Key parameters at a glance
- A radius of 2.08 Earth radii
- A mass of 4.98 Earth masses
- Surface gravity around 1.15 g
- An orbital period of 201.121 days
- Semi-major axis 0.6725 AU
- Equilibrium temperature 300 K (27 °C)
- Distance from Earth 1,572.46 light-years
- Earth Similarity Index 0.799
- Travel time at Voyager 1 speed 27,730,331 years
Kepler-1040 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1846of 1978
top 93.3%
This planet
2.08R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1040 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.08 | 11.21 |
| Mass (M⊕) | 1.00 | 4.98 | 317.83 |
| Density (g/cm³) | 5.51 | 3.04 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.15 | 2.53 |
| Insolation (S⊕) | 1.00 | 2.12 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 48217265
Gaia DR2
Gaia DR2 2131701365472538112
Gaia DR3
Gaia DR3 2131701365472538112
System
Kepler-1040
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 201.12 Earth days (55.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.6725 AU.
Transit Fingerprint
Depth
0.047 %
Duration
10.575 h
Impact parameter b
0.770
Rp / R★
0.019888
Transit midpoint (BJD)
2,455,020.5611
Photometric dip
Transit produces a flux drop of 473 ppm lasting ≈ 10.58 h.
Extended Orbital Architecture
Planet / star radius ratio
0.019888
Semi-major axis / stellar radius
152.010
Impact parameter (b)
0.770
Transit mid-time (BJD)
2,455,020.5611
Angular separation (arcsec)
1.39000
Eq. Temperature
300K
(27 °C)
Insolation (S⊕)
2.12
Earth = 1.00
Earth Similarity (ESI)
0.799
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Transit timing variations
Gravitational interactions from neighbours have been detected.
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-1040
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,694 K — cooler than the Sun (5,778 K)
Estimated Age
4.17 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.960 R☉
Stellar Mass
0.980 M☉
Metallicity [Fe/H]
0.01
Extended Stellar Properties
Surface gravity (log g)
4.470 dex
Stellar density
1.100 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.045 mas
Total Proper Motion
21.794 mas/yr
PM Right Ascension
-2.94 mas/yr
PM Declination
-21.59 mas/yr
Galactic Cartesian (pc)
x = 0.151 · y = -0.650 · z = 0.745
Equatorial (J2000)
RA 283.11377° · Dec 48.13128°
Galactic ℓ, b
77.789° · 19.690°
Ecliptic λ, β
296.766° · 70.354°
HTM-20 index
1440266138
Similar Worlds
Kepler-1188 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.08 R⊕ · 5,601.7 ly
Kepler-528 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.08 R⊕ · 2,557.8 ly
Kepler-405 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.08 R⊕ · 3,473.8 ly
Kepler-1866 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.08 R⊕ · 3,185.7 ly
K2-382 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.07 R⊕ · 908.1 ly
TOI-2128 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.09 R⊕ · 119.3 ly