Key parameters at a glance

A radius of 2.87 Earth radii
A mass of 8.60 Earth masses
Surface gravity around 1.04 g
An orbital period of 59.737 days
Semi-major axis 0.3200 AU
Equilibrium temperature 520 K (247 °C)
Distance from Earth 2,766.63 light-years
Earth Similarity Index 0.454
Travel time at Voyager 1 speed 48,789,541 years

Context from the literature

Kepler-90, also designated 2MASS J18574403+4918185, is an F-type star located about 2,790 light-years (855 pc) from Earth in the constellation of Draco. It is notable for being the only confirmed planetary system with the same number of observed planets as the Solar System.

Excerpted from Wikipedia · full article

7 siblings around KOI-351

KOI-351 d shares its host star with 7 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
KOI-351 b	Super-Earth	1.31	2.27	7.008	1,062	2013
KOI-351 c	Rocky Terrestrial	1.19	1.81	8.719	987	2013
Kepler-90 i	Super-Earth	1.32	2.30	14.449	709	2017
KOI-351 d this	Sub-Neptune	2.87	8.60	59.737	520	2013
KOI-351 e	Sub-Neptune	2.66	7.56	91.939	450	2013
KOI-351 f	Sub-Neptune	2.88	8.65	124.914	407	2013
KOI-351 g	Neptune-like	7.72	15.00	210.735	342	2013
KOI-351 h	Gas Giant	11.25	203.00	331.603	294	2013

KOI-351 d Planet Profile

Physical Specs

Radius

2.87 R⊕

Radius (Jupiter)

0.256 R♃

Mass

8.60 M⊕

Mass (Jupiter)

0.027 M♃

Density

2.00 g/cm³

Surface Gravity

1.04 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.454

HZ Position Inner

Controversial No

Discovery

Year 2013

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#659of 1978

top 33.3%

This planet

2.87R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-297 b 2.87 R⊕ Kepler-880 c 2.87 R⊕ Kepler-11 c 2.87 R⊕

Metric	Earth	KOI-351 d	Jupiter
Radius (R⊕)	1.00	2.87	11.21
Mass (M⊕)	1.00	8.60	317.83
Density (g/cm³)	5.51	2.00	1.33
Surface Gravity (g)	1.00	1.04	2.53
Insolation (S⊕)	1.00	18.17	0.037

Star Catalogue Identifiers

TIC

TIC 267667295

Gaia DR2

Gaia DR2 2132193431285570304

Gaia DR3

Gaia DR3 2132193431285570304

System

KOI-351

Percentile among Sub-Neptune cohort

Radius 2.870 R⊕ · percentile 66 / cohort 1978

Mass 8.600 M⊕ · percentile 61 / cohort 1978

Orbital period 59.74 d · percentile 88 / cohort 1946

Distance 848.25 pc · percentile 69 / cohort 1975

ESI 0.454 · percentile 63 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

59.737 days

Semi-major axis

0.3200 AU

Eccentricity

0.000

Inclination

89.71 °

Year Length

A year here lasts approximately 59.74 Earth days (16.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3200 AU.

Transit Fingerprint

Depth

0.057 %

Duration

8.400 h

Impact parameter b

0.280

Rp / R★

0.021900

Transit midpoint (BJD)

2,454,991.9656

Photometric dip

Transit produces a flux drop of 566 ppm lasting ≈ 8.40 h.

Extended Orbital Architecture

Planet / star radius ratio

0.021900

Semi-major axis / stellar radius

56.100

Impact parameter (b)

0.280

Transit mid-time (BJD)

2,454,991.9656

Angular separation (arcsec)

0.37700

Eq. Temperature

520K

(247 °C)

Insolation (S⊕)

18.17

Earth = 1.00

Earth Similarity (ESI)

0.454

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

Cabrera et al. 2014

Instrument

Kepler CCD Array

Publication

2014-01

Observation locale

Space

Discovery cohort

Planets confirmed in 2013 at Kepler (12 shown).

Kepler-69 c · Super-Earth Kepler-61 b · Sub-Neptune Kepler-62 e · Super-Earth KOI-351 f · Sub-Neptune Kepler-62 f · Super-Earth KOI-351 e · Sub-Neptune Kepler-1704 b · Gas Giant Kepler-37 d · Sub-Neptune Kepler-282 e · Sub-Neptune KOI-351 h · Gas Giant Kepler-114 c · Super-Earth Kepler-396 b · Sub-Neptune

Host System: KOI-351

Spectral Class

F-type yellow-white

Effective Temperature

6,080 K — hotter than the Sun (5,778 K)

Estimated Age

0.53 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.200 R☉

Stellar Mass

1.200 M☉

Metallicity [Fe/H]

-0.12

Extended Stellar Properties

Surface gravity (log g)

4.400 dex

Stellar density

1.189 g/cm³

Rotational v·sin i

4.60 km/s

Metallicity ratio

[M/H]

Distance

848.25 parsec

Light-years 2,766.63 ly

V-band magnitude

13.88 mag

Voyager-speed travel 48,789,541 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.150 mas

Total Proper Motion

5.432 mas/yr

PM Right Ascension

-4.38 mas/yr

PM Declination

-3.21 mas/yr

Galactic Cartesian (pc)

x = 0.163 · y = -0.631 · z = 0.758

Equatorial (J2000)

RA 284.43346° · Dec 49.30512°

Galactic ℓ, b

79.269° · 19.256°

Ecliptic λ, β

300.329° · 71.228°

HTM-20 index

-419849693

Wikipedia → Image: Wikimedia Commons · NASA/Ames Research Center/Wendy Stenzel · Public domain