Key parameters at a glance
- A radius of 2.06 Earth radii
- A mass of 4.88 Earth masses
- Surface gravity around 1.15 g
- An orbital period of 12.582 days
- Semi-major axis 0.1027 AU
- Equilibrium temperature 917 K (644 °C)
- Distance from Earth 789.13 light-years
- Earth Similarity Index 0.295
- Travel time at Voyager 1 speed 13,916,328 years
1 sibling around Kepler-449
Kepler-449 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-449 b this | Sub-Neptune | 2.06 | 4.88 | 12.582 | 917 | 2015 |
| Kepler-449 c | Sub-Neptune | 2.76 | 8.07 | 33.673 | 661 | 2015 |
Kepler-449 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1885of 1978
top 95.2%
This planet
2.06R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-449 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.06 | 11.21 |
| Mass (M⊕) | 1.00 | 4.88 | 317.83 |
| Density (g/cm³) | 5.51 | 3.09 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.15 | 2.53 |
| Insolation (S⊕) | 1.00 | 167.41 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 270779644
Gaia DR2
Gaia DR2 2077618037775709568
System
Kepler-449
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 12.58 Earth days (3.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1027 AU.
Transit Fingerprint
Depth
0.012 %
Duration
6.329 h
Impact parameter b
0.789
Rp / R★
0.009798
Transit midpoint (BJD)
2,455,008.0238
Photometric dip
Transit produces a flux drop of 119 ppm lasting ≈ 6.33 h.
Extended Orbital Architecture
Planet / star radius ratio
0.009798
Semi-major axis / stellar radius
9.480
Impact parameter (b)
0.789
Transit mid-time (BJD)
2,455,008.0238
Angular separation (arcsec)
0.42400
Eq. Temperature
917K
(644 °C)
Insolation (S⊕)
167.41
Earth = 1.00
Earth Similarity (ESI)
0.295
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
Van Eylen Albrecht 2015Instrument
Kepler CCD Array
Publication
2015-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2015 at Kepler (12 shown).
Host System: Kepler-449
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,649 K — cooler than the Sun (5,778 K)
Estimated Age
9.77 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.467 R☉
Stellar Mass
1.020 M☉
Metallicity [Fe/H]
-0.17
Extended Stellar Properties
Surface gravity (log g)
4.091 dex
Stellar density
0.390 g/cm³
Systemic radial velocity
14.63 km/s
Metallicity ratio
[M/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Total Proper Motion
45.397 mas/yr
PM Right Ascension
-5.52 mas/yr
PM Declination
-45.06 mas/yr
Galactic Cartesian (pc)
x = 0.300 · y = -0.681 · z = 0.668
Equatorial (J2000)
RA 293.73279° · Dec 41.90064°
Galactic ℓ, b
74.943° · 10.345°
Ecliptic λ, β
309.801° · 62.099°
HTM-20 index
-872962232
Similar Worlds
Kepler-183 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.06 R⊕ · 3,426.7 ly
Kepler-832 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.06 R⊕ · 5,505.9 ly
Kepler-1615 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.06 R⊕ · 4,546.1 ly
Kepler-958 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.06 R⊕ · 1,467.0 ly
HD 28471 d
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.06 R⊕ · 142.4 ly
Kepler-377 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.06 R⊕ · 2,686.9 ly