Key parameters at a glance
- A radius of 2.32 Earth radii
- A mass of 5.99 Earth masses
- Surface gravity around 1.11 g
- An orbital period of 13.094 days
- Semi-major axis 0.1100 AU
- Equilibrium temperature 752 K (479 °C)
- Distance from Earth 1,254.21 light-years
- Earth Similarity Index 0.347
- Travel time at Voyager 1 speed 22,117,936 years
1 sibling around Kepler-321
Kepler-321 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-321 b | Super-Earth | 1.77 | 3.78 | 4.915 | 1,042 | 2014 |
| Kepler-321 c this | Sub-Neptune | 2.32 | 5.99 | 13.094 | 752 | 2014 |
Kepler-321 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1469of 1978
top 74.2%
This planet
2.32R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-321 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.32 | 11.21 |
| Mass (M⊕) | 1.00 | 5.99 | 317.83 |
| Density (g/cm³) | 5.51 | 2.64 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.11 | 2.53 |
| Insolation (S⊕) | 1.00 | 80.10 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 271046140
Gaia DR2
Gaia DR2 2078327974388092544
Gaia DR3
Gaia DR3 2078327974388092544
System
Kepler-321
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 13.09 Earth days (3.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1100 AU.
Transit Fingerprint
Depth
0.040 %
Duration
2.140 h
Impact parameter b
0.010
Rp / R★
0.019238
Transit midpoint (BJD)
2,454,977.5237
Photometric dip
Transit produces a flux drop of 403 ppm lasting ≈ 2.14 h.
Extended Orbital Architecture
Planet / star radius ratio
0.019238
Semi-major axis / stellar radius
19.500
Impact parameter (b)
0.010
Transit mid-time (BJD)
2,454,977.5237
Angular separation (arcsec)
0.28600
Eq. Temperature
752K
(479 °C)
Insolation (S⊕)
80.10
Earth = 1.00
Earth Similarity (ESI)
0.347
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
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-321
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,740 K — cooler than the Sun (5,778 K)
Estimated Age
2.09 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.194 R☉
Stellar Mass
1.024 M☉
Metallicity [Fe/H]
0.12
Extended Stellar Properties
Surface gravity (log g)
4.302 dex
Stellar density
1.090 g/cm³
Systemic radial velocity
-10.77 km/s
Metallicity ratio
[M/H]
Multi-band Host Photometry — 15 bands
Astrometric Data
Parallax
2.572 mas
Total Proper Motion
3.522 mas/yr
PM Right Ascension
1.28 mas/yr
PM Declination
-3.28 mas/yr
Galactic Cartesian (pc)
x = 0.297 · y = -0.653 · z = 0.696
Equatorial (J2000)
RA 294.45370° · Dec 44.14576°
Galactic ℓ, b
77.218° · 10.908°
Ecliptic λ, β
312.665° · 64.006°
HTM-20 index
-1300374114
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Kepler-1951 b
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