Key parameters at a glance
- A radius of 2.91 Earth radii
- A mass of 8.80 Earth masses
- Surface gravity around 1.04 g
- An orbital period of 116.583 days
- Semi-major axis 0.4572 AU
- Equilibrium temperature 371 K (98 °C)
- Distance from Earth 2,737.53 light-years
- Earth Similarity Index 0.600
- Travel time at Voyager 1 speed 48,276,368 years
1 sibling around Kepler-1801
Kepler-1801 c 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-1801 b | Sub-Neptune | 2.71 | 7.80 | 10.441 | 829 | 2021 |
| Kepler-1801 c this | Sub-Neptune | 2.91 | 8.80 | 116.583 | 371 | 2023 |
Kepler-1801 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#608of 1978
top 30.7%
This planet
2.91R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1801 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.91 | 11.21 |
| Mass (M⊕) | 1.00 | 8.80 | 317.83 |
| Density (g/cm³) | 5.51 | 1.96 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.04 | 2.53 |
| Insolation (S⊕) | 1.00 | 4.47 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 139034625
Gaia DR2
Gaia DR2 2076185408488670208
Gaia DR3
Gaia DR3 2076185408488670208
System
Kepler-1801
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 116.58 Earth days (31.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.4572 AU.
Transit Fingerprint
Depth
0.082 %
Duration
5.800 h
Impact parameter b
0.586
Rp / R★
0.027148
Transit midpoint (BJD)
2,455,079.6275
Photometric dip
Transit produces a flux drop of 819 ppm lasting ≈ 5.80 h.
Extended Orbital Architecture
Planet / star radius ratio
0.027148
Semi-major axis / stellar radius
129.500
Impact parameter (b)
0.586
Transit mid-time (BJD)
2,455,079.6275
Angular separation (arcsec)
0.54500
Eq. Temperature
371K
(98 °C)
Insolation (S⊕)
4.47
Earth = 1.00
Earth Similarity (ESI)
0.600
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
Valizadegan et al. 2023Instrument
Kepler CCD Array
Publication
2023-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Kepler (12 shown).
Host System: Kepler-1801
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,738 K — cooler than the Sun (5,778 K)
Estimated Age
8.10 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.981 R☉
Stellar Mass
0.936 M☉
Metallicity [Fe/H]
-0.06
Extended Stellar Properties
Surface gravity (log g)
4.426 dex
Stellar density
3.023 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.163 mas
Total Proper Motion
4.354 mas/yr
PM Right Ascension
4.01 mas/yr
PM Declination
-1.70 mas/yr
Galactic Cartesian (pc)
x = 0.330 · y = -0.701 · z = 0.632
Equatorial (J2000)
RA 295.16401° · Dec 39.20140°
Galactic ℓ, b
73.043° · 8.119°
Ecliptic λ, β
310.039° · 59.192°
HTM-20 index
-1968841251
Similar Worlds
Kepler-949 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.91 R⊕ · 1,585.5 ly
TOI-1221 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.91 R⊕ · 451.4 ly
TOI-1117 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.91 R⊕ · 546.6 ly
Kepler-325 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.91 R⊕ · 2,685.1 ly
HD 45184 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.91 R⊕ · 71.6 ly
K2-365 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.91 R⊕ · 610.6 ly