Key parameters at a glance
- A radius of 13.70 Earth radii
- A mass of 384.57 Earth masses
- Surface gravity around 2.05 g
- An orbital period of 487.080 days
- Semi-major axis 1.3200 AU
- Distance from Earth 287.27 light-years
- Earth Similarity Index 0.324
- Travel time at Voyager 1 speed 5,065,978 years
1 sibling around HIP 111909
HIP 111909 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| HIP 111909 b this | Gas Giant | 13.70 | 384.57 | 487.080 | — | 2025 |
| HIP 111909 c | Gas Giant | 13.90 | 257.44 | 893.630 | — | 2025 |
HIP 111909 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#554of 1771
top 31.2%
This planet
13.70R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HIP 111909 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.70 | 11.21 |
| Mass (M⊕) | 1.00 | 384.57 | 317.83 |
| Density (g/cm³) | 5.51 | 0.82 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.05 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 384.572 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HIP
HIP 111909
TIC
TIC 161173454
Gaia DR2
Gaia DR2 6517272336609082880
Gaia DR3
Gaia DR3 6517272336609082880
System
HIP 111909
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 1.33 Earth years at a mean orbital distance of 1.3200 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.324
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Jenkins et al. 2025Instrument
Multiple Instruments
Publication
2025-09
Observation locale
Ground
Discovery cohort
Planets confirmed in 2025 at Multiple Observatories (12 shown).
Host System: HIP 111909
Spectral Class
K-type orange
Effective Temperature
4,891 K — cooler than the Sun (5,778 K)
Estimated Age
4.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
4.530 R☉
Stellar Mass
1.280 M☉
Metallicity [Fe/H]
-0.01
Extended Stellar Properties
Surface gravity (log g)
3.090 dex
Rotational v·sin i
3.13 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
11.325 mas
Total Proper Motion
100.298 mas/yr
PM Right Ascension
77.65 mas/yr
PM Declination
-63.49 mas/yr
Galactic Cartesian (pc)
x = 0.609 · y = -0.221 · z = -0.762
Equatorial (J2000)
RA 340.03044° · Dec -49.59854°
Galactic ℓ, b
342.225° · -56.300°
Ecliptic λ, β
320.282° · -37.635°
HTM-20 index
968676626
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