Key parameters at a glance
- A radius of 2.44 Earth radii
- A mass of 6.53 Earth masses
- Surface gravity around 1.10 g
- An orbital period of 61.570 days
- Semi-major axis 0.3045 AU
- Equilibrium temperature 530 K (257 °C)
- Distance from Earth 6,737.05 light-years
- Earth Similarity Index 0.476
- Travel time at Voyager 1 speed 118,807,795 years
1 sibling around Kepler-1491
Kepler-1491 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-1491 b | Super-Earth | 1.51 | 2.89 | 16.586 | 821 | 2016 |
| Kepler-1491 c this | Sub-Neptune | 2.44 | 6.53 | 61.570 | 530 | 2023 |
Kepler-1491 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1269of 1978
top 64.1%
This planet
2.44R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1491 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.44 | 11.21 |
| Mass (M⊕) | 1.00 | 6.53 | 317.83 |
| Density (g/cm³) | 5.51 | 2.47 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.10 | 2.53 |
| Insolation (S⊕) | 1.00 | 18.66 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 270617233
Gaia DR2
Gaia DR2 2127985806448631808
Gaia DR3
Gaia DR3 2127985806448631808
System
Kepler-1491
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 61.57 Earth days (16.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3045 AU.
Transit Fingerprint
Depth
0.030 %
Duration
9.750 h
Impact parameter b
0.486
Rp / R★
0.016067
Transit midpoint (BJD)
2,455,015.0201
Photometric dip
Transit produces a flux drop of 298 ppm lasting ≈ 9.75 h.
Extended Orbital Architecture
Planet / star radius ratio
0.016067
Semi-major axis / stellar radius
43.000
Impact parameter (b)
0.486
Transit mid-time (BJD)
2,455,015.0201
Angular separation (arcsec)
0.14700
Eq. Temperature
530K
(257 °C)
Insolation (S⊕)
18.66
Earth = 1.00
Earth Similarity (ESI)
0.476
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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-1491
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,626 K — cooler than the Sun (5,778 K)
Estimated Age
4.57 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.389 R☉
Stellar Mass
0.991 M☉
Metallicity [Fe/H]
0.14
Extended Stellar Properties
Surface gravity (log g)
4.149 dex
Stellar density
0.398 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.455 mas
Total Proper Motion
2.997 mas/yr
PM Right Ascension
1.04 mas/yr
PM Declination
-2.81 mas/yr
Galactic Cartesian (pc)
x = 0.280 · y = -0.639 · z = 0.716
Equatorial (J2000)
RA 293.62976° · Dec 45.74063°
Galactic ℓ, b
78.398° · 12.152°
Ecliptic λ, β
312.829° · 65.703°
HTM-20 index
-1369680192
Similar Worlds
Kepler-338 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.44 R⊕ · 1,803.0 ly
K2-198 d
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.44 R⊕ · 360.6 ly
K2-44 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.43 R⊕ · 1,554.8 ly
Kepler-1739 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.43 R⊕ · 2,556.0 ly
Kepler-307 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.43 R⊕ · 1,877.3 ly
Kepler-233 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.43 R⊕ · 2,793.3 ly