DR3
Gaia DR3 6434153380720177664
System
HD 181433
Percentile among Unclassified cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.37 Earth days (2.6% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0828 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
—
0 = alien, 1 = Earth-identical
Insufficient insolation data. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Bouchy et al. 2009Instrument
HARPS Spectrograph
Publication
2009-03
Observation locale
Ground
Discovery cohort
Planets confirmed in 2008 at La Silla Observatory (12 shown).
Host System: HD 181433
Spectral Class
K-type orange
Effective Temperature
4,918 K — cooler than the Sun (5,778 K)
Estimated Age
6.70 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.790 R☉
Stellar Mass
0.860 M☉
Metallicity [Fe/H]
0.40
Extended Stellar Properties
Surface gravity (log g)
4.450 dex
Stellar density
2.142 g/cm³
Systemic radial velocity
39.78 km/s
Rotational v·sin i
1.50 km/s
Rotation period
54.00 days
Metallicity ratio
[M/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
37.179 mas
Total Proper Motion
330.029 mas/yr
PM Right Ascension
-230.93 mas/yr
PM Declination
235.78 mas/yr
Galactic Cartesian (pc)
x = 0.145 · y = -0.372 · z = -0.917
Equatorial (J2000)
RA 291.28737° · Dec -66.46778°
Galactic ℓ, b
329.515° · -28.044°
Ecliptic λ, β
281.598° · -43.884°
HTM-20 index
1546352008
Observation Record
Photometric series
1
RV measurements
1
Archive notes
1
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