Key parameters at a glance
- A mass of 2,207.00 Earth masses
- An orbital period of 1,018.500 days
- Semi-major axis 1.8850 AU
- Distance from Earth 87.66 light-years
- Travel time at Voyager 1 speed 1,545,855 years
2 siblings around HD 181433
HD 181433 c 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 | Unclassified | — | 1,708.65 | 9.375 | — | 2008 |
| HD 181433 c this | Unclassified | — | 2,207.00 | 1,018.500 | — | 2008 |
| HD 181433 d | Gas Giant | 13.20 | 858.14 | 6,896.100 | — | 2008 |
HD 181433 c Planet Profile
Physical Specs
Classification
Planet Type
Unclassified
Discovery
| Metric | Earth | HD 181433 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | — | 11.21 |
| Mass (M⊕) | 1.00 | 2,207.00 | 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 | 2,207.000 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 235.500 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 about 2.79 Earth years on a mildly elliptical path at a mean orbital distance of 1.8850 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
—
0 = alien, 1 = Earth-identical
Detection Signatures
Radial velocity
Stellar wobble has been measured spectroscopically.
Astrometry
Positional wobble of the host star was measured.
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
Similar Worlds
BD-08 2823 b
Unclassified · K-type orange
Radius — R⊕ · 134.8 ly
HD 181433 b
Unclassified · K-type orange
Radius — R⊕ · 87.7 ly
HD 215152 c
Unclassified · K-type orange
Radius — R⊕ · 70.4 ly
BD+05 4868 A b
Unclassified · K-type orange
Radius — R⊕ · 142.1 ly
WASP-53 c
Unclassified · K-type orange
Radius — R⊕ · 656.7 ly
HD 40307 c
Unclassified · K-type orange
Radius — R⊕ · 42.2 ly