Key parameters at a glance
- A radius of 1.99 Earth radii
- A mass of 4.62 Earth masses
- Surface gravity around 1.17 g
- An orbital period of 4.302 days
- Semi-major axis 0.0490 AU
- Equilibrium temperature 937 K (664 °C)
- Distance from Earth 1,987.21 light-years
- Earth Similarity Index 0.292
- Travel time at Voyager 1 speed 35,044,500 years
1 sibling around Kepler-181
Kepler-181 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-181 b | Super-Earth | 1.27 | 2.15 | 3.138 | 1,041 | 2014 |
| Kepler-181 c this | Super-Earth | 1.99 | 4.62 | 4.302 | 937 | 2014 |
Kepler-181 c Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#4of 1176
top 0.3%
This planet
1.99R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-181 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.99 | 11.21 |
| Mass (M⊕) | 1.00 | 4.62 | 317.83 |
| Density (g/cm³) | 5.51 | 3.22 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.17 | 2.53 |
| Insolation (S⊕) | 1.00 | 168.19 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 27767452
Gaia DR2
Gaia DR2 2135292507890372224
Gaia DR3
Gaia DR3 2135292507890372224
System
Kepler-181
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.30 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0490 AU.
Transit Fingerprint
Depth
0.075 %
Duration
1.965 h
Impact parameter b
0.050
Rp / R★
0.025041
Transit midpoint (BJD)
2,455,006.4372
Photometric dip
Transit produces a flux drop of 747 ppm lasting ≈ 1.97 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025041
Semi-major axis / stellar radius
16.820
Impact parameter (b)
0.050
Transit mid-time (BJD)
2,455,006.4372
Angular separation (arcsec)
0.08040
Eq. Temperature
937K
(664 °C)
Insolation (S⊕)
168.19
Earth = 1.00
Earth Similarity (ESI)
0.292
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-181
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,333 K — cooler than the Sun (5,778 K)
Estimated Age
6.46 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.749 R☉
Stellar Mass
0.810 M☉
Metallicity [Fe/H]
-0.04
Extended Stellar Properties
Surface gravity (log g)
4.619 dex
Stellar density
1.680 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.613 mas
Total Proper Motion
16.772 mas/yr
PM Right Ascension
-13.42 mas/yr
PM Declination
-10.07 mas/yr
Galactic Cartesian (pc)
x = 0.283 · y = -0.576 · z = 0.767
Equatorial (J2000)
RA 296.15128° · Dec 50.09578°
Galactic ℓ, b
83.156° · 12.623°
Ecliptic λ, β
321.711° · 68.887°
HTM-20 index
-441393064
Similar Worlds
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Super-Earth · G-type yellow (Sun-like)
Radius 1.99 R⊕ · 3,720.0 ly
Kepler-1457 b
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Kepler-142 b
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Kepler-625 b
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Kepler-526 b
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Radius 1.99 R⊕ · 2,172.7 ly
Kepler-60 d
Super-Earth · G-type yellow (Sun-like)
Radius 1.99 R⊕ · 3,343.4 ly