Key parameters at a glance
- A radius of 2.47 Earth radii
- A mass of 9.70 Earth masses
- Surface gravity around 1.59 g
- An orbital period of 9.100 days
- Semi-major axis 0.0792 AU
- Equilibrium temperature 753 K (480 °C)
- Distance from Earth 203.68 light-years
- Earth Similarity Index 0.353
- Travel time at Voyager 1 speed 3,591,923 years
- Almost certainly tidally locked to its host star given the close orbit
HIP 116454 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1241of 1978
top 62.7%
This planet
2.47R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | HIP 116454 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.47 | 11.21 |
| Mass (M⊕) | 1.00 | 9.70 | 317.83 |
| Density (g/cm³) | 5.51 | 3.53 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.59 | 2.53 |
| Insolation (S⊕) | 1.00 | 51.29 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 9.700 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HIP
HIP 116454
TIC
TIC 422618449
Gaia DR2
Gaia DR2 2645940376800212096
Gaia DR3
Gaia DR3 2645940376800212096
System
HIP 116454
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.10 Earth days (2.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0792 AU.
Transit Fingerprint
Depth
0.089 %
Duration
2.431 h
Impact parameter b
0.340
Rp / R★
0.029810
Transit midpoint (BJD)
2,458,072.2929
Photometric dip
Transit produces a flux drop of 889 ppm lasting ≈ 2.43 h.
Extended Orbital Architecture
Planet / star radius ratio
0.029810
Semi-major axis / stellar radius
22.460
Impact parameter (b)
0.340
RV semi-amplitude (K)
3.540 m/s
Transit mid-time (BJD)
2,458,072.2929
Long. of periastron (ω)
88.00°
Angular separation (arcsec)
1.27000
Eq. Temperature
753K
(480 °C)
Insolation (S⊕)
51.29
Earth = 1.00
Earth Similarity (ESI)
0.353
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Vanderburg et al. 2015Instrument
Kepler CCD Array
Publication
2015-02
Observation locale
Space
Host System: HIP 116454
Spectral Class
K-type orange
Effective Temperature
5,048 K — cooler than the Sun (5,778 K)
Estimated Age
5.50 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.758 R☉
Stellar Mass
0.800 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.582 dex
Stellar density
2.590 g/cm³
Systemic radial velocity
-3.06 km/s
Rotational v·sin i
2.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 13 bands
Astrometric Data
Parallax
15.984 mas
Total Proper Motion
299.043 mas/yr
PM Right Ascension
-232.91 mas/yr
PM Declination
-187.56 mas/yr
Galactic Cartesian (pc)
x = 0.994 · y = -0.105 · z = 0.008
Equatorial (J2000)
RA 353.95435° · Dec 0.44470°
Galactic ℓ, b
86.459° · -56.973°
Ecliptic λ, β
354.622° · 2.809°
HTM-20 index
1326943573
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