Key parameters at a glance

A radius of 3.20 Earth radii
A mass of 10.30 Earth masses
Surface gravity around 1.01 g
An orbital period of 26.020 days
Semi-major axis 0.1680 AU
Equilibrium temperature 675 K (402 °C)
Distance from Earth 4,261.33 light-years
Earth Similarity Index 0.340
Travel time at Voyager 1 speed 75,148,480 years

Kepler-1172 b Planet Profile

Physical Specs

Radius

3.20 R⊕

Radius (Jupiter)

0.285 R♃

Mass

10.30 M⊕

Mass (Jupiter)

0.033 M♃

Density

1.73 g/cm³

Surface Gravity

1.01 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.340

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

#348of 1978

top 17.5%

This planet

3.20R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-170 b 3.20 R⊕ TOI-332 b 3.20 R⊕ Kepler-33 c 3.20 R⊕

Metric	Earth	Kepler-1172 b	Jupiter
Radius (R⊕)	1.00	3.20	11.21
Mass (M⊕)	1.00	10.30	317.83
Density (g/cm³)	5.51	1.73	1.33
Surface Gravity (g)	1.00	1.01	2.53
Insolation (S⊕)	1.00	26.36	0.037

Star Catalogue Identifiers

TIC

TIC 122507231

Gaia DR2

Gaia DR2 2051103314872392192

Gaia DR3

Gaia DR3 2051103314872392192

System

Kepler-1172

Percentile among Sub-Neptune cohort

Radius 3.200 R⊕ · percentile 82 / cohort 1978

Mass 10.300 M⊕ · percentile 75 / cohort 1978

Orbital period 26.02 d · percentile 70 / cohort 1946

Distance 1,306.53 pc · percentile 89 / cohort 1975

ESI 0.340 · percentile 38 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

26.020 days

Semi-major axis

0.1680 AU

Eccentricity

0.000

Inclination

88.67 °

Year Length

A year here lasts approximately 26.02 Earth days (7.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1680 AU.

Transit Fingerprint

Depth

0.116 %

Duration

4.840 h

Impact parameter b

0.870

Rp / R★

0.033203

Transit midpoint (BJD)

2,454,987.5247

Photometric dip

Transit produces a flux drop of 1,164 ppm lasting ≈ 4.84 h.

Extended Orbital Architecture

Planet / star radius ratio

0.033203

Semi-major axis / stellar radius

19.700

Impact parameter (b)

0.870

Transit mid-time (BJD)

2,454,987.5247

Angular separation (arcsec)

0.12900

Eq. Temperature

675K

(402 °C)

Insolation (S⊕)

26.36

Earth = 1.00

Earth Similarity (ESI)

0.340

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-1172

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,558 K — cooler than the Sun (5,778 K)

Estimated Age

4.37 Gyr — younger 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

1.740 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,306.53 parsec

Light-years 4,261.33 ly

V-band magnitude

16.08 mag

Voyager-speed travel 75,148,480 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

0.738 mas

Total Proper Motion

6.706 mas/yr

PM Right Ascension

-5.70 mas/yr

PM Declination

-3.54 mas/yr

Galactic Cartesian (pc)

x = 0.277 · y = -0.741 · z = 0.612

Equatorial (J2000)

RA 290.47449° · Dec 37.76655°

Galactic ℓ, b

70.043° · 10.721°

Ecliptic λ, β

302.388° · 58.925°

HTM-20 index

1817728822