Key parameters at a glance
- A radius of 4.27 Earth radii
- A mass of 42.90 Earth masses
- Surface gravity around 2.35 g
- An orbital period of 55.083 days
- Semi-major axis 0.2620 AU
- Equilibrium temperature 443 K (170 °C)
- Distance from Earth 120.66 light-years
- Earth Similarity Index 0.524
- Travel time at Voyager 1 speed 2,127,812 years
HD 95338 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#503of 574
top 87.5%
This planet
4.27R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | HD 95338 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.27 | 11.21 |
| Mass (M⊕) | 1.00 | 42.90 | 317.83 |
| Density (g/cm³) | 5.51 | 3.98 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.35 | 2.53 |
| Insolation (S⊕) | 1.00 | 7.42 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 42.900 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 95338
HIP
HIP 53719
TIC
TIC 304142124
Gaia DR2
Gaia DR2 5340648488081462528
Gaia DR3
Gaia DR3 5340648488081462528
System
HD 95338
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 55.08 Earth days (15.1% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.2620 AU.
Transit Fingerprint
Depth
0.251 %
Duration
5.587 h
Impact parameter b
0.370
Rp / R★
0.044130
Transit midpoint (BJD)
2,458,585.2809
Photometric dip
Transit produces a flux drop of 2,509 ppm lasting ≈ 5.59 h.
Extended Orbital Architecture
Planet / star radius ratio
0.044130
Semi-major axis / stellar radius
67.340
Impact parameter (b)
0.370
RV semi-amplitude (K)
8.170 m/s
Transit mid-time (BJD)
2,458,585.2809
Long. of periastron (ω)
23.42°
Angular separation (arcsec)
7.08000
Eq. Temperature
443K
(170 °C)
Insolation (S⊕)
7.42
Earth = 1.00
Earth Similarity (ESI)
0.524
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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
D Iacute Az et al. 2020Instrument
Carnegie Planet Finder Spectrograph
Publication
2020-06
Observation locale
Ground
Host System: HD 95338
Spectral Class
K-type orange
Effective Temperature
5,097 K — cooler than the Sun (5,778 K)
Estimated Age
9.50 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.868 R☉
Stellar Mass
0.848 M☉
Metallicity [Fe/H]
0.08
Extended Stellar Properties
Surface gravity (log g)
4.440 dex
Stellar density
1.687 g/cm³
Systemic radial velocity
96.58 km/s
Rotational v·sin i
1.23 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
27.003 mas
Total Proper Motion
433.727 mas/yr
PM Right Ascension
-416.88 mas/yr
PM Declination
-119.71 mas/yr
Galactic Cartesian (pc)
x = -0.531 · y = 0.144 · z = -0.835
Equatorial (J2000)
RA 164.85634° · Dec -56.62356°
Galactic ℓ, b
287.942° · 2.953°
Ecliptic λ, β
200.663° · -55.420°
HTM-20 index
-382745746
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