Key parameters at a glance

A radius of 0.66 Earth radii
A mass of 0.22 Earth masses
Surface gravity around 0.50 g
An orbital period of 5.250 days
Semi-major axis 0.0555 AU
Equilibrium temperature 954 K (681 °C)
Distance from Earth 1,319.44 light-years
Earth Similarity Index 0.302
Travel time at Voyager 1 speed 23,268,288 years

2 siblings around Kepler-271

Kepler-271 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-271 d this	Rocky Terrestrial	0.66	0.22	5.250	954	2016
Kepler-271 c	Rocky Terrestrial	0.95	0.81	7.411	850	2014
Kepler-271 b	Rocky Terrestrial	1.23	2.04	10.435	759	2014

Kepler-271 d Planet Profile

Physical Specs

Radius

0.66 R⊕

Radius (Jupiter)

0.059 R♃

Mass

0.22 M⊕

Mass (Jupiter)

0.001 M♃

Density

4.19 g/cm³

Surface Gravity

0.50 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.302

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#538of 570

top 94.2%

This planet

0.66R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-431 c 0.67 R⊕ Kepler-1351 b 0.65 R⊕ Kepler-1542 c 0.65 R⊕

Metric	Earth	Kepler-271 d	Jupiter
Radius (R⊕)	1.00	0.66	11.21
Mass (M⊕)	1.00	0.22	317.83
Density (g/cm³)	5.51	4.19	1.33
Surface Gravity (g)	1.00	0.50	2.53
Insolation (S⊕)	1.00	189.34	0.037

Star Catalogue Identifiers

TIC

TIC 164414655

Gaia DR2

Gaia DR2 2105343799713595904

Gaia DR3

Gaia DR3 2105343799713595904

System

Kepler-271

Percentile among Rocky Terrestrial cohort

Radius 0.660 R⊕ · percentile 6 / cohort 570

Mass 0.219 M⊕ · percentile 4 / cohort 570

Orbital period 5.25 d · percentile 56 / cohort 567

Distance 404.54 pc · percentile 54 / cohort 566

ESI 0.302 · percentile 39 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

5.250 days

Semi-major axis

0.0555 AU

Eccentricity

0.000

Inclination

89.01 °

Year Length

A year here lasts approximately 5.25 Earth days (1.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0555 AU.

Transit Fingerprint

Depth

0.006 %

Duration

2.766 h

Impact parameter b

0.480

Rp / R★

0.007222

Transit midpoint (BJD)

2,454,968.4651

Photometric dip

Transit produces a flux drop of 62 ppm lasting ≈ 2.77 h.

Extended Orbital Architecture

Planet / star radius ratio

0.007222

Semi-major axis / stellar radius

14.410

Impact parameter (b)

0.480

Transit mid-time (BJD)

2,454,968.4651

Angular separation (arcsec)

0.13700

Eq. Temperature

954K

(681 °C)

Insolation (S⊕)

189.34

Earth = 1.00

Earth Similarity (ESI)

0.302

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

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-271

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,555 K — cooler than the Sun (5,778 K)

Estimated Age

4.57 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.870 R☉

Stellar Mass

0.900 M☉

Metallicity [Fe/H]

-0.13

Extended Stellar Properties

Surface gravity (log g)

4.520 dex

Stellar density

1.360 g/cm³

Metallicity ratio

[Fe/H]

Distance

404.54 parsec

Light-years 1,319.44 ly

V-band magnitude

13.58 mag

Voyager-speed travel 23,268,288 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.443 mas

Total Proper Motion

27.419 mas/yr

PM Right Ascension

-9.29 mas/yr

PM Declination

-25.80 mas/yr

Galactic Cartesian (pc)

x = 0.161 · y = -0.698 · z = 0.698

Equatorial (J2000)

RA 283.00293° · Dec 44.28411°

Galactic ℓ, b

73.928° · 18.468°

Ecliptic λ, β

293.969° · 66.645°

HTM-20 index

335653924