Key parameters at a glance

A radius of 9.60 Earth radii
A mass of 66.74 Earth masses
Surface gravity around 0.72 g
An orbital period of 771.360 days
Semi-major axis 0.8800 AU
Distance from Earth 14.58 light-years
Earth Similarity Index 0.314
Travel time at Voyager 1 speed 257,161 years

GJ 9066 c Planet Profile

Physical Specs

Radius

9.60 R⊕

Radius (Jupiter)

0.856 R♃

Mass

66.74 M⊕

Mass (Jupiter)

0.210 M♃

Density

0.42 g/cm³

Surface Gravity

0.72 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.314

HZ Position Unknown

Controversial No

Discovery

Year 2020

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#33of 574

top 5.6%

This planet

9.60R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

KMT-2021-BLG-0240L b 9.60 R⊕ HD 76700 b 9.60 R⊕ HD 107148 b 9.60 R⊕

Metric	Earth	GJ 9066 c	Jupiter
Radius (R⊕)	1.00	9.60	11.21
Mass (M⊕)	1.00	66.74	317.83
Density (g/cm³)	5.51	0.42	1.33
Surface Gravity (g)	1.00	0.72	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	66.744 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 404715018

Gaia DR2

Gaia DR2 76868614540049408

Gaia DR3

Gaia DR3 76868614540049408

System

GJ 9066

Percentile among Neptune-like cohort

Radius 9.600 R⊕ · percentile 94 / cohort 574

Mass 66.744 M⊕ · percentile 83 / cohort 574

Orbital period 771.36 d · percentile 97 / cohort 524

Distance 4.47 pc · percentile 0 / cohort 572

ESI 0.314 · percentile 53 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

771.360 days

Semi-major axis

0.8800 AU

Eccentricity

0.460

Inclination

— °

Year Length

A year here lasts about 2.11 Earth years on a highly eccentric trajectory at a mean orbital distance of 0.8800 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.314

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Feng et al. 2020

Instrument

Multiple Instruments

Publication

2020-10

Observation locale

Ground

Discovery cohort

Planets confirmed in 2020 at Multiple Observatories (12 shown).

GJ 3473 c · Sub-Neptune HIP 38594 b · Sub-Neptune HD 216520 c · Sub-Neptune HD 216520 b · Sub-Neptune HIP 107772 b · Sub-Neptune GJ 480 b · Sub-Neptune HIP 4845 b · Sub-Neptune HD 190007 b · Neptune-like GJ 687 c · Neptune-like GJ 2056 b · Neptune-like HD 238090 b · Sub-Neptune HIP 48714 b · Neptune-like

Host System: GJ 9066

Spectral Class

M-type red dwarf

Effective Temperature

3,154 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.164 R☉

Stellar Mass

0.150 M☉

Metallicity [Fe/H]

-0.13

Extended Stellar Properties

Surface gravity (log g)

5.010 dex

Stellar density

36.041 g/cm³

Systemic radial velocity

-28.83 km/s

Rotational v·sin i

2.00 km/s

Rotation period

1.96 days

Activity index (log R'HK)

-4.790

Metallicity ratio

[Fe/H]

Distance

4.47 parsec

Light-years 14.58 ly

V-band magnitude

12.71 mag

Voyager-speed travel 257,161 yr

Multi-band Host Photometry — 8 bands

Astrometric Data

Parallax

223.635 mas

Total Proper Motion

2,084.581 mas/yr

PM Right Ascension

1,096.56 mas/yr

PM Declination

-1,772.86 mas/yr

Galactic Cartesian (pc)

x = 0.843 · y = 0.488 · z = 0.226

Equatorial (J2000)

RA 30.05883° · Dec 13.04432°

Galactic ℓ, b

147.669° · -46.497°

Ecliptic λ, β

32.511° · 0.744°

HTM-20 index

255159468