Key parameters at a glance
- A radius of 2.85 Earth radii
- A mass of 8.50 Earth masses
- Surface gravity around 1.05 g
- An orbital period of 19.306 days
- Semi-major axis 0.1400 AU
- Equilibrium temperature 815 K (542 °C)
- Distance from Earth 3,894.79 light-years
- Earth Similarity Index 0.295
- Travel time at Voyager 1 speed 68,684,651 years
2 siblings around Kepler-288
Kepler-288 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-288 b | Super-Earth | 1.67 | 3.43 | 6.097 | 1,197 | 2014 |
| Kepler-288 c this | Sub-Neptune | 2.85 | 8.50 | 19.306 | 815 | 2014 |
| Kepler-288 d | Sub-Neptune | 2.67 | 7.61 | 56.634 | 570 | 2014 |
Kepler-288 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#685of 1978
top 34.6%
This planet
2.85R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-288 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.85 | 11.21 |
| Mass (M⊕) | 1.00 | 8.50 | 317.83 |
| Density (g/cm³) | 5.51 | 2.02 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.05 | 2.53 |
| Insolation (S⊕) | 1.00 | 53.15 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 121785939
Gaia DR2
Gaia DR2 2101215309651322880
Gaia DR3
Gaia DR3 2101215309651322880
System
Kepler-288
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 19.31 Earth days (5.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1400 AU.
Transit Fingerprint
Depth
0.071 %
Duration
4.192 h
Impact parameter b
0.060
Rp / R★
0.024067
Transit midpoint (BJD)
2,455,206.1906
Photometric dip
Transit produces a flux drop of 709 ppm lasting ≈ 4.19 h.
Extended Orbital Architecture
Planet / star radius ratio
0.024067
Semi-major axis / stellar radius
35.210
Impact parameter (b)
0.060
Transit mid-time (BJD)
2,455,206.1906
Angular separation (arcsec)
0.11700
Eq. Temperature
815K
(542 °C)
Insolation (S⊕)
53.15
Earth = 1.00
Earth Similarity (ESI)
0.295
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Discovery Paper
Primary reference
Rowe et al. 2014Instrument
Kepler CCD Array
Publication
2014-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-288
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,918 K — hotter than the Sun (5,778 K)
Estimated Age
12.30 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.091 R☉
Stellar Mass
0.842 M☉
Metallicity [Fe/H]
-0.24
Extended Stellar Properties
Surface gravity (log g)
4.353 dex
Stellar density
0.800 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
0.809 mas
Total Proper Motion
1.418 mas/yr
PM Right Ascension
-0.50 mas/yr
PM Declination
1.33 mas/yr
Galactic Cartesian (pc)
x = 0.250 · y = -0.729 · z = 0.637
Equatorial (J2000)
RA 288.91640° · Dec 39.59475°
Galactic ℓ, b
71.193° · 12.607°
Ecliptic λ, β
301.025° · 61.012°
HTM-20 index
-85477780
Similar Worlds
HD 39855 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.85 R⊕ · 75.9 ly
Kepler-800 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.85 R⊕ · 3,324.4 ly
Kepler-466 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.85 R⊕ · 1,729.0 ly
HD 189567 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.85 R⊕ · 58.4 ly
Kepler-358 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.85 R⊕ · 3,591.3 ly
HD 135694 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.86 R⊕ · 240.9 ly