Key parameters at a glance

A radius of 1.29 Earth radii
A mass of 2.77 Earth masses
Surface gravity around 1.67 g
An orbital period of 1.467 days
Semi-major axis 0.0171 AU
Equilibrium temperature 696 K (423 °C)
Distance from Earth 26.33 light-years
Earth Similarity Index 0.436
Travel time at Voyager 1 speed 464,412 years
Almost certainly tidally locked to its host star given the close orbit

Context from the literature

Gliese 486, also known as Wolf 437 and formally named Gar, is a red dwarf star 26.4 light-years away in the constellation Virgo. It hosts one known exoplanet.

Excerpted from Wikipedia · full article

GJ 486 b Planet Profile

Physical Specs

Radius

1.29 R⊕

Radius (Jupiter)

0.115 R♃

Mass

2.77 M⊕

Mass (Jupiter)

0.009 M♃

Density

6.66 g/cm³

Surface Gravity

1.67 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.436

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Radial Velocity

Facility Calar Alto Observatory

Telescope 3.5 m telescope

Size rank in cohort

Rank by radius

#1111of 1176

top 94.4%

This planet

1.29R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-1945 b 1.29 R⊕ Kepler-1693 b 1.29 R⊕ Kepler-173 b 1.29 R⊕

Metric	Earth	GJ 486 b	Jupiter
Radius (R⊕)	1.00	1.29	11.21
Mass (M⊕)	1.00	2.77	317.83
Density (g/cm³)	5.51	6.66	1.33
Surface Gravity (g)	1.00	1.67	2.53
Insolation (S⊕)	1.00	39.20	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	2.770 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	2.768 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 62452

TIC

TIC 390651552

Gaia DR2

Gaia DR2 3735000631158990976

Gaia DR3

Gaia DR3 3735000631158990976

System

GJ 486

Percentile among Super-Earth cohort

Radius 1.289 R⊕ · percentile 5 / cohort 1176

Mass 2.770 M⊕ · percentile 30 / cohort 1176

Orbital period 1.47 d · percentile 9 / cohort 1164

Distance 8.07 pc · percentile 2 / cohort 1171

ESI 0.436 · percentile 66 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

1.467 days

Semi-major axis

0.0171 AU

Eccentricity

0.001

Inclination

89.39 °

Year Length

A year here lasts approximately 1.47 Earth days (0.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0171 AU.

Transit Fingerprint

Depth

0.139 %

Duration

1.016 h

Impact parameter b

0.120

Rp / R★

0.037244

Transit midpoint (BJD)

2,459,939.0716

Photometric dip

Transit produces a flux drop of 1,387 ppm lasting ≈ 1.02 h.

Extended Orbital Architecture

Planet / star radius ratio

0.037244

Semi-major axis / stellar radius

11.380

Impact parameter (b)

0.120

RV semi-amplitude (K)

3.389 m/s

Transit mid-time (BJD)

2,459,939.0716

Long. of periastron (ω)

14.00°

Angular separation (arcsec)

2.12000

Eq. Temperature

696K

(423 °C)

Insolation (S⊕)

39.20

Earth = 1.00

Earth Similarity (ESI)

0.436

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.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Trifonov et al. 2021

Instrument

CARMENES

Publication

2021-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2021 at Calar Alto Observatory (2 shown).

G 264-012 c · Super-Earth G 264-012 b · Super-Earth

Host System: GJ 486

Spectral Class

M-type red dwarf

Effective Temperature

3,317 K — cooler than the Sun (5,778 K)

Estimated Age

4.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.324 R☉

Stellar Mass

0.312 M☉

Metallicity [Fe/H]

-0.15

Extended Stellar Properties

Surface gravity (log g)

4.911 dex

Stellar density

12.950 g/cm³

Systemic radial velocity

19.11 km/s

Rotational v·sin i

2.00 km/s

Rotation period

130.10 days

Activity index (log R'HK)

-5.461

Metallicity ratio

[Fe/H]

Distance

8.07 parsec

Light-years 26.33 ly

V-band magnitude

11.39 mag

Voyager-speed travel 464,412 yr

Multi-band Host Photometry — 8 bands

Astrometric Data

Parallax

123.821 mas

Total Proper Motion

1,108.463 mas/yr

PM Right Ascension

-1,008.60 mas/yr

PM Declination

-459.80 mas/yr

Galactic Cartesian (pc)

x = -0.964 · y = -0.205 · z = 0.169

Equatorial (J2000)

RA 191.98153° · Dec 9.74942°

Galactic ℓ, b

300.037° · 72.601°

Ecliptic λ, β

187.112° · 13.695°

HTM-20 index

944206463

Observation Record

Photometric series

Transmission spectra

Emission spectra

Archive notes

Wikipedia → Image: Wikimedia Commons · Aladin skyplot - SDSS9 color - SLOAN Digital Sky Survey… · Public domain