Key parameters at a glance
- A radius of 3.62 Earth radii
- A mass of 12.80 Earth masses
- Surface gravity around 0.98 g
- An orbital period of 7.973 days
- Semi-major axis 0.0700 AU
- Equilibrium temperature 497 K (224 °C)
- Distance from Earth 759.13 light-years
- Earth Similarity Index 0.430
- Travel time at Voyager 1 speed 13,387,223 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-210
Kepler-210 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-210 b | Sub-Neptune | 2.94 | 8.96 | 2.453 | 737 | 2014 |
| Kepler-210 c this | Sub-Neptune | 3.62 | 12.80 | 7.973 | 497 | 2014 |
Kepler-210 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#128of 1978
top 6.4%
This planet
3.62R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-210 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.62 | 11.21 |
| Mass (M⊕) | 1.00 | 12.80 | 317.83 |
| Density (g/cm³) | 5.51 | 1.48 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.98 | 2.53 |
| Insolation (S⊕) | 1.00 | 25.44 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 63283780
Gaia DR2
Gaia DR2 2125864573640675968
Gaia DR3
Gaia DR3 2125864573640675968
System
Kepler-210
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.97 Earth days (2.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0700 AU.
Transit Fingerprint
Depth
0.325 %
Duration
2.902 h
Impact parameter b
0.400
Rp / R★
0.063500
Transit midpoint (BJD)
2,455,004.5844
Photometric dip
Transit produces a flux drop of 3,245 ppm lasting ≈ 2.90 h.
Extended Orbital Architecture
Planet / star radius ratio
0.063500
Semi-major axis / stellar radius
11.566
Impact parameter (b)
0.400
Transit mid-time (BJD)
2,455,004.5844
Angular separation (arcsec)
0.30100
Eq. Temperature
497K
(224 °C)
Insolation (S⊕)
25.44
Earth = 1.00
Earth Similarity (ESI)
0.430
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.
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
Rowe et al. 2014Instrument
Kepler CCD Array
Publication
2014-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-210
Spectral Class
M-type red dwarf
Effective Temperature
4,559 K — cooler than the Sun (5,778 K)
Estimated Age
1.78 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.650 R☉
Stellar Mass
0.770 M☉
Metallicity [Fe/H]
0.28
Extended Stellar Properties
Surface gravity (log g)
4.663 dex
Stellar density
1.194 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
4.268 mas
Total Proper Motion
16.316 mas/yr
PM Right Ascension
7.46 mas/yr
PM Declination
14.51 mas/yr
Galactic Cartesian (pc)
x = 0.280 · y = -0.675 · z = 0.683
Equatorial (J2000)
RA 292.50342° · Dec 43.08322°
Galactic ℓ, b
75.601° · 11.687°
Ecliptic λ, β
308.821° · 63.521°
HTM-20 index
-219182264
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