Key parameters at a glance
- A radius of 2.38 Earth radii
- A mass of 6.25 Earth masses
- Surface gravity around 1.10 g
- An orbital period of 2.800 days
- Semi-major axis 0.0343 AU
- Equilibrium temperature 956 K (683 °C)
- Distance from Earth 1,827.92 light-years
- Earth Similarity Index 0.268
- Travel time at Voyager 1 speed 32,235,455 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1788 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1373of 1978
top 69.4%
This planet
2.38R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1788 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.38 | 11.21 |
| Mass (M⊕) | 1.00 | 6.25 | 317.83 |
| Density (g/cm³) | 5.51 | 2.55 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.10 | 2.53 |
| Insolation (S⊕) | 1.00 | 197.81 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 159646433
Gaia DR2
Gaia DR2 2127435363438637952
Gaia DR3
Gaia DR3 2127435363438637952
System
Kepler-1788
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.80 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0343 AU.
Transit Fingerprint
Depth
0.071 %
Duration
0.965 h
Impact parameter b
0.024
Rp / R★
0.025566
Transit midpoint (BJD)
2,454,965.0468
Photometric dip
Transit produces a flux drop of 707 ppm lasting ≈ 0.97 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025566
Semi-major axis / stellar radius
22.730
Impact parameter (b)
0.024
Transit mid-time (BJD)
2,454,965.0468
Angular separation (arcsec)
0.06120
Eq. Temperature
956K
(683 °C)
Insolation (S⊕)
197.81
Earth = 1.00
Earth Similarity (ESI)
0.268
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
Valizadegan et al. 2022Instrument
Kepler CCD Array
Publication
2022-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Kepler (12 shown).
Host System: Kepler-1788
Spectral Class
K-type orange
Effective Temperature
4,786 K — cooler than the Sun (5,778 K)
Estimated Age
13.80 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.704 R☉
Stellar Mass
0.686 M☉
Metallicity [Fe/H]
-0.20
Extended Stellar Properties
Surface gravity (log g)
4.579 dex
Stellar density
5.758 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.756 mas
Total Proper Motion
5.345 mas/yr
PM Right Ascension
5.03 mas/yr
PM Declination
1.82 mas/yr
Galactic Cartesian (pc)
x = 0.252 · y = -0.650 · z = 0.717
Equatorial (J2000)
RA 291.22438° · Dec 45.77810°
Galactic ℓ, b
77.684° · 13.679°
Ecliptic λ, β
309.030° · 66.365°
HTM-20 index
1446993643
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