Key parameters at a glance
- A radius of 2.07 Earth radii
- A mass of 4.94 Earth masses
- Surface gravity around 1.15 g
- An orbital period of 17.761 days
- Semi-major axis 0.1085 AU
- Equilibrium temperature 368 K (95 °C)
- Distance from Earth 994.41 light-years
- Earth Similarity Index 0.687
- Travel time at Voyager 1 speed 17,536,486 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-988 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1860of 1978
top 94.0%
This planet
2.07R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-988 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.07 | 11.21 |
| Mass (M⊕) | 1.00 | 4.94 | 317.83 |
| Density (g/cm³) | 5.51 | 3.06 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.15 | 2.53 |
| Insolation (S⊕) | 1.00 | 6.56 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 159446957
Gaia DR2
Gaia DR2 2101938650863923712
Gaia DR3
Gaia DR3 2101938650863923712
System
Kepler-988
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 17.76 Earth days (4.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1085 AU.
Transit Fingerprint
Depth
0.129 %
Duration
1.686 h
Impact parameter b
0.627
Rp / R★
0.035537
Transit midpoint (BJD)
2,454,970.5063
Photometric dip
Transit produces a flux drop of 1,287 ppm lasting ≈ 1.69 h.
Extended Orbital Architecture
Planet / star radius ratio
0.035537
Semi-major axis / stellar radius
65.000
Impact parameter (b)
0.627
Transit mid-time (BJD)
2,454,970.5063
Angular separation (arcsec)
0.35600
Eq. Temperature
368K
(95 °C)
Insolation (S⊕)
6.56
Earth = 1.00
Earth Similarity (ESI)
0.687
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-988
Spectral Class
K-type orange
Effective Temperature
4,005 K — cooler than the Sun (5,778 K)
Estimated Age
3.16 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.530 R☉
Stellar Mass
0.550 M☉
Metallicity [Fe/H]
-0.32
Extended Stellar Properties
Surface gravity (log g)
4.730 dex
Stellar density
3.381 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.251 mas
Total Proper Motion
18.916 mas/yr
PM Right Ascension
-18.02 mas/yr
PM Declination
-5.74 mas/yr
Galactic Cartesian (pc)
x = 0.262 · y = -0.693 · z = 0.672
Equatorial (J2000)
RA 290.70826° · Dec 42.23722°
Galactic ℓ, b
74.233° · 12.505°
Ecliptic λ, β
305.425° · 63.152°
HTM-20 index
507516302
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