Key parameters at a glance
- A radius of 2.31 Earth radii
- A mass of 5.94 Earth masses
- Surface gravity around 1.11 g
- An orbital period of 16.856 days
- Semi-major axis 0.1082 AU
- Equilibrium temperature 408 K (135 °C)
- Distance from Earth 1,288.96 light-years
- Earth Similarity Index 0.608
- Travel time at Voyager 1 speed 22,730,728 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1798 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1494of 1978
top 75.5%
This planet
2.31R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1798 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.31 | 11.21 |
| Mass (M⊕) | 1.00 | 5.94 | 317.83 |
| Density (g/cm³) | 5.51 | 2.65 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.11 | 2.53 |
| Insolation (S⊕) | 1.00 | 6.52 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 137315414
Gaia DR2
Gaia DR2 2051797274209237376
Gaia DR3
Gaia DR3 2051797274209237376
System
Kepler-1798
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 16.86 Earth days (4.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1082 AU.
Transit Fingerprint
Depth
0.087 %
Duration
2.309 h
Impact parameter b
0.038
Rp / R★
0.026549
Transit midpoint (BJD)
2,454,971.2681
Photometric dip
Transit produces a flux drop of 872 ppm lasting ≈ 2.31 h.
Extended Orbital Architecture
Planet / star radius ratio
0.026549
Semi-major axis / stellar radius
57.210
Impact parameter (b)
0.038
Transit mid-time (BJD)
2,454,971.2681
Angular separation (arcsec)
0.27400
Eq. Temperature
408K
(135 °C)
Insolation (S⊕)
6.52
Earth = 1.00
Earth Similarity (ESI)
0.608
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-1798
Spectral Class
K-type orange
Effective Temperature
3,967 K — cooler than the Sun (5,778 K)
Estimated Age
4.36 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.587 R☉
Stellar Mass
0.593 M☉
Metallicity [Fe/H]
0.06
Extended Stellar Properties
Surface gravity (log g)
4.674 dex
Stellar density
12.469 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.502 mas
Total Proper Motion
12.748 mas/yr
PM Right Ascension
4.99 mas/yr
PM Declination
11.73 mas/yr
Galactic Cartesian (pc)
x = 0.294 · y = -0.737 · z = 0.609
Equatorial (J2000)
RA 291.72623° · Dec 37.52897°
Galactic ℓ, b
70.277° · 9.728°
Ecliptic λ, β
304.095° · 58.424°
HTM-20 index
1961474152
Similar Worlds
K2-57 b
Sub-Neptune · K-type orange
Radius 2.31 R⊕ · 861.7 ly
Kepler-417 b
Sub-Neptune · K-type orange
Radius 2.31 R⊕ · 3,176.7 ly
TOI-178 e
Sub-Neptune · K-type orange
Radius 2.30 R⊕ · 204.5 ly
K2-59 c
Sub-Neptune · K-type orange
Radius 2.30 R⊕ · 1,015.4 ly
Kepler-224 d
Sub-Neptune · K-type orange
Radius 2.30 R⊕ · 2,550.8 ly
Kepler-621 b
Sub-Neptune · K-type orange
Radius 2.30 R⊕ · 1,268.7 ly