Key parameters at a glance

A radius of 1.92 Earth radii
A mass of 4.35 Earth masses
Surface gravity around 1.18 g
An orbital period of 2.573 days
Semi-major axis 0.0392 AU
Equilibrium temperature 1,325 K (1052 °C)
Distance from Earth 1,323.32 light-years
Earth Similarity Index 0.201
Travel time at Voyager 1 speed 23,336,734 years

K2-61 b Planet Profile

Physical Specs

Radius

1.92 R⊕

Radius (Jupiter)

0.171 R♃

Mass

4.35 M⊕

Mass (Jupiter)

0.014 M♃

Density

3.38 g/cm³

Surface Gravity

1.18 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.201

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#102of 1176

top 8.6%

This planet

1.92R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-1119 b 1.92 R⊕ Kepler-1987 e 1.92 R⊕ HD 3167 d 1.92 R⊕

Metric	Earth	K2-61 b	Jupiter
Radius (R⊕)	1.00	1.92	11.21
Mass (M⊕)	1.00	4.35	317.83
Density (g/cm³)	5.51	3.38	1.33
Surface Gravity (g)	1.00	1.18	2.53
Insolation (S⊕)	1.00	730.00	0.037

Star Catalogue Identifiers

TIC

TIC 402314147

Gaia DR2

Gaia DR2 2598309945401588224

Gaia DR3

Gaia DR3 2598309945401588224

System

K2-61

Percentile among Super-Earth cohort

Radius 1.920 R⊕ · percentile 90 / cohort 1176

Mass 4.350 M⊕ · percentile 84 / cohort 1176

Orbital period 2.57 d · percentile 17 / cohort 1164

Distance 405.73 pc · percentile 40 / cohort 1171

ESI 0.201 · percentile 13 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

2.573 days

Semi-major axis

0.0392 AU

Eccentricity

—

Inclination

86.00 °

Year Length

A year here lasts approximately 2.57 Earth days (0.7% of a terrestrial year) at a mean orbital distance of 0.0392 AU.

Transit Fingerprint

Depth

0.036 %

Duration

2.330 h

Impact parameter b

0.300

Rp / R★

0.016600

Transit midpoint (BJD)

2,456,983.2140

Photometric dip

Transit produces a flux drop of 364 ppm lasting ≈ 2.33 h.

Extended Orbital Architecture

Planet / star radius ratio

0.016600

Semi-major axis / stellar radius

6.240

Impact parameter (b)

0.300

Transit mid-time (BJD)

2,456,983.2140

Angular separation (arcsec)

0.09660

Eq. Temperature

1,325K

(1052 °C)

Insolation (S⊕)

730.00

Earth = 1.00

Earth Similarity (ESI)

0.201

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

Discovery Paper

Primary reference

Crossfield et al. 2016

Instrument

Kepler CCD Array

Publication

2016-09

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at K2 (12 shown).

K2-72 d · Rocky Terrestrial K2-72 b · Rocky Terrestrial K2-91 b · Rocky Terrestrial K2-72 c · Rocky Terrestrial K2-102 b · Super-Earth K2-90 c · Super-Earth K2-72 e · Super-Earth K2-83 b · Rocky Terrestrial K2-88 b · Rocky Terrestrial K2-80 c · Super-Earth K2-83 c · Super-Earth K2-65 b · Super-Earth

Host System: K2-61

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,748 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.995 R☉

Stellar Mass

0.970 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

4.380 dex

Stellar density

1.433 g/cm³

Systemic radial velocity

-8.15 km/s

Rotational v·sin i

1.60 km/s

Activity index (log R'HK)

-5.119

Metallicity ratio

[Fe/H]

Distance

405.73 parsec

Light-years 1,323.32 ly

V-band magnitude

13.17 mag

Voyager-speed travel 23,336,734 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

2.437 mas

Total Proper Motion

23.143 mas/yr

PM Right Ascension

22.03 mas/yr

PM Declination

-7.10 mas/yr

Galactic Cartesian (pc)

x = 0.912 · y = -0.338 · z = -0.234

Equatorial (J2000)

RA 339.67484° · Dec -13.56004°

Galactic ℓ, b

49.896° · -56.201°

Ecliptic λ, β

336.143° · -4.635°

HTM-20 index

-105631105