Key parameters at a glance

A radius of 1.02 Earth radii
A mass of 7.50 Earth masses
Surface gravity around 7.28 g
An orbital period of 4.018 days
Semi-major axis 0.0270 AU
Equilibrium temperature 412 K (139 °C)
Distance from Earth 71.16 light-years
Earth Similarity Index 0.601
Travel time at Voyager 1 speed 1,254,931 years
Almost certainly tidally locked to its host star given the close orbit

K2-415 b Planet Profile

Physical Specs

Radius

1.02 R⊕

Radius (Jupiter)

0.091 R♃

Mass

7.50 M⊕

Mass (Jupiter)

0.024 M♃

Density

— g/cm³

Surface Gravity

7.28 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.601

HZ Position Inner

Controversial No

Discovery

Year 2023

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#322of 570

top 56.3%

This planet

1.02R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

K2-136 b 1.01 R⊕ Kepler-1649 b 1.02 R⊕ Kepler-1911 b 1.01 R⊕

Metric	Earth	K2-415 b	Jupiter
Radius (R⊕)	1.00	1.02	11.21
Mass (M⊕)	1.00	7.50	317.83
Density (g/cm³)	5.51	—	1.33
Surface Gravity (g)	1.00	7.28	2.53
Insolation (S⊕)	1.00	4.82	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	7.500 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 323687123

Gaia DR2

Gaia DR2 604215144503584640

Gaia DR3

Gaia DR3 604215144503584640

System

K2-415

Percentile among Rocky Terrestrial cohort

Radius 1.015 R⊕ · percentile 44 / cohort 570

Mass 7.500 M⊕ · percentile 96 / cohort 570

Orbital period 4.02 d · percentile 44 / cohort 567

Distance 21.82 pc · percentile 10 / cohort 566

ESI 0.601 · percentile 78 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

4.018 days

Semi-major axis

0.0270 AU

Eccentricity

—

Inclination

89.32 °

Year Length

A year here lasts approximately 4.02 Earth days (1.1% of a terrestrial year) at a mean orbital distance of 0.0270 AU.

Transit Fingerprint

Depth

0.281 %

Duration

1.120 h

Impact parameter b

0.370

Rp / R★

0.047200

Transit midpoint (BJD)

2,458,100.0712

Photometric dip

Transit produces a flux drop of 2,809 ppm lasting ≈ 1.12 h.

Extended Orbital Architecture

Planet / star radius ratio

0.047200

Semi-major axis / stellar radius

29.630

Impact parameter (b)

0.370

RV semi-amplitude (K)

4.100 m/s

Transit mid-time (BJD)

2,458,100.0712

Angular separation (arcsec)

1.24000

Eq. Temperature

412K

(139 °C)

Insolation (S⊕)

4.82

Earth = 1.00

Earth Similarity (ESI)

0.601

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Hirano et al. 2023

Instrument

Kepler CCD Array

Publication

2023-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2023 at K2 (4 shown).

EPIC 229004835 b · Sub-Neptune K2-2016-BLG-0005L b · Gas Giant K2-416 b · Sub-Neptune K2-417 b · Sub-Neptune

Host System: K2-415

Spectral Class

M-type red dwarf

Effective Temperature

3,173 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.197 R☉

Stellar Mass

0.164 M☉

Metallicity [Fe/H]

-0.13

Extended Stellar Properties

Surface gravity (log g)

5.066 dex

Stellar density

30.300 g/cm³

Systemic radial velocity

22.50 km/s

Rotation period

4.30 days

Metallicity ratio

[Fe/H]

Distance

21.82 parsec

Light-years 71.16 ly

V-band magnitude

15.33 mag

Voyager-speed travel 1,254,931 yr

Multi-band Host Photometry — 13 bands

Astrometric Data

Parallax

45.804 mas

Total Proper Motion

497.317 mas/yr

PM Right Ascension

-458.50 mas/yr

PM Declination

192.63 mas/yr

Galactic Cartesian (pc)

x = -0.718 · y = 0.665 · z = 0.206

Equatorial (J2000)

RA 137.20154° · Dec 11.86225°

Galactic ℓ, b

217.798° · 35.809°

Ecliptic λ, β

136.063° · -4.352°

HTM-20 index

2009918549

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