Key parameters at a glance
- A radius of 12.50 Earth radii
- A mass of 2,892.24 Earth masses
- Surface gravity around 18.51 g
- An orbital period of 5,163.000 days
- Semi-major axis 7.4600 AU
- Distance from Earth 329.24 light-years
- Earth Similarity Index 0.396
- Travel time at Voyager 1 speed 5,806,230 years
HD 154391 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1235of 1771
top 69.7%
This planet
12.50R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 154391 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.50 | 11.21 |
| Mass (M⊕) | 1.00 | 2,892.24 | 317.83 |
| Density (g/cm³) | 5.51 | 8.14 | 1.33 |
| Surface Gravity (g) | 1.00 | 18.51 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 2,892.239 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 2,094.489 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 154391
HIP
HIP 83289
TIC
TIC 424731682
Gaia DR2
Gaia DR2 1438038102484626048
Gaia DR3
Gaia DR3 1438038102484626048
System
HD 154391
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 14.14 Earth years on a mildly elliptical path at a mean orbital distance of 7.4600 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.396
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
Xiao et al. 2023Instrument
Multiple Instruments
Publication
2023-12
Observation locale
Multiple Locales
Discovery cohort
Planets confirmed in 2023 at Multiple Observatories (12 shown).
Host System: HD 154391
Spectral Class
K-type orange
Effective Temperature
4,909 K — cooler than the Sun (5,778 K)
Estimated Age
1.10 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
8.560 R☉
Stellar Mass
2.070 M☉
Metallicity [Fe/H]
0.10
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
9.877 mas
Total Proper Motion
59.144 mas/yr
PM Right Ascension
-44.48 mas/yr
PM Declination
38.98 mas/yr
Galactic Cartesian (pc)
x = -0.124 · y = -0.474 · z = 0.872
Equatorial (J2000)
RA 255.32013° · Dec 60.64892°
Galactic ℓ, b
90.055° · 36.809°
Ecliptic λ, β
215.409° · 81.233°
HTM-20 index
-2034362303
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