Key parameters at a glance
- A radius of 2.61 Earth radii
- A mass of 7.33 Earth masses
- Surface gravity around 1.07 g
- An orbital period of 9.783 days
- Semi-major axis 0.0761 AU
- Equilibrium temperature 560 K (287 °C)
- Distance from Earth 570.63 light-years
- Earth Similarity Index 0.441
- Travel time at Voyager 1 speed 10,062,993 years
- Almost certainly tidally locked to its host star given the close orbit
K2-54 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#996of 1978
top 50.3%
This planet
2.61R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-54 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.61 | 11.21 |
| Mass (M⊕) | 1.00 | 7.33 | 317.83 |
| Density (g/cm³) | 5.51 | 2.26 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.07 | 2.53 |
| Insolation (S⊕) | 1.00 | 6.10 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 12822545
Gaia DR2
Gaia DR2 2594546351459477760
Gaia DR3
Gaia DR3 2594546351459477760
System
K2-54
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.78 Earth days (2.7% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0761 AU.
Transit Fingerprint
Depth
0.139 %
Duration
2.789 h
Impact parameter b
0.370
Rp / R★
0.037300
Transit midpoint (BJD)
2,457,012.2875
Photometric dip
Transit produces a flux drop of 1,390 ppm lasting ≈ 2.79 h.
Extended Orbital Architecture
Planet / star radius ratio
0.037300
Semi-major axis / stellar radius
25.400
Impact parameter (b)
0.370
Transit mid-time (BJD)
2,457,012.2875
Long. of periastron (ω)
-43.00°
Angular separation (arcsec)
0.43500
Eq. Temperature
560K
(287 °C)
Insolation (S⊕)
6.10
Earth = 1.00
Earth Similarity (ESI)
0.441
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.
Discovery Paper
Primary reference
Crossfield et al. 2016Instrument
Kepler CCD Array
Publication
2016-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at K2 (12 shown).
Host System: K2-54
Spectral Class
K-type orange
Effective Temperature
3,990 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.643 R☉
Stellar Mass
0.615 M☉
Metallicity [Fe/H]
-0.02
Extended Stellar Properties
Surface gravity (log g)
4.610 dex
Stellar density
3.250 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 8 bands
Astrometric Data
Parallax
5.687 mas
Total Proper Motion
10.920 mas/yr
PM Right Ascension
-5.00 mas/yr
PM Declination
-9.71 mas/yr
Galactic Cartesian (pc)
x = 0.884 · y = -0.356 · z = -0.301
Equatorial (J2000)
RA 338.05416° · Dec -17.54406°
Galactic ℓ, b
42.190° · -56.535°
Ecliptic λ, β
333.191° · -7.748°
HTM-20 index
-1567387726
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