Key parameters at a glance

A radius of 2.84 Earth radii
A mass of 8.45 Earth masses
Surface gravity around 1.05 g
An orbital period of 16.842 days
Semi-major axis 0.1261 AU
Equilibrium temperature 699 K (426 °C)
Distance from Earth 1,901.30 light-years
Earth Similarity Index 0.345
Travel time at Voyager 1 speed 33,529,429 years

Kepler-1770 b Planet Profile

Physical Specs

Radius

2.84 R⊕

Radius (Jupiter)

0.253 R♃

Mass

8.45 M⊕

Mass (Jupiter)

0.027 M♃

Density

2.02 g/cm³

Surface Gravity

1.05 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.345

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#693of 1978

top 35.0%

This planet

2.84R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-133 c 2.84 R⊕ Kepler-527 b 2.84 R⊕ Kepler-599 b 2.84 R⊕

Metric	Earth	Kepler-1770 b	Jupiter
Radius (R⊕)	1.00	2.84	11.21
Mass (M⊕)	1.00	8.45	317.83
Density (g/cm³)	5.51	2.02	1.33
Surface Gravity (g)	1.00	1.05	2.53
Insolation (S⊕)	1.00	56.43	0.037

Star Catalogue Identifiers

TIC

TIC 268603980

Gaia DR2

Gaia DR2 2075969526254302848

Gaia DR3

Gaia DR3 2075969526254302848

System

Kepler-1770

Percentile among Sub-Neptune cohort

Radius 2.841 R⊕ · percentile 65 / cohort 1978

Mass 8.450 M⊕ · percentile 59 / cohort 1978

Orbital period 16.84 d · percentile 56 / cohort 1946

Distance 582.94 pc · percentile 52 / cohort 1975

ESI 0.345 · percentile 39 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

16.842 days

Semi-major axis

0.1261 AU

Eccentricity

0.000

Inclination

88.95 °

Year Length

A year here lasts approximately 16.84 Earth days (4.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1261 AU.

Transit Fingerprint

Depth

0.088 %

Duration

2.575 h

Impact parameter b

0.030

Rp / R★

0.025390

Transit midpoint (BJD)

2,454,970.9923

Photometric dip

Transit produces a flux drop of 879 ppm lasting ≈ 2.58 h.

Extended Orbital Architecture

Planet / star radius ratio

0.025390

Semi-major axis / stellar radius

51.130

Impact parameter (b)

0.030

Transit mid-time (BJD)

2,454,970.9923

Angular separation (arcsec)

0.21600

Eq. Temperature

699K

(426 °C)

Insolation (S⊕)

56.43

Earth = 1.00

Earth Similarity (ESI)

0.345

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

Valizadegan et al. 2022

Instrument

Kepler CCD Array

Publication

2022-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: Kepler-1770

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,602 K — cooler than the Sun (5,778 K)

Estimated Age

12.30 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.009 R☉

Stellar Mass

0.941 M☉

Metallicity [Fe/H]

0.10

Extended Stellar Properties

Surface gravity (log g)

4.404 dex

Stellar density

3.518 g/cm³

Metallicity ratio

[Fe/H]

Distance

582.94 parsec

Light-years 1,901.30 ly

V-band magnitude

14.42 mag

Voyager-speed travel 33,529,429 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.687 mas

Total Proper Motion

17.441 mas/yr

PM Right Ascension

-5.65 mas/yr

PM Declination

-16.50 mas/yr

Galactic Cartesian (pc)

x = 0.355 · y = -0.634 · z = 0.687

Equatorial (J2000)

RA 299.25029° · Dec 43.41037°

Galactic ℓ, b

78.266° · 7.523°

Ecliptic λ, β

319.033° · 61.961°

HTM-20 index

1824768618