Key parameters at a glance

A radius of 12.30 Earth radii
A mass of 4,767.45 Earth masses
Surface gravity around 31.51 g
Semi-major axis 3,500.0000 AU
Equilibrium temperature 2,240 K (1967 °C)
Distance from Earth 458.69 light-years
Earth Similarity Index 0.055
Travel time at Voyager 1 speed 8,088,989 years

USco1556 b Planet Profile

Physical Specs

Radius

12.30 R⊕

Radius (Jupiter)

1.090 R♃

Mass

4,767.45 M⊕

Mass (Jupiter)

15.000 M♃

Density

14.10 g/cm³

Surface Gravity

31.51 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.055

HZ Position Unknown

Controversial No

Discovery

Year 2019

Method Imaging

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1349of 1771

top 76.1%

This planet

12.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HAT-P-13 c 12.30 R⊕ HD 22781 b 12.30 R⊕ CHXR 73 b 12.30 R⊕

Metric	Earth	USco1556 b	Jupiter
Radius (R⊕)	1.00	12.30	11.21
Mass (M⊕)	1.00	4,767.45	317.83
Density (g/cm³)	5.51	14.10	1.33
Surface Gravity (g)	1.00	31.51	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	4,767.450 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 77534376

Gaia DR2

Gaia DR2 6235663460003427200

Gaia DR3

Gaia DR3 6235663460003427200

System

USco1556 A

Percentile among Gas Giant cohort

Radius 12.300 R⊕ · percentile 22 / cohort 1771

Mass 4,767.450 M⊕ · percentile 94 / cohort 1747

Distance 140.64 pc · percentile 43 / cohort 1759

ESI 0.055 · percentile 7 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

3,500.0000 AU

Eccentricity

—

Inclination

— °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

2,240K

(1967 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.055

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Discovery Paper

Primary reference

Chinchilla et al. 2020

Instrument

Multiple Instruments

Publication

2020-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2019 at Multiple Observatories (8 shown).

Gl 49 b · Sub-Neptune GJ 357 c · Super-Earth GJ 357 d · Sub-Neptune HR 5183 b · Gas Giant NSVS 14256825 b · Gas Giant 7 CMa c · Gas Giant HD 213885 c · Neptune-like USco1621 b · Gas Giant

Host System: USco1556 A

Spectral Class

M-type red dwarf

Effective Temperature

3,410 K — cooler than the Sun (5,778 K)

Estimated Age

0.01 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.668 R☉

Stellar Mass

0.330 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.595 dex

Stellar density

3.028 g/cm³

Rotation period

4.67 days

Distance

140.64 parsec

Light-years 458.69 ly

V-band magnitude

15.36 mag

Voyager-speed travel 8,088,989 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

7.083 mas

Total Proper Motion

29.007 mas/yr

PM Right Ascension

-18.45 mas/yr

PM Declination

-22.39 mas/yr

Galactic Cartesian (pc)

x = -0.463 · y = -0.773 · z = -0.433

Equatorial (J2000)

RA 239.10372° · Dec -25.68905°

Galactic ℓ, b

347.104° · 20.916°

Ecliptic λ, β

242.310° · -5.171°

HTM-20 index

-282272274

Similar Worlds

USco CTIO 108 b

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 469.7 ly

Oph 11 b

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 444.1 ly

HIP 81208 C b

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 481.2 ly

2MASS J01033563-5515561 AB b

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 153.9 ly

CHXR 73 b

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 620.9 ly

GJ 676 A c

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 52.3 ly

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