Key parameters at a glance
- A radius of 6.71 Earth radii
- A mass of 36.40 Earth masses
- Surface gravity around 0.81 g
- An orbital period of 1.729 days
- Semi-major axis 0.0224 AU
- Equilibrium temperature 1,074 K (800 °C)
- Distance from Earth 1,615.51 light-years
- Earth Similarity Index 0.151
- Travel time at Voyager 1 speed 28,489,449 years
- Almost certainly tidally locked to its host star given the close orbit
K2-45 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#224of 574
top 38.9%
This planet
6.71R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | K2-45 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 6.71 | 11.21 |
| Mass (M⊕) | 1.00 | 36.40 | 317.83 |
| Density (g/cm³) | 5.51 | 0.66 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.81 | 2.53 |
| Insolation (S⊕) | 1.00 | 100.00 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 38087018
Gaia DR2
Gaia DR2 3790858845506203264
Gaia DR3
Gaia DR3 3790858845506203264
System
K2-45
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.73 Earth days (0.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0224 AU.
Transit Fingerprint
Depth
2.406 %
Duration
1.689 h
Impact parameter b
0.350
Rp / R★
0.137600
Transit midpoint (BJD)
2,456,809.5260
Photometric dip
Transit produces a flux drop of 24,060 ppm lasting ≈ 1.69 h.
Extended Orbital Architecture
Planet / star radius ratio
0.137600
Semi-major axis / stellar radius
7.670
Impact parameter (b)
0.350
Transit mid-time (BJD)
2,456,809.5260
Long. of periastron (ω)
59.61°
Angular separation (arcsec)
0.04520
Eq. Temperature
1,074K
(800 °C)
Insolation (S⊕)
100.00
Earth = 1.00
Earth Similarity (ESI)
0.151
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
Crossfield et al. 2016Instrument
Kepler CCD Array
Publication
2016-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at K2 (12 shown).
Host System: K2-45
Spectral Class
K-type orange
Effective Temperature
4,103 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.445 R☉
Stellar Mass
0.503 M☉
Metallicity [Fe/H]
—
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
1.991 mas
Total Proper Motion
35.522 mas/yr
PM Right Ascension
-28.15 mas/yr
PM Declination
21.67 mas/yr
Galactic Cartesian (pc)
x = -0.983 · y = 0.180 · z = -0.031
Equatorial (J2000)
RA 169.63275° · Dec -1.77406°
Galactic ℓ, b
261.485° · 53.451°
Ecliptic λ, β
171.167° · -5.736°
HTM-20 index
1017522318
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