Key parameters at a glance
- A radius of 3.53 Earth radii
- A mass of 12.20 Earth masses
- Surface gravity around 0.98 g
- An orbital period of 148.460 days
- Semi-major axis 0.5238 AU
- Equilibrium temperature 285 K (12 °C)
- Distance from Earth 1,905.19 light-years
- Earth Similarity Index 0.663
- Travel time at Voyager 1 speed 33,598,105 years
1 sibling around Kepler-1038
Kepler-1038 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 |
|---|---|---|---|---|---|---|
| Kepler-1038 c | Super-Earth | 1.42 | 2.59 | 7.128 | 784 | 2021 |
| Kepler-1038 b this | Sub-Neptune | 3.53 | 12.20 | 148.460 | 285 | 2016 |
Kepler-1038 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#164of 1978
top 8.2%
This planet
3.53R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1038 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.53 | 11.21 |
| Mass (M⊕) | 1.00 | 12.20 | 317.83 |
| Density (g/cm³) | 5.51 | 1.52 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.98 | 2.53 |
| Insolation (S⊕) | 1.00 | 1.51 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 268483792
Gaia DR2
Gaia DR2 2079028676836456960
Gaia DR3
Gaia DR3 2079028676836456960
System
Kepler-1038
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 148.46 Earth days (40.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.5238 AU.
Transit Fingerprint
Depth
0.161 %
Duration
5.402 h
Impact parameter b
0.810
Rp / R★
0.039480
Transit midpoint (BJD)
2,454,984.3857
Photometric dip
Transit produces a flux drop of 1,607 ppm lasting ≈ 5.40 h.
Extended Orbital Architecture
Planet / star radius ratio
0.039480
Semi-major axis / stellar radius
131.000
Impact parameter (b)
0.810
Transit mid-time (BJD)
2,454,984.3857
Angular separation (arcsec)
0.89700
Eq. Temperature
285K
(12 °C)
Insolation (S⊕)
1.51
Earth = 1.00
Earth Similarity (ESI)
0.663
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.
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-1038
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,335 K — cooler than the Sun (5,778 K)
Estimated Age
4.27 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.830 R☉
Stellar Mass
0.870 M☉
Metallicity [Fe/H]
-0.04
Extended Stellar Properties
Surface gravity (log g)
4.550 dex
Stellar density
3.961 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.684 mas
Total Proper Motion
11.679 mas/yr
PM Right Ascension
-9.46 mas/yr
PM Declination
-6.84 mas/yr
Galactic Cartesian (pc)
x = 0.348 · y = -0.628 · z = 0.696
Equatorial (J2000)
RA 298.97215° · Dec 44.13235°
Galactic ℓ, b
78.791° · 8.061°
Ecliptic λ, β
319.288° · 62.701°
HTM-20 index
1955328165
Similar Worlds
Kepler-1835 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.53 R⊕ · 4,580.5 ly
HD 45184 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.52 R⊕ · 71.6 ly
Kepler-802 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.54 R⊕ · 2,545.9 ly
Kepler-657 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.52 R⊕ · 5,518.2 ly
Kepler-1316 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.54 R⊕ · 2,612.1 ly
TOI-5398 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.52 R⊕ · 426.8 ly