Key parameters at a glance
- A radius of 2.15 Earth radii
- A mass of 5.27 Earth masses
- Surface gravity around 1.14 g
- An orbital period of 6.985 days
- Semi-major axis 0.0559 AU
- Distance from Earth 499.64 light-years
- Earth Similarity Index 0.759
- Travel time at Voyager 1 speed 8,811,237 years
- Almost certainly tidally locked to its host star given the close orbit
K2-71 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1741of 1978
top 88.0%
This planet
2.15R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-71 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.15 | 11.21 |
| Mass (M⊕) | 1.00 | 5.27 | 317.83 |
| Density (g/cm³) | 5.51 | 2.91 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.14 | 2.53 |
| Insolation (S⊕) | 1.00 | 13.40 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 402287746
Gaia DR2
Gaia DR2 2608279114251674624
Gaia DR3
Gaia DR3 2608279114251674624
System
K2-71
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.99 Earth days (1.9% of a terrestrial year) at a mean orbital distance of 0.0559 AU.
Transit Fingerprint
Depth
0.291 %
Duration
1.410 h
Impact parameter b
0.880
Rp / R★
0.045700
Transit midpoint (BJD)
2,456,987.3785
Photometric dip
Transit produces a flux drop of 2,910 ppm lasting ≈ 1.41 h.
Extended Orbital Architecture
Planet / star radius ratio
0.045700
Impact parameter (b)
0.880
Transit mid-time (BJD)
2,456,987.3785
Angular separation (arcsec)
0.36500
Eq. Temperature
—
Insolation (S⊕)
13.40
Earth = 1.00
Earth Similarity (ESI)
0.759
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water). 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: K2-71
Spectral Class
K-type orange
Effective Temperature
4,006 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.426 R☉
Stellar Mass
0.477 M☉
Metallicity [Fe/H]
—
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
6.499 mas
Total Proper Motion
103.557 mas/yr
PM Right Ascension
103.56 mas/yr
PM Declination
0.59 mas/yr
Galactic Cartesian (pc)
x = 0.935 · y = -0.309 · z = -0.172
Equatorial (J2000)
RA 341.72487° · Dec -9.88161°
Galactic ℓ, b
57.398° · -55.970°
Ecliptic λ, β
339.392° · -1.981°
HTM-20 index
968583265
Similar Worlds
K2-42 b
Sub-Neptune · K-type orange
Radius 2.15 R⊕ · 1,294.6 ly
Kepler-61 b
Sub-Neptune · K-type orange
Radius 2.15 R⊕ · 1,092.9 ly
Kepler-566 b
Sub-Neptune · K-type orange
Radius 2.15 R⊕ · 1,840.4 ly
Kepler-1013 b
Sub-Neptune · K-type orange
Radius 2.15 R⊕ · 1,377.2 ly
Kepler-1455 b
Sub-Neptune · K-type orange
Radius 2.16 R⊕ · 1,166.4 ly
Kepler-437 b
Sub-Neptune · K-type orange
Radius 2.14 R⊕ · 991.5 ly