Key parameters at a glance
- A radius of 3.22 Earth radii
- A mass of 10.40 Earth masses
- Surface gravity around 1.01 g
- An orbital period of 12.706 days
- Semi-major axis 0.1043 AU
- Equilibrium temperature 697 K (424 °C)
- Distance from Earth 2,052.97 light-years
- Earth Similarity Index 0.329
- Travel time at Voyager 1 speed 36,204,170 years
Kepler-1720 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#338of 1978
top 17.0%
This planet
3.22R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1720 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.22 | 11.21 |
| Mass (M⊕) | 1.00 | 10.40 | 317.83 |
| Density (g/cm³) | 5.51 | 1.72 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.01 | 2.53 |
| Insolation (S⊕) | 1.00 | 55.86 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 272839596
Gaia DR2
Gaia DR2 2080378808394131200
Gaia DR3
Gaia DR3 2080378808394131200
System
Kepler-1720
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 12.71 Earth days (3.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1043 AU.
Transit Fingerprint
Depth
0.087 %
Duration
2.395 h
Impact parameter b
0.965
Rp / R★
0.036500
Transit midpoint (BJD)
2,455,013.6316
Photometric dip
Transit produces a flux drop of 872 ppm lasting ≈ 2.40 h.
Extended Orbital Architecture
Planet / star radius ratio
0.036500
Semi-major axis / stellar radius
11.500
Impact parameter (b)
0.965
Transit mid-time (BJD)
2,455,013.6316
Angular separation (arcsec)
0.16600
Eq. Temperature
697K
(424 °C)
Insolation (S⊕)
55.86
Earth = 1.00
Earth Similarity (ESI)
0.329
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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
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-1720
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,573 K — cooler than the Sun (5,778 K)
Estimated Age
0.50 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.839 R☉
Stellar Mass
0.939 M☉
Metallicity [Fe/H]
-0.04
Extended Stellar Properties
Surface gravity (log g)
4.562 dex
Stellar density
2.216 g/cm³
Systemic radial velocity
28.04 km/s
Rotational v·sin i
1.30 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.560 mas
Total Proper Motion
13.458 mas/yr
PM Right Ascension
5.88 mas/yr
PM Declination
-12.10 mas/yr
Galactic Cartesian (pc)
x = 0.307 · y = -0.607 · z = 0.733
Equatorial (J2000)
RA 296.80868° · Dec 47.17186°
Galactic ℓ, b
80.725° · 10.869°
Ecliptic λ, β
319.165° · 66.096°
HTM-20 index
1239802344
Similar Worlds
Kepler-648 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.22 R⊕ · 2,074.5 ly
HD 31527 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.22 R⊕ · 125.4 ly
TOI-3493 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.22 R⊕ · 315.5 ly
HD 196067 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.21 R⊕ · 130.2 ly
Kepler-782 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.21 R⊕ · 1,457.4 ly
K2-341 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.21 R⊕ · 1,374.4 ly