Key parameters at a glance

A radius of 4.72 Earth radii
A mass of 20.00 Earth masses
Surface gravity around 0.90 g
Semi-major axis 0.9400 AU
Distance from Earth 1,647.09 light-years
Earth Similarity Index 0.494
Travel time at Voyager 1 speed 29,046,392 years

Context from the literature

Kojima-1Lb is an exoplanet discovered through the microlensing method. The host star lens was discovered by the amateur astronomer Tadashi Kojima (小嶋正). At the time of its discovery it was the planet around the brightest microlensing host star and consequently around a nearby star, as opposed to most of the microlensing planets, which are usually found around distant and inaccessible host stars. Kojima-1Lb is a mildly cold Neptune around a red dwarf located 429±21 pc from the Solar System.

Excerpted from Wikipedia · full article

TCP J05074264+2447555 b Planet Profile

Physical Specs

Radius

4.72 R⊕

Radius (Jupiter)

0.421 R♃

Mass

20.00 M⊕

Mass (Jupiter)

0.063 M♃

Density

1.05 g/cm³

Surface Gravity

0.90 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.494

HZ Position Unknown

Controversial No

Discovery

Year 2018

Method Microlensing

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#426of 574

top 74.0%

This planet

4.72R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

OGLE-2007-BLG-368L b 4.72 R⊕ LTT 9779 b 4.72 R⊕ Kepler-318 b 4.71 R⊕

Metric	Earth	TCP J05074264+2447555 b	Jupiter
Radius (R⊕)	1.00	4.72	11.21
Mass (M⊕)	1.00	20.00	317.83
Density (g/cm³)	5.51	1.05	1.33
Surface Gravity (g)	1.00	0.90	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	20.000 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 69530840

Gaia DR2

Gaia DR2 3419143444811862912

Gaia DR3

Gaia DR3 3419143444811862912

System

TCP J05074264+2447555

Percentile among Neptune-like cohort

Radius 4.720 R⊕ · percentile 25 / cohort 574

Mass 20.000 M⊕ · percentile 29 / cohort 574

Distance 505.00 pc · percentile 57 / cohort 572

ESI 0.494 · percentile 89 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

0.9400 AU

Eccentricity

—

Inclination

— °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.494

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Nucita et al. 2018

Instrument

Multiple Instruments

Publication

2018-05

Observation locale

Ground

Discovery cohort

Planets confirmed in 2018 at Multiple Observatories (5 shown).

LHS 1140 c · Super-Earth HD 238914 b · Gas Giant TYC 3318-01333-1 b · Gas Giant BD+48 740 b · Gas Giant CoRoT-20 c · Gas Giant

Host System: TCP J05074264+2447555

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,805 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.425 R☉

Stellar Mass

0.586 M☉

Metallicity [Fe/H]

—

Distance

505.00 parsec

Light-years 1,647.09 ly

V-band magnitude

14.24 mag

Voyager-speed travel 29,046,392 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.451 mas

Total Proper Motion

7.333 mas/yr

PM Right Ascension

-0.23 mas/yr

PM Declination

-7.33 mas/yr

Galactic Cartesian (pc)

x = 0.205 · y = 0.884 · z = 0.419

Equatorial (J2000)

RA 76.92800° · Dec 24.79896°

Galactic ℓ, b

178.756° · -9.326°

Ecliptic λ, β

78.141° · 1.896°

HTM-20 index

158236188

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