Key parameters at a glance

A radius of 1.79 Earth radii
A mass of 3.86 Earth masses
Surface gravity around 1.20 g
An orbital period of 1.974 days
Semi-major axis 0.0242 AU
Equilibrium temperature 798 K (525 °C)
Distance from Earth 617.38 light-years
Earth Similarity Index 0.358
Travel time at Voyager 1 speed 10,887,450 years
Almost certainly tidally locked to its host star given the close orbit

K2-104 b Planet Profile

Physical Specs

Radius

1.79 R⊕

Radius (Jupiter)

0.160 R♃

Mass

3.86 M⊕

Mass (Jupiter)

0.012 M♃

Density

3.70 g/cm³

Surface Gravity

1.20 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.358

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

#271of 1176

top 23.0%

This planet

1.79R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-376 c 1.79 R⊕ Kepler-272 c 1.79 R⊕ Kepler-204 c 1.79 R⊕

Metric	Earth	K2-104 b	Jupiter
Radius (R⊕)	1.00	1.79	11.21
Mass (M⊕)	1.00	3.86	317.83
Density (g/cm³)	5.51	3.70	1.33
Surface Gravity (g)	1.00	1.20	2.53
Insolation (S⊕)	1.00	62.10	0.037

Star Catalogue Identifiers

TIC

TIC 175194958

Gaia DR2

Gaia DR2 664292459846946560

Gaia DR3

Gaia DR3 664292459846946560

System

K2-104

Percentile among Super-Earth cohort

Radius 1.790 R⊕ · percentile 76 / cohort 1176

Mass 3.860 M⊕ · percentile 70 / cohort 1176

Orbital period 1.97 d · percentile 12 / cohort 1164

Distance 189.29 pc · percentile 24 / cohort 1171

ESI 0.358 · percentile 52 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

1.974 days

Semi-major axis

0.0242 AU

Eccentricity

0.090

Inclination

88.75 °

Year Length

A year here lasts approximately 1.97 Earth days (0.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0242 AU.

Transit Fingerprint

Depth

0.175 %

Duration

1.584 h

Impact parameter b

0.390

Rp / R★

0.034000

Transit midpoint (BJD)

2,457,140.3800

Photometric dip

Transit produces a flux drop of 1,749 ppm lasting ≈ 1.58 h.

Extended Orbital Architecture

Planet / star radius ratio

0.034000

Semi-major axis / stellar radius

10.890

Impact parameter (b)

0.390

Transit mid-time (BJD)

2,457,140.3800

Long. of periastron (ω)

0.00°

Angular separation (arcsec)

0.12800

Eq. Temperature

798K

(525 °C)

Insolation (S⊕)

62.10

Earth = 1.00

Earth Similarity (ESI)

0.358

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Mann et al. 2017

Instrument

Kepler CCD Array

Publication

2017-02

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: K2-104

Spectral Class

M-type red dwarf

Effective Temperature

3,712 K — cooler than the Sun (5,778 K)

Estimated Age

0.79 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.480 R☉

Stellar Mass

0.510 M☉

Metallicity [Fe/H]

0.18

Extended Stellar Properties

Surface gravity (log g)

4.780 dex

Stellar density

5.561 g/cm³

Systemic radial velocity

34.81 km/s

Rotational v·sin i

2.60 km/s

Rotation period

9.30 days

Metallicity ratio

[Fe/H]

Distance

189.29 parsec

Light-years 617.38 ly

V-band magnitude

15.99 mag

Voyager-speed travel 10,887,450 yr

Multi-band Host Photometry — 13 bands

Astrometric Data

Parallax

5.257 mas

Total Proper Motion

36.713 mas/yr

PM Right Ascension

-34.40 mas/yr

PM Declination

-12.82 mas/yr

Galactic Cartesian (pc)

x = -0.600 · y = 0.725 · z = 0.338

Equatorial (J2000)

RA 129.63666° · Dec 19.77372°

Galactic ℓ, b

205.622° · 32.112°

Ecliptic λ, β

126.898° · 1.268°

HTM-20 index

107773096