Key parameters at a glance

A radius of 2.63 Earth radii
A mass of 7.41 Earth masses
Surface gravity around 1.07 g
An orbital period of 18.553 days
Semi-major axis 0.1336 AU
Equilibrium temperature 612 K (339 °C)
Distance from Earth 3,159.54 light-years
Earth Similarity Index 0.404
Travel time at Voyager 1 speed 55,718,572 years

Kepler-1241 b Planet Profile

Physical Specs

Radius

2.63 R⊕

Radius (Jupiter)

0.235 R♃

Mass

7.41 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.24 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.404

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

#969of 1978

top 48.9%

This planet

2.63R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-945 b 2.63 R⊕ GJ 3473 c 2.63 R⊕ Kepler-319 c 2.63 R⊕

Metric	Earth	Kepler-1241 b	Jupiter
Radius (R⊕)	1.00	2.63	11.21
Mass (M⊕)	1.00	7.41	317.83
Density (g/cm³)	5.51	2.24	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	31.46	0.037

Star Catalogue Identifiers

TIC

TIC 378013798

Gaia DR2

Gaia DR2 2052124692458750976

Gaia DR3

Gaia DR3 2052124692458750976

System

Kepler-1241

Percentile among Sub-Neptune cohort

Radius 2.630 R⊕ · percentile 50 / cohort 1978

Mass 7.410 M⊕ · percentile 46 / cohort 1978

Orbital period 18.55 d · percentile 59 / cohort 1946

Distance 968.72 pc · percentile 76 / cohort 1975

ESI 0.404 · percentile 53 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

18.553 days

Semi-major axis

0.1336 AU

Eccentricity

0.000

Inclination

87.94 °

Year Length

A year here lasts approximately 18.55 Earth days (5.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1336 AU.

Transit Fingerprint

Depth

0.077 %

Duration

4.201 h

Impact parameter b

0.780

Rp / R★

0.029903

Transit midpoint (BJD)

2,454,968.5105

Photometric dip

Transit produces a flux drop of 772 ppm lasting ≈ 4.20 h.

Extended Orbital Architecture

Planet / star radius ratio

0.029903

Semi-major axis / stellar radius

21.700

Impact parameter (b)

0.780

Transit mid-time (BJD)

2,454,968.5105

Angular separation (arcsec)

0.13800

Eq. Temperature

612K

(339 °C)

Insolation (S⊕)

31.46

Earth = 1.00

Earth Similarity (ESI)

0.404

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-1241

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,261 K — cooler than the Sun (5,778 K)

Estimated Age

4.68 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.800 R☉

Stellar Mass

0.840 M☉

Metallicity [Fe/H]

-0.09

Extended Stellar Properties

Surface gravity (log g)

4.560 dex

Stellar density

1.479 g/cm³

Metallicity ratio

[Fe/H]

Distance

968.72 parsec

Light-years 3,159.54 ly

V-band magnitude

15.89 mag

Voyager-speed travel 55,718,572 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.005 mas

Total Proper Motion

10.623 mas/yr

PM Right Ascension

-6.00 mas/yr

PM Declination

-8.77 mas/yr

Galactic Cartesian (pc)

x = 0.326 · y = -0.712 · z = 0.622

Equatorial (J2000)

RA 294.57620° · Dec 38.45696°

Galactic ℓ, b

72.162° · 8.167°

Ecliptic λ, β

308.733° · 58.636°

HTM-20 index

-2096070959