Key parameters at a glance
- A radius of 2.94 Earth radii
- A mass of 8.96 Earth masses
- Surface gravity around 1.04 g
- An orbital period of 2.453 days
- Semi-major axis 0.0320 AU
- Equilibrium temperature 737 K (464 °C)
- Distance from Earth 759.13 light-years
- Earth Similarity Index 0.323
- 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 b 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 this | Sub-Neptune | 2.94 | 8.96 | 2.453 | 737 | 2014 |
| Kepler-210 c | Sub-Neptune | 3.62 | 12.80 | 7.973 | 497 | 2014 |
Kepler-210 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#570of 1978
top 28.8%
This planet
2.94R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-210 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.94 | 11.21 |
| Mass (M⊕) | 1.00 | 8.96 | 317.83 |
| Density (g/cm³) | 5.51 | 1.94 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.04 | 2.53 |
| Insolation (S⊕) | 1.00 | 122.14 | 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 2.45 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0320 AU.
Transit Fingerprint
Depth
0.175 %
Duration
1.746 h
Impact parameter b
0.730
Rp / R★
0.038465
Transit midpoint (BJD)
2,455,003.8915
Photometric dip
Transit produces a flux drop of 1,752 ppm lasting ≈ 1.75 h.
Extended Orbital Architecture
Planet / star radius ratio
0.038465
Semi-major axis / stellar radius
4.429
Impact parameter (b)
0.730
Transit mid-time (BJD)
2,455,003.8915
Angular separation (arcsec)
0.13700
Eq. Temperature
737K
(464 °C)
Insolation (S⊕)
122.14
Earth = 1.00
Earth Similarity (ESI)
0.323
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
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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