Key parameters at a glance

A radius of 1.84 Earth radii
A mass of 4.04 Earth masses
Surface gravity around 1.19 g
An orbital period of 45.090 days
Semi-major axis 0.2478 AU
Equilibrium temperature 487 K (214 °C)
Distance from Earth 2,942.59 light-years
Earth Similarity Index 0.568
Travel time at Voyager 1 speed 51,892,615 years

Kepler-1251 b Planet Profile

Physical Specs

Radius

1.84 R⊕

Radius (Jupiter)

0.164 R♃

Mass

4.04 M⊕

Mass (Jupiter)

0.013 M♃

Density

3.56 g/cm³

Surface Gravity

1.19 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.568

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

#201of 1176

top 17.0%

This planet

1.84R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-52 c 1.84 R⊕ Kepler-354 b 1.84 R⊕ Kepler-1651 b 1.84 R⊕

Metric	Earth	Kepler-1251 b	Jupiter
Radius (R⊕)	1.00	1.84	11.21
Mass (M⊕)	1.00	4.04	317.83
Density (g/cm³)	5.51	3.56	1.33
Surface Gravity (g)	1.00	1.19	2.53
Insolation (S⊕)	1.00	13.78	0.037

Star Catalogue Identifiers

TIC

TIC 26583618

Gaia DR2

Gaia DR2 2129755779649780224

Gaia DR3

Gaia DR3 2129755779649780224

System

Kepler-1251

Percentile among Super-Earth cohort

Radius 1.840 R⊕ · percentile 82 / cohort 1176

Mass 4.040 M⊕ · percentile 75 / cohort 1176

Orbital period 45.09 d · percentile 95 / cohort 1164

Distance 902.20 pc · percentile 75 / cohort 1171

ESI 0.568 · percentile 79 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

45.090 days

Semi-major axis

0.2478 AU

Eccentricity

0.000

Inclination

88.01 °

Year Length

A year here lasts approximately 45.09 Earth days (12.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2478 AU.

Transit Fingerprint

Depth

0.044 %

Duration

3.905 h

Impact parameter b

0.105

Rp / R★

0.018969

Transit midpoint (BJD)

2,454,966.5596

Photometric dip

Transit produces a flux drop of 436 ppm lasting ≈ 3.91 h.

Extended Orbital Architecture

Planet / star radius ratio

0.018969

Semi-major axis / stellar radius

27.500

Impact parameter (b)

0.105

Transit mid-time (BJD)

2,454,966.5596

Angular separation (arcsec)

0.27500

Eq. Temperature

487K

(214 °C)

Insolation (S⊕)

13.78

Earth = 1.00

Earth Similarity (ESI)

0.568

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-1251

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,545 K — cooler than the Sun (5,778 K)

Estimated Age

4.79 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.890 R☉

Stellar Mass

0.920 M☉

Metallicity [Fe/H]

-0.04

Extended Stellar Properties

Surface gravity (log g)

4.510 dex

Stellar density

6.653 g/cm³

Metallicity ratio

[Fe/H]

Distance

902.20 parsec

Light-years 2,942.59 ly

V-band magnitude

15.02 mag

Voyager-speed travel 51,892,615 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.080 mas

Total Proper Motion

10.127 mas/yr

PM Right Ascension

-3.53 mas/yr

PM Declination

-9.49 mas/yr

Galactic Cartesian (pc)

x = 0.246 · y = -0.605 · z = 0.758

Equatorial (J2000)

RA 292.11511° · Dec 49.25638°

Galactic ℓ, b

81.198° · 14.598°

Ecliptic λ, β

314.115° · 69.331°

HTM-20 index

713978851