Key parameters at a glance
- A radius of 10.76 Earth radii
- A mass of 160.50 Earth masses
- Surface gravity around 1.39 g
- An orbital period of 2.455 days
- Semi-major axis 0.0300 AU
- Equilibrium temperature 1,000 K (727 °C)
- Distance from Earth 1,245.75 light-years
- Earth Similarity Index 0.150
- Travel time at Voyager 1 speed 21,968,793 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-45 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1699of 1771
top 95.9%
This planet
10.76R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | Kepler-45 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.76 | 11.21 |
| Mass (M⊕) | 1.00 | 160.50 | 317.83 |
| Density (g/cm³) | 5.51 | 0.80 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.39 | 2.53 |
| Insolation (S⊕) | 1.00 | 68.37 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 160.497 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 137899948
Gaia DR2
Gaia DR2 2053562475706063744
Gaia DR3
Gaia DR3 2053562475706063744
System
Kepler-45
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.46 Earth days (0.7% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0300 AU.
Transit Fingerprint
Depth
3.204 %
Duration
1.727 h
Impact parameter b
0.600
Rp / R★
0.179000
Transit midpoint (BJD)
2,455,003.8218
Photometric dip
Transit produces a flux drop of 32,040 ppm lasting ≈ 1.73 h.
Extended Orbital Architecture
Planet / star radius ratio
0.179000
Semi-major axis / stellar radius
10.600
Impact parameter (b)
0.600
RV semi-amplitude (K)
110.000 m/s
Transit mid-time (BJD)
2,455,003.8218
Long. of periastron (ω)
230.00°
Angular separation (arcsec)
0.07850
Eq. Temperature
1,000K
(727 °C)
Insolation (S⊕)
68.37
Earth = 1.00
Earth Similarity (ESI)
0.150
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.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Johnson et al. 2012Instrument
Kepler CCD Array
Publication
2012-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2011 at Kepler (12 shown).
Host System: Kepler-45
Spectral Class
M-type red dwarf
Effective Temperature
3,820 K — cooler than the Sun (5,778 K)
Estimated Age
0.50 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.550 R☉
Stellar Mass
0.590 M☉
Metallicity [Fe/H]
0.28
Extended Stellar Properties
Surface gravity (log g)
4.700 dex
Stellar density
4.000 g/cm³
Rotation period
15.80 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.590 mas
Total Proper Motion
22.071 mas/yr
PM Right Ascension
4.64 mas/yr
PM Declination
-21.58 mas/yr
Galactic Cartesian (pc)
x = 0.293 · y = -0.695 · z = 0.657
Equatorial (J2000)
RA 292.87293° · Dec 41.06417°
Galactic ℓ, b
73.887° · 10.536°
Ecliptic λ, β
307.925° · 61.525°
HTM-20 index
1801272451
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