Key parameters at a glance
- A radius of 2.87 Earth radii
- A mass of 8.62 Earth masses
- Surface gravity around 1.05 g
- An orbital period of 7.760 days
- Semi-major axis 0.0630 AU
- Distance from Earth 61.05 light-years
- Earth Similarity Index 0.655
- Travel time at Voyager 1 speed 1,076,546 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around HIP 54373
HIP 54373 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 54373 b this | Sub-Neptune | 2.87 | 8.62 | 7.760 | — | 2019 |
| HIP 54373 c | Sub-Neptune | 3.57 | 12.44 | 15.144 | — | 2019 |
HIP 54373 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#659of 1978
top 33.3%
This planet
2.87R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | HIP 54373 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.87 | 11.21 |
| Mass (M⊕) | 1.00 | 8.62 | 317.83 |
| Density (g/cm³) | 5.51 | 2.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.05 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 8.620 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HIP
HIP 54373
TIC
TIC 410407964
Gaia DR2
Gaia DR2 3552000252294347392
Gaia DR3
Gaia DR3 3552000252294347392
System
HIP 54373
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.76 Earth days (2.1% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0630 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.655
0 = alien, 1 = Earth-identical
Insufficient insolation data. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Feng et al. 2019Instrument
Carnegie Planet Finder Spectrograph
Publication
2019-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 2019 at Las Campanas Observatory (12 shown).
Host System: HIP 54373
Spectral Class
K-type orange
Effective Temperature
4,021 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.565 R☉
Stellar Mass
0.570 M☉
Metallicity [Fe/H]
—
Extended Stellar Properties
Surface gravity (log g)
4.681 dex
Stellar density
4.366 g/cm³
Systemic radial velocity
-4.37 km/s
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
53.399 mas
Total Proper Motion
239.476 mas/yr
PM Right Ascension
-235.02 mas/yr
PM Declination
-45.99 mas/yr
Galactic Cartesian (pc)
x = -0.919 · y = 0.214 · z = -0.330
Equatorial (J2000)
RA 166.86435° · Dec -19.29169°
Galactic ℓ, b
271.650° · 37.185°
Ecliptic λ, β
175.927° · -22.857°
HTM-20 index
1706631384
Similar Worlds
Kepler-1684 b
Sub-Neptune · K-type orange
Radius 2.87 R⊕ · 2,028.7 ly
Kepler-391 c
Sub-Neptune · K-type orange
Radius 2.88 R⊕ · 2,835.1 ly
Kepler-1388 d
Sub-Neptune · K-type orange
Radius 2.86 R⊕ · 1,480.1 ly
K2-378 b
Sub-Neptune · K-type orange
Radius 2.88 R⊕ · 2,243.9 ly
Kepler-304 b
Sub-Neptune · K-type orange
Radius 2.86 R⊕ · 1,417.7 ly
TOI-5789 c
Sub-Neptune · K-type orange
Radius 2.86 R⊕ · 66.7 ly