Key parameters at a glance
- A radius of 4.74 Earth radii
- A mass of 116.01 Earth masses
- Surface gravity around 5.16 g
- An orbital period of 4.030 days
- Semi-major axis 0.0477 AU
- Equilibrium temperature 1,089 K (816 °C)
- Distance from Earth 2,376.13 light-years
- Earth Similarity Index 0.125
- Travel time at Voyager 1 speed 41,903,015 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-553
Kepler-553 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-553 b this | Neptune-like | 4.74 | 116.01 | 4.030 | 1,089 | 2016 |
| Kepler-553 c | Gas Giant | 11.58 | 2,129.45 | 328.240 | 251 | 2016 |
Kepler-553 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#421of 574
top 73.2%
This planet
4.74R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | Kepler-553 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.74 | 11.21 |
| Mass (M⊕) | 1.00 | 116.01 | 317.83 |
| Density (g/cm³) | 5.51 | — | 1.33 |
| Surface Gravity (g) | 1.00 | 5.16 | 2.53 |
| Insolation (S⊕) | 1.00 | 235.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 116.007 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 264508613
Gaia DR2
Gaia DR2 2086498312157538688
Gaia DR3
Gaia DR3 2086498312157538688
System
Kepler-553
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.03 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0477 AU.
Transit Fingerprint
Depth
0.233 %
Duration
2.776 h
Impact parameter b
0.210
Rp / R★
0.048280
Transit midpoint (BJD)
2,455,004.0921
Photometric dip
Transit produces a flux drop of 2,331 ppm lasting ≈ 2.78 h.
Extended Orbital Architecture
Planet / star radius ratio
0.048280
Semi-major axis / stellar radius
11.400
Impact parameter (b)
0.210
RV semi-amplitude (K)
49.000 m/s
Transit mid-time (BJD)
2,455,004.0921
Angular separation (arcsec)
0.06540
Eq. Temperature
1,089K
(816 °C)
Insolation (S⊕)
235.00
Earth = 1.00
Earth Similarity (ESI)
0.125
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-553
Spectral Class
K-type orange
Effective Temperature
5,191 K — cooler than the Sun (5,778 K)
Estimated Age
8.80 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.902 R☉
Stellar Mass
0.889 M☉
Metallicity [Fe/H]
0.15
Extended Stellar Properties
Surface gravity (log g)
4.480 dex
Stellar density
1.727 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.344 mas
Total Proper Motion
29.042 mas/yr
PM Right Ascension
4.57 mas/yr
PM Declination
28.68 mas/yr
Galactic Cartesian (pc)
x = 0.318 · y = -0.584 · z = 0.747
Equatorial (J2000)
RA 298.55089° · Dec 48.33254°
Galactic ℓ, b
82.335° · 10.405°
Ecliptic λ, β
323.089° · 66.586°
HTM-20 index
1490443000
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